Forklift Ramp Slope Calculator


Forklift Ramp Slope Calculator

A software designed to find out the suitable incline for a powered industrial truck entry ramp facilitates protected materials dealing with. As an illustration, getting into or exiting a loading dock or traversing modifications in elevation requires cautious consideration of incline to forestall tipovers or lack of management. This digital software sometimes requires inputting values corresponding to the peak differential and desired ramp size, then calculates the ensuing slope, typically expressed as a share or ratio.

Correct incline calculation is essential for office security and operational effectivity. Steep ramps pose important dangers, whereas overly gradual inclines can devour beneficial area and hinder productiveness. Traditionally, figuring out appropriate inclines concerned guide calculations and referencing engineering tables. Digital instruments streamline this course of, lowering errors and making certain compliance with security laws corresponding to these offered by OSHA. This contributes to a safer work atmosphere and reduces the potential for accidents and tools injury.

The following sections will delve into the sensible utility of those digital instruments, talk about components influencing ramp design, and discover related security requirements in higher element. This consists of exploring totally different ramp supplies and their affect on incline calculations, in addition to offering sensible suggestions for protected ramp utilization.

1. Security

Secure operation of forklifts on ramps is paramount, necessitating cautious consideration of incline. A devoted slope calculation software performs an important position in mitigating dangers related to improper ramp design and utilization, straight impacting operator well-being and stopping accidents.

  • Tip-Over Prevention

    Extreme incline considerably will increase the danger of tipovers, particularly when carrying masses. Calculating the suitable slope minimizes this threat by making certain the forklift’s middle of gravity stays inside a protected working vary, even throughout ascent or descent. As an illustration, a steeper incline necessitates a slower strategy and extra cautious load dealing with.

  • Managed Ascent/Descent

    Correct slope ensures managed motion on the ramp. A calculated incline permits operators to take care of a protected pace and minimizes the danger of dropping management, particularly when navigating loaded forklifts. That is essential for stopping accidents throughout loading and unloading operations.

  • Load Safety

    Ramp incline straight impacts load safety. Incorrect slopes may cause shifting or dislodging of supplies, resulting in potential injury or harm. A correctly calculated incline, along with acceptable load securing methods, safeguards towards such incidents. For instance, masses on pallets may shift on an excessively steep incline, even with correct wrapping or banding.

  • Floor Traction

    The interaction between ramp floor and incline influences traction. A calculated slope, contemplating the ramp materials (e.g., metal, concrete, wooden), ensures adequate grip for the forklifts tires, lowering the danger of slippage. That is notably necessary in moist or icy circumstances the place diminished traction considerably amplifies dangers.

These sides of security are inextricably linked to using a slope calculation software. Using such a software is important for figuring out a protected incline, which minimizes tip-over dangers, promotes managed ascent and descent, ensures load safety, and accounts for floor traction necessities. This complete strategy to ramp design contributes considerably to a safer and extra environment friendly materials dealing with atmosphere.

2. Slope Calculation

Correct slope calculation is prime to protected and environment friendly forklift ramp design. A devoted calculation software gives a scientific strategy to figuring out the suitable incline, making certain compliance with security laws and optimizing operational effectiveness.

  • Rise and Run

    Slope is set by the ratio of vertical rise (peak distinction between the ramp’s starting and finish) to horizontal run (the ramp’s size). For instance, a 4-foot rise over a 20-foot run leads to a 20% slope (4/20 = 0.20). Understanding this elementary precept is essential for using a devoted slope calculation software successfully.

  • Angle of Incline

    The calculated slope may also be expressed as an angle. This angle, derived from the rise and run, gives another illustration of the ramp’s steepness. Whereas share slope is often utilized in sensible purposes, understanding the angular illustration may be helpful for sure design concerns.

  • Affect of Load

    Load weight and distribution have an effect on the forklift’s stability on an incline. A devoted slope calculation software components in load concerns, making certain the chosen incline stays protected for numerous loading situations. A heavier load requires a extra gradual incline to forestall tip-overs or lack of management.

  • Impression on Forklift Efficiency

    Slope straight influences forklift efficiency, notably acceleration and braking capabilities. A calculated slope optimizes these facets, making certain protected and environment friendly maneuvering on the ramp. Steeper inclines scale back acceleration and necessitate higher braking distances.

These sides of slope calculation underscore the significance of utilizing a devoted software. By precisely figuring out the rise and run, understanding the angle of incline, and contemplating the affect of load and its affect on forklift efficiency, such a software ensures ramp designs prioritize security and operational effectivity. This complete strategy to slope calculation types the cornerstone of efficient ramp design and contributes considerably to protected materials dealing with practices.

3. Load stability

Load stability is paramount when working forklifts on inclines. A devoted ramp slope calculator considers load traits as a essential consider figuring out a protected incline. This connection between load stability and slope calculation is important for stopping accidents and making certain environment friendly materials dealing with. An unstable load on an incline can shift, probably inflicting the forklift to tip over or the load to fall, leading to injury, harm, or fatalities. For instance, a load of cylindrical objects, susceptible to rolling, requires a shallower incline than a uniformly stacked pallet of bins. The calculator facilitates knowledgeable selections about ramp design and cargo securing strategies to reinforce stability.

A number of components affect load stability on a ramp. These embrace the load’s weight, distribution, form, and securing technique. Heavier masses require extra gradual inclines to take care of stability. Erratically distributed masses can shift the forklift’s middle of gravity, rising the danger of tipovers. Masses with irregular shapes or unsecured supplies pose further stability challenges. Devoted slope calculators take into account these variables, enabling customers to find out a protected incline that mitigates these dangers. For instance, a load secured with straps could also be extra steady on a steeper incline than an unsecured load, even when the weights are equivalent. This highlights the sensible significance of utilizing a calculator to account for load-specific components.

Making certain load stability by means of correct slope calculation is a cornerstone of protected forklift operations. It straight impacts operator security, prevents load injury, and maintains operational effectivity. Integrating load concerns into ramp design, facilitated by devoted calculators, minimizes dangers and contributes to a safer work atmosphere. Ignoring load stability can result in expensive accidents and operational disruptions. Understanding the interaction between load traits and ramp incline empowers knowledgeable decision-making for improved security and productiveness in materials dealing with.

4. Ramp Materials

Ramp materials considerably influences the effectiveness and security of forklift operations, straight impacting the calculations carried out by a devoted slope calculator. The fabric’s properties have an effect on traction, load stability, and total ramp integrity, making materials choice an important consider ramp design. Ignoring the affect of ramp materials can compromise security and operational effectivity.

  • Floor Traction

    The ramp’s floor texture straight impacts tire grip. Metal ramps provide excessive traction underneath preferrred circumstances however can grow to be slippery when moist or icy. Concrete gives good traction in most circumstances however requires correct drainage to forestall water accumulation. Wooden, whereas providing respectable preliminary traction, can deteriorate over time, lowering grip and rising the danger of slippage. A slope calculator should account for these variations to make sure protected incline calculations for particular supplies. For instance, a steeper incline may be acceptable for a textured metal ramp in comparison with a easy concrete floor.

  • Sturdiness and Upkeep

    Materials sturdiness impacts the ramp’s lifespan and upkeep necessities. Metal ramps are extremely sturdy however vulnerable to rust. Concrete presents glorious longevity with minimal upkeep. Wooden, whereas much less sturdy, may be simply repaired or changed. These components affect long-term operational prices and security. Selecting a sturdy materials and incorporating its properties into slope calculations ensures long-term security and minimizes operational disruptions.

  • Environmental Components

    Environmental circumstances, like rain, snow, or excessive temperatures, affect materials efficiency. Metal ramps grow to be hazardous in icy circumstances. Concrete presents higher efficiency in antagonistic climate however requires correct sealing to forestall cracking from freeze-thaw cycles. Wooden is vulnerable to warping and rotting in humid environments. Slope calculations should take into account these environmental components to make sure year-round security and operational effectiveness. For instance, a ramp designed for snowy circumstances may require a gentler slope and a distinct materials than one meant for a dry local weather.

  • Interplay with Tires

    Totally different ramp supplies work together otherwise with forklift tires. Metal’s easy floor presents minimal rolling resistance, impacting acceleration and braking distances. Concrete’s barely rougher texture gives extra resistance. Wooden’s variable floor, relying on its situation, can provide important rolling resistance. These components affect the forklift’s capacity to take care of management on the ramp, particularly when carrying heavy masses. Accounting for tire interplay with the ramp materials inside slope calculations ensures protected and predictable forklift maneuverability.

These sides spotlight the integral relationship between ramp materials and slope calculation. Materials properties straight affect traction, sturdiness, environmental efficiency, and interplay with forklift tires. Utilizing a devoted slope calculator that considers these components ensures a protected and environment friendly ramp design tailor-made to particular operational necessities. Neglecting the affect of ramp materials can compromise security and improve the danger of accidents, emphasizing the significance of integrating materials concerns into the ramp design course of.

5. Forklift Specs

Forklift specs are essential inputs for correct ramp slope calculations. These specs straight affect the car’s stability, maneuverability, and load-carrying capability on inclines. Ignoring these parameters can result in unsafe ramp designs, rising the danger of accidents. A correct slope calculation considers these specs to make sure protected and environment friendly forklift operation.

  • Middle of Gravity

    A forklift’s middle of gravity, influenced by its weight distribution and cargo, considerably impacts its stability on a ramp. Larger facilities of gravity improve tip-over susceptibility, particularly on steeper inclines. For instance, a forklift carrying a excessive load has the next middle of gravity than one carrying a low load, requiring a shallower ramp incline for protected operation. Correct slope calculations should account for the forklift’s middle of gravity underneath numerous loading circumstances. A devoted ramp calculator integrates this issue to make sure stability on the designed incline.

  • Wheelbase and Monitor Width

    The forklift’s wheelbase (distance between entrance and rear axles) and monitor width (distance between the left and proper wheels) have an effect on its stability and turning radius. An extended wheelbase typically gives higher stability on inclines, whereas a wider monitor width enhances resistance to sideways tipping. These dimensions are important inputs for slope calculations, making certain the ramp design accommodates protected maneuvering. For instance, a narrow-track forklift requires a shallower incline to forestall tipping throughout turns in comparison with a wider-track mannequin. A ramp calculator incorporates these dimensions to make sure protected turning and maneuvering on the incline.

  • Floor Clearance

    Floor clearance, the gap between the forklift’s lowest level and the bottom, is essential when navigating ramps, particularly on the transition factors. Inadequate floor clearance can result in the forklift bottoming out, inflicting injury or lack of management. Slope calculations should take into account floor clearance to make sure the ramp’s transition angles are navigable with out interference. For instance, a forklift with low floor clearance requires a smoother transition onto the ramp to forestall scraping. Correct ramp calculators incorporate floor clearance to keep away from potential obstructions and guarantee protected entry.

  • Tire Dimension and Kind

    Tire measurement and sort have an effect on traction and load-bearing capability. Bigger tires typically present higher grip, whereas particular tire compounds (e.g., pneumatic, strong) affect efficiency on totally different ramp surfaces. Slope calculators take into account these components to find out a protected incline that maximizes traction and prevents slippage. As an illustration, pneumatic tires provide higher grip on uneven surfaces in comparison with strong tires, probably permitting for barely steeper inclines relying on the ramp materials. A well-designed ramp calculator accounts for tire specs to optimize traction and guarantee protected operation on the incline.

These forklift specs are integral to correct ramp slope calculation. Middle of gravity, wheelbase, monitor width, floor clearance, and tire traits straight affect stability and maneuverability on inclines. Integrating these specs into the calculations, typically facilitated by devoted software program or on-line instruments, ensures ramp designs prioritize security and operational effectivity. Ignoring these components can compromise security and improve the danger of accidents, underscoring the significance of contemplating forklift specs in ramp design.

6. Regulatory Compliance (OSHA)

Adherence to Occupational Security and Well being Administration (OSHA) laws is paramount in forklift ramp design and operation. OSHA requirements, notably 1910.178 “Powered industrial vehicles,” present particular pointers for ramp building and utilization, straight influencing the parameters utilized in slope calculations. These laws set up necessities for ramp incline, load capability, floor circumstances, and different essential security facets. A forklift ramp slope calculator serves as an important software for making certain compliance with these requirements, mitigating office hazards and selling operator security. Non-compliance can lead to penalties, operational disruptions, and, most significantly, accidents.

OSHA mandates particular slope limitations for forklift ramps to forestall tipovers and guarantee protected ascent and descent. Whereas particular necessities might range based mostly on the appliance, basic pointers stipulate most inclines, sometimes expressed as a share or ratio. Exceeding these limits will increase the danger of incidents. A devoted slope calculator incorporates these regulatory constraints, making certain designs stay inside OSHA’s permissible vary. For instance, OSHA might stipulate a most incline of 15% for sure forklift operations. A calculator helps make sure the designed ramp adheres to this restrict, lowering the danger of non-compliance and related penalties. Moreover, OSHA requirements tackle ramp floor circumstances, corresponding to requiring enough traction to forestall slippage. A slope calculator, contemplating these necessities, helps decide a protected incline based mostly on the chosen ramp materials. As an illustration, a metal ramp, although providing excessive traction underneath dry circumstances, may necessitate a shallower incline in moist or icy environments to take care of OSHA compliance.

Integrating OSHA compliance into ramp design, facilitated by a devoted slope calculator, is important for making a protected work atmosphere. This proactive strategy minimizes the danger of accidents, protects workers, and avoids potential penalties related to non-compliance. Utilizing a slope calculator that includes OSHA pointers ensures ramp designs meet regulatory necessities, contributing to a safer and extra compliant office. This understanding underscores the significance of regulatory compliance as a elementary part of efficient ramp design and protected forklift operation.

7. On-line Instruments

On-line instruments provide readily accessible sources for calculating protected and compliant forklift ramp slopes. These digital platforms streamline the design course of, lowering reliance on guide calculations and selling adherence to security laws. Accessibility to those instruments empowers customers with various technical experience to design ramps that prioritize protected and environment friendly materials dealing with. Their widespread availability contributes considerably to enhanced office security and operational effectiveness.

  • Automated Calculation

    On-line calculators automate the method of figuring out the suitable ramp slope. Customers enter parameters such because the vertical rise, desired ramp size, and, in some instances, forklift specs. The software then mechanically calculates the ensuing slope, typically expressed as a share or ratio. This automation minimizes the danger of calculation errors related to guide strategies, making certain higher accuracy and reliability in ramp design.

  • Compliance Integration

    Many on-line instruments combine related security laws, corresponding to these stipulated by OSHA, into their calculations. This characteristic ensures the calculated slope adheres to prescribed security limits, minimizing the danger of non-compliance. As an illustration, a calculator may mechanically modify the utmost permissible slope based mostly on the desired load capability or forklift sort, aligning the design with relevant laws. This integration simplifies the compliance course of and promotes adherence to established security requirements.

  • Visualization and Design Aids

    Some on-line instruments present visible aids, corresponding to diagrams or 3D fashions, to signify the calculated ramp design. This visualization enhances understanding of the ramp’s dimensions and permits customers to evaluate its practicality inside a given operational context. For instance, a visible illustration can spotlight potential clearance points or display the ramp’s integration with current infrastructure. These visible aids improve the design course of and facilitate knowledgeable decision-making.

  • Accessibility and Ease of Use

    On-line instruments provide widespread accessibility, eliminating the necessity for specialised software program or in depth technical experience. Their user-friendly interfaces simplify the calculation course of, empowering a broader vary of customers to design protected and compliant ramps. This accessibility promotes wider adoption of protected ramp design practices and contributes to a safer work atmosphere throughout numerous industries. For instance, a small enterprise proprietor can simply make the most of an internet calculator to design a protected ramp for loading dock entry with out requiring superior engineering data.

These sides of on-line instruments display their worth within the context of forklift ramp design. By automating calculations, integrating security laws, offering visible aids, and providing widespread accessibility, these instruments empower customers to design ramps that prioritize security and effectivity. This available useful resource contributes considerably to improved materials dealing with practices and a discount in office accidents associated to improper ramp design.

8. Sensible Software

Making use of calculated ramp slopes interprets theoretical design into real-world performance. This sensible utility bridges the hole between numerical calculations and the bodily building and utilization of forklift ramps. Making certain a easy transition from design to implementation is essential for maximizing security and operational effectivity. This part explores the sensible facets of implementing calculated slopes, emphasizing the connection between design and real-world utilization.

  • Web site-Particular Concerns

    Sensible utility necessitates adapting the calculated slope to the precise web site circumstances. Components corresponding to obtainable area, current infrastructure, and environmental circumstances affect the ultimate ramp design. For instance, restricted area may necessitate a steeper incline than initially calculated, requiring further security measures like enhanced traction surfaces or stricter pace limits. Adapting the design to the positioning ensures practicality and maintains security requirements. A building web site with uneven terrain may require changes to the ramp’s basis to make sure stability and keep the calculated slope.

  • Materials Choice and Development

    Selecting acceptable ramp supplies and building strategies straight impacts the sensible implementation of the calculated slope. Materials properties have an effect on traction, sturdiness, and upkeep necessities. For instance, a concrete ramp presents long-term sturdiness however requires a extra complicated building course of in comparison with a metal ramp. The chosen materials and building technique should align with the calculated slope to make sure structural integrity and long-term performance. A metal ramp may be extra appropriate for a brief utility, whereas a concrete ramp can be preferable for everlasting installations.

  • Operational Integration and Coaching

    Integrating the constructed ramp into every day operations requires clear pointers and operator coaching. Operators should perceive the ramp’s limitations, together with its most load capability and protected working procedures. Sensible utility includes establishing protocols for ramp utilization, together with pace limits, load securing procedures, and upkeep schedules. This ensures the ramp’s protected and efficient utilization inside the operational workflow. For instance, operators ought to obtain coaching on navigating the ramp with totally different load sorts and underneath numerous climate circumstances.

  • Ongoing Monitoring and Upkeep

    Steady monitoring and common upkeep are important for making certain long-term ramp security and performance. Sensible utility includes inspecting the ramp for indicators of wear and tear and tear, addressing any injury promptly, and making certain its structural integrity. Common upkeep, corresponding to cleansing the ramp floor and addressing drainage points, contributes to sustaining optimum traction and stopping accidents. Monitoring the ramp’s situation over time ensures it continues to satisfy security requirements and stays appropriate for its meant goal. As an illustration, common inspections may determine cracks in a concrete ramp, permitting for well timed repairs and stopping additional deterioration.

These sensible utility facets display the significance of bridging the hole between theoretical calculations and real-world implementation. Contemplating site-specific components, choosing acceptable supplies, integrating the ramp into operations, and implementing ongoing upkeep ensures the calculated slope interprets right into a protected and practical forklift ramp. This complete strategy optimizes materials dealing with processes and minimizes the danger of accidents, highlighting the sensible significance of correct slope calculation in real-world situations.

Regularly Requested Questions

This part addresses widespread inquiries relating to forklift ramp slope calculations, offering readability on key ideas and sensible concerns.

Query 1: What’s the most permissible slope for a forklift ramp?

The utmost allowable slope is dependent upon a number of components, together with the kind of forklift, the load being carried, and the ramp’s floor materials. Laws, corresponding to these offered by OSHA, sometimes stipulate most inclines. Consulting these laws and using a devoted slope calculator ensures compliance and protected operation. A standard guideline suggests a most slope of 15% for some purposes, however particular circumstances may necessitate shallower inclines.

Query 2: How does load weight affect ramp slope calculations?

Heavier masses shift a forklift’s middle of gravity, rising the danger of tipovers on steeper inclines. Subsequently, heavier masses typically require shallower ramp slopes to take care of stability. A devoted slope calculator considers load weight as a essential parameter in figuring out a protected incline.

Query 3: Why is ramp materials necessary in slope calculations?

Ramp materials impacts floor traction, a essential issue influencing forklift stability. Totally different supplies provide various levels of grip, particularly underneath moist or icy circumstances. Slope calculations should account for the chosen ramp materials to make sure enough traction and stop slippage. For instance, a metal ramp may require a shallower incline than a concrete ramp on account of potential traction variations.

Query 4: Can on-line calculators precisely decide a protected ramp slope?

Respected on-line calculators, notably these integrating related security laws, can precisely decide protected ramp slopes. These instruments make the most of established engineering ideas and take into account essential components corresponding to rise, run, load weight, and forklift specs. Nevertheless, it is essential to make sure the calculator aligns with relevant security requirements and incorporates site-specific concerns for correct and dependable outcomes.

Query 5: What are the potential penalties of exceeding the utmost permissible ramp slope?

Exceeding the utmost permissible slope considerably will increase the danger of forklift tipovers, probably resulting in critical accidents, accidents, or fatalities. Moreover, non-compliance with security laws can lead to penalties and operational disruptions. Adhering to prescribed slope limitations is important for sustaining a protected work atmosphere.

Query 6: How does common ramp upkeep contribute to security?

Common upkeep ensures the ramp’s structural integrity and maintains optimum floor circumstances. Addressing points like cracks, particles, or drainage issues helps protect traction and prevents potential hazards that would compromise forklift stability. Ongoing upkeep is essential for making certain the ramp’s long-term security and performance.

Understanding these key facets of ramp slope calculation contributes considerably to protected and environment friendly forklift operations. Prioritizing security by means of correct calculations, acceptable materials choice, and adherence to laws ensures a safe work atmosphere and minimizes the danger of accidents.

The next part delves additional into greatest practices for forklift ramp design and utilization, providing sensible steering for implementing protected and environment friendly materials dealing with procedures.

Sensible Suggestions for Secure Ramp Operation

Implementing calculated ramp slopes requires cautious consideration of varied components to make sure protected and environment friendly forklift operation. The next suggestions present sensible steering for translating calculated slopes into protected materials dealing with practices.

Tip 1: Confirm Calculations with a Dependable Software: All the time confirm slope calculations utilizing a good calculator, ideally one that includes related security laws. This ensures accuracy and minimizes the danger of errors that would compromise security.

Tip 2: Prioritize Correct Ramp Development: Make sure the ramp’s building adheres to the calculated slope and makes use of acceptable supplies for enough traction and structural integrity. Correct building interprets the calculated slope right into a protected and practical bodily construction. For instance, make sure the ramp’s floor is stage and freed from obstructions.

Tip 3: Account for Load Traits: Think about load weight, distribution, and form when figuring out a protected ramp slope. Heavier or inconsistently distributed masses require shallower inclines to take care of forklift stability. As an illustration, a load of cylindrical objects may necessitate a gentler slope than a uniformly stacked pallet.

Tip 4: Prepare Operators on Secure Ramp Procedures: Complete operator coaching on ramp utilization is important. Coaching ought to embody protected speeds, load dealing with methods, and procedures for navigating inclines. Effectively-trained operators contribute considerably to protected and environment friendly ramp operation. For instance, operators ought to be skilled to strategy ramps slowly and keep away from sudden braking or acceleration.

Tip 5: Implement Common Ramp Inspections: Common inspections determine potential hazards, corresponding to floor injury, particles, or drainage points, that would compromise security. Addressing these points promptly maintains the ramp’s integrity and ensures continued protected operation. Documentation of inspections aids in monitoring upkeep and figuring out recurring issues.

Tip 6: Alter Operations for Various Circumstances: Environmental components, corresponding to rain or snow, can considerably have an effect on ramp traction. Alter operational procedures, corresponding to lowering speeds or implementing further security measures, to account for these altering circumstances. Flexibility in operational practices enhances security in antagonistic climate.

Tip 7: Seek the advice of Security Laws and Tips: Keep knowledgeable about related security laws, like these from OSHA, and business greatest practices for forklift ramp operation. Adherence to those pointers ensures compliance and minimizes dangers. Often reviewing up to date laws ensures continued adherence to security requirements.

Implementing these sensible suggestions ensures calculated ramp slopes translate into protected and environment friendly materials dealing with practices. Prioritizing security, offering operator coaching, and sustaining ramp integrity contribute considerably to a safe work atmosphere and decrease the danger of accidents.

This complete strategy to ramp design and operation, incorporating correct calculations and sensible concerns, fosters a tradition of security and effectivity in materials dealing with. The following conclusion summarizes the important thing takeaways and emphasizes the significance of correct ramp administration.

Conclusion

Correct ramp design is essential for protected and environment friendly forklift operation. An appropriate incline, decided by means of correct calculations facilitated by devoted instruments, minimizes dangers related to tipovers and lack of management. Essential components influencing calculations embrace load weight, forklift specs, ramp materials, and adherence to regulatory requirements corresponding to these mandated by OSHA. Integrating these components into the design course of, aided by available on-line instruments, ensures ramps meet security necessities and optimize materials dealing with operations.

Prioritizing ramp security by means of diligent design and operational practices stays paramount for safeguarding personnel and making certain environment friendly workflow. Ongoing analysis of ramp circumstances, coupled with adherence to established security protocols, strengthens office security tradition and minimizes the potential for accidents. Investing in correct ramp design and implementation fosters a safer and extra productive materials dealing with atmosphere.