HEAT CURED SILICONE RUBBER IOTA HCR 1970 U
Description: IOTA HCR 1970 U is a silicone master-batch, heat curing after the addition of a vulcanizing agent (chosen according to the processing method).
Applications: IOTA HCR 1970 U is recommended for moulding, has good compromise of mechanical properties.
Special properties:
Good mechanical properties;
Good appearance, anti-yellowing;
Good heat stability, up to 200°C;
Not easy to structured after long-term storage;
No post curing or slight post curing;
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………………………………………………… 1.22
Natural color………………………………………………………………… translucent
Properties after working:
1) After addition of 1.25% Di(2,4-dichlorobenzoyl) peroxide (at 50%), and vulcanization for 8 minutes at 115℃
2) 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 Properties without post-cure 1) 2)
Shore A hardness, approx……………………………………………………… 69 69
Tensile strength, MPa, approx………………………………………………… 7.3 8.4
Elongation at break, %, approx………………………………………………. 372 399
Modulus at 100% elongation, MPa, approx……………………………. 2.64 2.68
Tear strength, (ASTM D 624 Die B) kN/m, approx………………… 19 19
Rebound resilience, %, approx…………………………………………… 43 42
Linear shrinkage, %, approx………………………………………………… 1.5 3.2
1.2Properties after post-cure for 4 hours at 200°C
Shore A hardness, approx………………………………………………… 71 73
Tensile strength, MPa, approx………………………………………….. 8.2 8.8
Elongation at break, %, approx………………………………………… 326 358
Modulus at 100% elongation, MPa, approx………………………… 3.00 2.93
Tear strength (ASTM D 624 Die B),kN/m, approx…………… 16 17
Compression set , (22 h/177℃/25%) %, approx……………… - 27
Rebound resilience, %, approx………………………………………… 40 42
Linear shrinkage, %, approx……………………………………………… 2.1 3.8
2. Thermal stability
Properties after post-cure for 3 days at 225°C
Shore A hardness, approx………………………………………………… 74 76
Tensile strength, MPa, approx………………………………………….. 6.4 6.1
Elongation at break, %, approx…………………………………………… 11 204
Packaging: IOTA HCR 1970 U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 1970 U may be stored in its original unopened packaging at a temperature below 40°C for up to 12 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.