Glossary of Terms and Acronyms Micronized Rubber Powder (MRP) Some companies have defined MRP particle size distributions to be from 180 µm (80 mesh) to 20 µm (635 mesh). Monofil A single-use landfill or landfill cell used for homogeneous material storage. N NR (Natural Rubber) Rubber or rubber latex from a plant that can be vulcanized and finished into products. Nominal A term commonly used to refer to the average size product (chip) that comprises 50 percent or more of the throughput in a scrap tire processing operation. It should be noted that any scrap tire processing operation also would generate products (chips) above and below the nominal range of the machine. (ASTM D6700) NPT Non-pneumatic tires- airless tires or flat free tires that are not supported by air pressure. They are used on vehicles such as lawn mowers, golf carts, lift trucks, military vehicles and other similar applications. O OTR (Off-the-Road tire) A term used within the tire industry to define a broad range of tires that are not designed for use on the road. The term generally encompasses tires that fall outside the motorcycle, passenger car, light truck, and heavy-duty truck tire categories. See Appendix A – Additional Information regarding classifications of OTRs. Occupational Health & Safety Administration (OSHA) The federal agency is responsible for establishing and enforcing safety and health regulations in the workplace. Office of Environmental Health Hazard Assessment (OEHHA) The office’s mission is to protect and enhance the health of Californians and the state’s environment through scientific evaluations.
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