HEAT CURED SILICONE RUBBER IOTA HCR 2970 U
Description: IOTA HCR 2970 U is a silicone master-batch, heat curing after the addition of a vulcanizing agent (chosen according to the processing method).
Applications: IOTA HCR 2970 U is recommended for buttons, O-rings, gaskets, seals, rubber rollers and other requirements of high resilience and low compression set of products.
Special properties:
High resilience, low compression set;
Good appearance,anti-yellowing;
Good mechanical properties;
Easy processing, non-stick rollers, easy release;
Not easy to structured after long-term storage;
Good thermal stability;
Wide possibilities for blending with other master batch.
Characteristics
Type (in accordance with GB/T 5576-1997) …………………………… VMQ
Density at 25°C, g/cm3, approx…………………………………………… 1.192
Natural color…………………………………………………………………… translucent
Properties after working:
After addition of 1.1% 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane (at 45%), and vulcanization for 5 minutes at 175℃
1.Mechanical property:
1.1 Without post-cure
Shore A hardness, approx………………………………………………… 73
Tensile strength, MPa, approx…………………………………………… 7.9
Elongation at break, %, approx…………………………………………. 285
Modulus at 100% elongation, MPa, approx…………………………. 3.12
Tear strength, (ASTM D 624 Die B) kN/m, approx………………………. 13
Rebound resilience, %, approx…………………………………………… 52
1.2 Properties after post-cure for 4 hours at 200°C
Shore A hardness, approx……………………………………………… 73
Tensile strength, MPa, approx………………………………………….. 8.0
Elongation at break, %, approx………………………………………… 282
Modulus at 100% elongation, MPa, approx…………………………… 3.12
Tear strength (ASTM D 624 Die B)，kN/m, approx…………………… 12
Compression set , (22 h/177℃/25%) %, approx………………………… 15
Rebound resilience, %, approx………………………………………… 50
Packaging: IOTA HCR 2970 U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 2970 U may be stored in its original unopened packaging at a temperature below 40°C for up to 6 months from the date of manufacture marked clearly on the packaging.
Past this date, IOTA no longer guarantees that the product meets the sales specifications.
