Full definition
Oil-resistant belts are specifically designed to withstand the damaging effects of various oils, including mineral oils, vegetable oils, greases, and hydrocarbons. The primary materials used for these belts include nitrile rubber (NBR) and chloroprene (CR/neoprene), which are formulated to prevent swelling, softening, and degradation when in contact with these substances. According to ISO 14890, oil-resistant belts are classified into two categories: MOR (moderate oil resistance) suitable for animal fats and vegetable oils, and MORV (severe oil resistance) intended for more aggressive environments involving mineral oils and fuels. This classification is crucial for selecting the correct belt for specific applications where oil exposure is expected.
Testing for oil resistance involves immersion in ASTM Oil No. 1 and No. 3 at elevated temperatures, where the volume swell and tensile loss are measured. Nitrile covers with an ACN (acrylonitrile) content of 30-40% are particularly effective against petroleum-based oils and are commonly utilized in heavy-duty applications. In contrast, neoprene covers are favored when there is a simultaneous need for oil and flame resistance, making them ideal for applications exposed to both hazards.
Oil-resistant belts are widely used in various industrial applications, including oilseed processing, recycling facilities, metalworking chip conveyors, food processing operations, steelworks, and ports that handle oily cargoes. For food-related applications, these belts can be manufactured with FDA-compliant white nitrile covers, ensuring safety and compliance with health regulations. The top cover thickness of these belts typically ranges from 2 to 6 mm, depending on the application and required durability. Brands recognized for their quality in this category include Continental, Fenner Dunlop, Habasit, and Forbo.