Shanghai Songjiang Vibration Absorber Group Co., Ltd. official website provides you with information on CJ 208-2005 Flexible Rubber Expansion Joint Material Physical Performance Testing Standards. To determine the product quality and performance of flexible rubber expansion joints, it is necessary to conduct physical performance testing on their materials. Below are the testing standards.
The physical properties of the rubber material used for flexible rubber expansion joints should comply with the specifications outlined in the table below.
Note: The adhesive strength test shall be conducted in products with a nominal diameter greater than 100mm. The test pressure of flexible rubber expansion joints is 1.5 times the working pressure, and the bursting pressure is 3 times the working pressure.
Performance Testing Standards:
- Tensile Strength: GB/T 528
- Elongation at Break: GB/T 528
- Permanent Elongation at Break: GB/T 528
- Brittleness Temperature: GB/T 1682
- Adhesive Strength: GB/T 532
- Thermal Aging: GB/T 3512
- Acid Resistance: GB/T 1690, test liquids are 10% H2SO4, 10% NaOH
- Alkali Resistance: GB/T 1690, test liquids are 10% H2SO4, 10% NaOH
- Hardness: GB/T 531.1
Standards for Potable Water: “Hygienic Safety Evaluation Specification for Drinking Water Transmission and Distribution Equipment and Protective Materials” (2001), GB 5749-2006 “Sanitary Standards for Drinking Water”
Food-Grade Testing Standards: GB/T 4806.1-1994 “Hygienic Standards for Rubber Products for Food Use.
