Test Background
Tear is a phenomenon in which cracks in elastomeric materials such as rubber expand due to stress. Tear strength is used to characterize the ability of a material to resist tearing. It refers to the load per unit thickness when the sample is torn. Vulcanized or Thermoplastic Rubber Tear Strength Test Four general methods can be used to test the tear strength of rubber.
Zhongke Testing Reliability Experiment Center has the ability to test the reliability performance of various vulcanized rubbers or thermoplastic rubbers, and provides professional tear strength testing services for vulcanized rubbers or thermoplastic rubbers.
Scope of tests
Vulcanized rubber: flat vulcanizing machine vulcanizing type, vulcanizing tank vulcanizing type, continuous vulcanizing type, special vulcanizing type, etc.
Thermoplastic rubber: polystyrene, polyurethane, polyolefin, polyester, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, polyethylene-butyl rubber joint copolymer, etc.
Test method
Method A: Use trouser-shaped specimens. Using trouser-shaped specimens is not sensitive to the length of the cut. The results obtained are more likely to be related to the basic tearing properties of the material and less affected by the tensile stress, and the tear expansion speed is directly related to the holder stretching speed.
Method B, Test Procedure (a): Using uncut rectangular specimens. This test is a combination of tear initiation and tear propagation. The stress at the right angle point rises sufficiently to cause initial tearing, then the stress increases further until the specimen tears, and only the total force required to break the specimen can be determined.
Method B, test procedure (b): Use a cut right-angled specimen. This test is to cut the specimen in advance and measure the force required to extend the tear. The speed of expansion is not directly related to the speed of stretching.
Method C: Using a crescent-shaped specimen. This test also cuts the specimen in advance to measure the force required to expand and tear, and the expansion speed has nothing to do with the tensile speed.
Method D: Delft specimen Determine the force required to tear across the entire width of a small specimen with a cut in the center (the cut is completed when cutting the specimen).
Test standard:
GB/T 529-2008 Determination of tear strength of vulcanized rubber or thermoplastic rubber (trouser-shaped, right-angled and crescent-shaped specimens)
GB/T 12829-2006 Determination of tear strength of small specimens of vulcanized rubber or thermoplastic rubber (Delft specimens)
ISO 34-1: 2015 Determination of tear strength of vulcanized rubber or thermoplastic rubber Part 1: Trouser-shaped, right-angled and crescent-shaped specimens)
ISO 34-2-2015 Determination of tear strength of hardened or thermoplastic rubber Part 2: Small test piece (Delft)
BS ISO 34-2-2015 Determination of tear strength of hardened or thermoplastic rubber Part 2: Small test piece (Delft)
NF ISO 34-2-2015 Determination of tear strength of hardened or thermoplastic rubber Part 2: Small test piece (Delft)
ISO 34-1: 2015 Determination of tear strength of vulcanized rubber or thermoplastic rubber Part 1: Trouser-shaped, right-angled and crescent-shaped specimens)
DIN ISO 34-1: 2016 Determination of tear strength of vulcanized rubber or thermoplastic rubber Part 1: Trouser-shaped, right-angled and crescent-shaped specimens)
BS ISO 34-1: 2015 Determination of tear strength of vulcanized rubber or thermoplastic rubber Part 1: Trouser-shaped, right-angled and crescent-shaped specimens)
