On January 31, 2019, the official website of the State Administration of Market Supervision notified the results of the national supervision and inspection of the quality of rubber sealing products. There were 24 batches of products that did not meet the standards.
This time, a total of 20 provinces and autonomous regions including Beijing, Hebei, Shanxi, Liaoning, Heilongjiang, Shanghai, Jiangsu, Zhejiang, Anhui, Fujian, Shandong, Hubei, Hunan, Guangdong, Guangxi, Chongqing, Sichuan, Guizhou, Shaanxi, and Gansu were surveyed. 172 batches of rubber sealing products produced by 159 enterprises in the municipality directly under the central government.
This spot check is based on HG/T 2579-2008 "O-shaped rubber seal ring material for common hydraulic system", HG/T 3326-2007 "Colloid for rubber seals for coal mining comprehensive mechanization equipment", HG/T 2811-1996 Rotating shaft lip seal rubber material" and other standard requirements, hardness, tensile strength, elongation at break, tear strength, compression set, hot air aging test (hardness change, stretching) of rubber seal products Eight items including the liquid resistance test (hardness change, volume change rate) and brittleness temperature were examined in terms of the rate of change of strength and the rate of change in elongation at break.
The spot check found that 24 batches of products did not meet the standard requirements, involving hardness, tensile strength, compression set, hot air aging test (hardness change, elongation at break rate), liquid resistance test (hardness change, volume) Rate of change), brittle temperature items.