HEAT CURED SILICONE RUBBER IOTA HCR 1930 U
Description: IOTA HCR 1930 U is a silicone master-batch, heat curing after the addition of a vulcanizing agent (chosen according to the processing method).
Applications: IOTA HCR 1930 U is recommended for moulding, has good compromise of mechanical properties.
Special properties:
Low hardness, good mechanical properties;
Good appearance;
Good heat stability, up to 200°C;
Not easy to structured after long-term storage;
No need to post-cure or post-cure time is short
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………………………………………………………… 1.09
Natural color……………………………………………………………………… translucent
Properties after working:
1) After addition of 1.25% Di(2,4-dichlorobenzoyl) peroxide (at 50%), and vulcanization for 8min at 115℃
2) After addition of 1.1% 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane (at 45%), and vulcanization for 10 minutes at 175℃
1.Mechanical property:
1.1 Properties before post-cure 1) 2)
Shore A hardness, approx………………………………………………………… 35 28
Tensile strength, MPa, approx…………………………………………………… 6.2 7.9
Elongation at break, %, approx…………………………………………………. 539 836
Modulus at 100% elongation, MPa, approx………………………………. 0.68 0.45
Tear strength, (ASTM D 624 Die B) kN/m, approx………………………. 10 12
Rebound resilience, %, approx………………………………………………… 6 58
Linear shrinkage, %, approx……………………………………………… … 1.47 3.50
1.2 Properties after post-cure for 4 hours at 200°C
Shore A hardness, approx………………………………………………… 32 26
Tensile strength, MPa, approx………………………………………….. 5.9 6.0
Elongation at break, %, approx……………………………………… 513 727
Modulus at 100% elongation, MPa, approx………………………… 0.64 0.42
Tear strength (ASTM D 624 Die B)，kN/m, approx…………………… 10 12
Rebound resilience, %, approx………………………………………… - 48
Compression set , (22 h/177℃/25%) %, approx……………………… 61 51
Linear shrinkage, %, approx……………………………………………… 1.9 3.8
2. Heat stability
Properties after post-cure for 3 days at 225°C
Shore A hardness, approx……………………………………………… 21 15
Tensile strength, MPa, approx……………………………………….. 4.5 3.8
Elongation at break, %, approx……………………………………… 581 758
Packaging: IOTA HCR 1930 U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 1930 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.
