ASTM D 378 : 2024

1.1.1Heavy Duty Conveyor—A heavy duty belt is defined as belting designed for bulk haulage of materials, such as stone, crushed rock, sand, metals ores, coal, wood chips, etc., and has a carcass strength (design) substantial enough to withstand conveyor system tensions of 160 PIW and above.

1.1.2Light Duty Conveyor—A light duty belt is defined as belting designed for conveying a variety of lower weight materials, packages, industrial and electronic goods, and food products. These belts often are shorter in length and width, with less overall thickness than heavy duty belting, and are generally used in conveyor systems with tensions less than 160 PIW.

1.1.3General Description—Belting can have elastomeric coverings on one side, both sides, or neither side depending upon the specific application requirements. Belt coverings are comprised of various synthetic or natural rubber polymers, PVC, or other elastomeric materials, dependent upon application or customer requirements. The load bearing member(s) of most belting is generally a woven or interwoven carcass of synthetic or natural fibers such as, but not limited to, polyester, nylon, polyaramid, cotton, as well as steel (cable/cord type or woven mesh).

1.1.4The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.