输送带使用时受物料的冲击、磨损和微生物侵蚀，以及各种老化作用。因此，要求覆盖胶具有较好的拉伸强度（≥18Mpa）和耐磨性（磨耗量0.8cm3/1.61Km），耐老化、耐生物侵蚀。此外还要求具有良好的粘性等工艺性能，配方设计要点如下：生胶以天然橡胶为主或并用适量的丁苯橡胶，含胶率控制在50%~55%。硫化体系采用硫磺、促进剂传统配合体系。在天然橡胶配方中，硫磺用量为2.5质量份左右；在丁苯橡胶配方中，硫磺用量为1.5~2.0质量份。促进剂一般采用M、DM并用，促进剂CZ、NOBS等后效性促进剂适合于含丁苯橡胶的胶料中。补强剂可选用高耐磨炭黑、中超耐磨炭黑等，用量为40~50质量份。软化剂常选用的品种有机油、重油、松焦油、古马隆树脂和石油树脂。
The conveyor belt is affected by the impact, wear and microbial erosion of materials, as well as various aging effects. Therefore, the covering adhesive is required to have good tensile strength (≥ 18Mpa), wear resistance (abrasion 0.8cm3 / 1.61km), aging resistance and biological erosion resistance. In addition, it is also required to have good viscosity and other technological properties. The key points of formulation design are as follows: raw rubber is mainly natural rubber or SBR is used in combination, and the rubber content is controlled within 50% ~ 55%. Traditional coordination system of sulfur and accelerant is adopted in the vulcanization system. In the natural rubber formula, the sulfur content is about 2.5 parts by mass; in the SBR formula, the sulfur content is 1.5 ~ 2.0 parts by mass. Generally, m and DM are used as accelerators. CZ and nobs are suitable for SBR compound. High wear-resistant carbon black and medium and super wear-resistant carbon black can be selected as reinforcing agent, with the dosage of 40-50 parts by mass. Softeners are often used in oil, heavy oil, pine tar, gumalon resin and petroleum resin.