HEAT CURED SILICONE RUBBER IOTA HCR 1920 U
Description: IOTA HCR 1920 U is a silicone master-batch, heat curing after the addition of a vulcanizing agent (chosen according to the processing method).
Applications: IOTA HCR 1920 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…………………………………………………………… 1.07
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 Before post-cure
Shore A hardness, approx……………………………………………………………21
Tensile strength, MPa, approx…………………………………………………… 7.4
Elongation at break, %, approx……………………………………………… …. 1037
Modulus at 100% elongation, MPa, approx…………………………………. 0.35
Tear strength, (ASTM D 624 Die B) kN/m, approx………………………. 14
Rebound resilience, %, approx…………………………………………………… 50
Linear shrinkage, %, approx……………………………………………………… 3.9
1.2 Properties after post-cure for 4 hours at 200°C
Shore A hardness, approx………………………………………………… 20
Tensile strength, MPa, approx………………………………………….. 5.6
Elongation at break, %, approx……………………………………… 759
Modulus at 100% elongation, MPa, approx…………………… 0.4
Tear strength (ASTM D 624 Die B),kN/m, approx………… 12
Rebound resilience, %, approx………………………………………… 50
Compression set , (22 h/177℃/25%) %, approx………………… 47
Packaging: IOTA HCR 1920 U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 1920 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.