Conveyor Belt Compounds

Georgia Duck’s PVC belting product line utilizes a formulation known as SAR (Special Age Resistant). This particular formulation is designed to resist plasticizer extraction which provides extended life in comparison to ordinary PVC formulations. The standard black compound used in (Cover X Cover) constructions is water resistant, very resistant to petroleum based oils, unaffected by acids, alkalines and other corrosive chemicals. PVC can handle strong oxidizing agents such as potassium permanganate, chromic acid, nitric acid, hydrogen peroxide, sodium perborate, and chlorine. It resists abrasion, is smooth and nonporous, and can be readily formed to a variety of surface textures.

PVC is flame retardant per the current MSHA 2G test and/or ASTM D-378. PVC can be made static conductive to less than 300 Meg-Ohms. It will safely dissipate a static charge on a conveyor or elevator system providing the system is properly grounded.

Solvents such as benzene and toluene extract plasticizer from the PVC formulation, resulting in premature aging. Continued exposure will result in stiffening of the formulation. Solvents such as aldehydes, ketones, and tetrahydrofurans dissolve PVC.

Typically, PVC formulations do not age by oxidation, but by plasticizer extraction over an extended period of time. This “aging” can be accelerated by high temperatures, chemicals such as solvents, vegetable and animal fats, and other extractants.

A “top of the line” premium polymeric coating with exceptional resistance to plasticizer extraction. Resists the effects of vegetable, animal, and mineral fats, oils, and chemicals to a remarkable degree. Available on request on most belting styles. Food grade SOR fully meets USDA and FDA requirements. Approved for direct food contact up to 212 degrees Fahrenheit. Standard on “heavy cover/heavy duty” food belt.

Our cold duck is a specially formulated PVC compound designed to provide excellent flexibility at very low temperatures. It is designed for operation in minus 30 degrees Fahrenheit to plus 212 degrees Fahrenheit. This belt has very low oil resistance.

Urethane offers excellent physical properties, superior abrasion resistance, and excellent oil and solvent resistance. It is a superior product for rough applications.

Urethane is a costly polymer and frequently loses out in terms of cost per unit function. Some urethanes can hydrolize under certain specific conditions which involve high humidity and elevated temperatures. When hydrolized, durometer and strength are compromised.

Rubbers

The broad family of rubbers (including natural and synthetic) offers physical properties somewhat similar to those offered by the broad family of PVC formulations. However, they do offer significantly greater resiliency. This can be quite important in handling material like gravel or rocks, etc. Accordingly, while we would think of a PVC formulation as being appropriate for handling soft minerals we would think in terms of rubber for the broad mineral spectrum including hard rock.

Natural rubber (polyisoprene) offers an excellent balance of properties which result in outstanding performance in many demanding mechanical applications. It offers high resilience, high tensile strength, and excellent flexibility at low temperatures. When properly compounded with appropriate additives, natural gum can exhibit excellent abrasion/wear resistance, and good oxygen, ozone and sunlight resistance. It does have drawbacks however: ‘ such as: lack of oil resistance, and poor heat aging characteristics.

Natural gum is recommended for those applications requiring superior resistance to cutting, gouging, and abrasion. It is particularly effective for use when conveying heavy logs, hard rock ores, glass cullet, trap and other sharp, abrasive materials.

SBR (styrene butadiene rubber) is a polymer which has been the general purpose rubber of the belting industry for many years. it is recommended for the majority of above ground applications, including aggregate, log handling from the wood yard to debarkers, run of mine and sized coal, coal mine refuse, crushed ores, phosphate, potash, salt, sand, crushed materials and general mining applications.

It is a tough rugged, compound which ideally meets the demands of the mining industry. However, it does have a limitation of poor oil resistance but is compounded for medium heat resistance and good oxygen, ozone and sunlight resistance.

This is basically a SBR rubber which has been formulated to be flame retardant. MSHA-FR is designed for service in coal, potash, salt and other underground mining where fire resistant belts are mandatory. It meets the fire resistant standards of the US Department of Labor, Mine Safety and Health Administration-Standard 2G and ASTM 0-378.

Same as above but compounded to be sunlight and ozone resistant. Will retain flexibility at the lower temperatures anticipated in above ground applications.

A premium formulation which will meet the current flame retardant requirements and which will provide oil resistance for applications like oil treated coal in power plants. It is ideal for above ground coal preparation plants, coal fired steam plants, etc.

A premium formulation designed to provide moderate oil resistance. It will withstand attack in moderate oil environments such as wood chips, oil treated coal, and whole grains like corn and soybeans.

SOR (special oil resistant) is a premium formulation made especially for applications requiring extreme oil resistance. It has excellent abrasion, tear, ozone, and water resistance and is highly resistant to mineral oil and most other oils that cause swelling and sponginess in other elastomers. SOR is recommended for handling oily metal parts, crushed soybeans, and other materials where animal or vegetable fats are a deteriorating factor.

Rubbers continued

Classic Grain Handler is a specially formulated rubber which has been specifically engineered for handling grain products including wheat, corn, whole soybeans, cotton seed, flax seed, and sunflower seeds. When exposed to oily grains, CGH will not soften, peel, or flake. CGH is fire resistant (per MSHA-2G and ASTM 0- 378), as well as moderately oil resistant and static conductive. Electrical resistance is less than 1 megohm – exceeds RMA standards substantially.

A premium compound designed to convey oil treated grain, crushed soybeans and other materials where mineral, animal or vegetable fat are a deteriorating factor and where combustion properties are a concern. UGH also meets MSHA 2-G and ASTM D-378 flame retardant requirements and OSHA requirements.

EPDM (ethylene propylene diene methylene tripolymar) blend offers excellent resistance to the effects of high-temperature payloads and abrasive materials in a range up to 350 degrees Fahrenheit. Resists hardening and cracking, and is oxygen, ozone and sunlight resistant.

EPDM (ethylene propylene diene methylene tripolymer) offers excellent resistance to the effects of high-temperature payloads and abrasive materials in a range up to 350 degrees Fahrenheit (fines) and 400 degrees Fahrenheit (lumps). Excellent resistance to hardening and cracking within its recommended temperature service range is offered. It is highly chemical, oxygen, ozone and sunlight resistant.

OHR is an oil and heat resistant compound designed to service applications or combinations of high temperature and oil. It has good abrasion resistance and retains flexibility at temperatures to 350 degrees Fahrenheit. This compound is recommended for conveying hot asphalt, paving mix, carbon/pitch mixes, and any hot service involving petroleum oils. It is ideally suited for applications in oil extractors and other plants handling oily grains and seeds where the belt must withstand the effects of vegetable oils at high temperatures as well as moisture from steam.

Nitrile (Butadiene Acrylonitrile) is a copolymer recommended for applications requiring excellent resistance to petroleum oils, mineral oils, and vegetable oils. Nitrile’s resistance to the more aromatic distillants of petroleums is better than neoprene, but it offers relatively poor resistance to the swelling action of oxygenated solvents such as acetone, and ketones. It resists acids and bases with the exception of those having strong oxidizing effects. Resistance to heat aging is good.

Nitrile is frequently compounded with other polymers such as PVC. It does well in food belt applications.

Neoprene has good all around properties. It is a tough elastomer with good aging characteristics, chemical resistance, good ozone resistance, good sunlight resistance, good resistance to oxidation, and is highly resilient. Certain compounds of Neoprene are flame retardant and will not support combustion – per current MSHA requirements

Butyl has outstanding dielectric properties, good resistance to tearing, good aging properties at elevated temperatures (to 350° Fahrenheit), and good chemical stability. Butyl resists weathering, sunlight, ozone, mineral acids, ketones, alcohols, water absorption, and animal and vegetable oils. However, butyl rubber has low resilience.

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