HEAT CURED SILICONE RUBBER IOTA HCR 1950 U
Description: IOTA HCR 1950 U is a silicone master-batch, heat curing after the addition of a vulcanizing agent (chosen according to the processing method).
Applications: IOTA HCR 1950 U is recommended for moulding, has good compromise of mechanical properties.
Special properties:
Good mechanical properties;
Good appearance;
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………………………………………………………… 1.14
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 Before post-cure 1) 2)
Shore A hardness, approx……………………………………………………… 53 48
Tensile strength, MPa, approx……………………………………………… 8.8 9.2
Elongation at break, %, approx……………………………………………… 363 486
Modulus at 100% elongation, MPa, approx…………………………… 1.83 1.28
Tear strength, (ASTM D 624 Die B) kN/m, approx……………………. 14 17
Rebound resilience, %, approx……………………………………………… 62 56
Linear shrinkage, %, approx………………………………………………… 1.4 3.3
1.2 Properties after post-cure for 4 hours at 200°C
Shore A hardness, approx……………………………………………………… 51 48
Tensile strength, MPa, approx……………………………………………….. 8.4 9.5
Elongation at break, %, approx…………………………………………… 348 464
Modulus at 100% elongation, MPa, approx………………………… 1.75 1.33
Tear strength (ASTM D 624 Die B),kN/m, approx………………… 14 16
Compression set , (22 h/177℃/25%) %, approx……………………… - 24.2
Rebound resilience, %, approx………………………………………… 57 54
Linear shrinkage, %, approx……………………………………………… 2.0 3.8
2. Thermal stability
Properties after post-cure for 3 days at 225°C
Shore A hardness, approx………………………………………………… 46 43
Tensile strength, MPa, approx…………………………………………….. 7.4 7.3
Elongation at break, %, approx…………………………………………… 338 388
Packaging: IOTA HCR 1950 U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 1950 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.