HEAT CURED SILICONE RUBBER IOTA HCR 960 U
Description：IOTA HCR 960 U is a silicone master-batch, heat vulcanizing under heat after addition of a vulcanizing agent (chosen according to the transformation process).
Applications：
Tubing and profiles: transparent and bright colors.
Technical moulded parts especially compounds from blends of other “Mix and Fix” series.
Characteristics：
Type(in accordance with GB/T 5576/1997) ………………………………………… VMQ
Density at 25℃, g/cm3, approx………………………………………………………… 1.15
Natural color…………………………………………………………………… transparent
Properties after working:
(1) After addition of 1.25% 2,4-dichloro-benzoyl peroxide (at 50%), and vulcanization for 8min at 115℃
(2) After addition of 1.0% 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane at 45%, and vulcanization for 10 minutes at 170℃
1. Mechanical properties
1.1 Properties without post-cure (1) (2)
Shore A hardness, approx………………………………. 58 57
Tensile strength, MPa, approx……………………………… 6.9 7.7
Elongation at break, %, approx…………………………… 260 320
Modulus at 100% elongatioin, MPa, approx ……………… 2.14 1.8
Tear strength, kN/m, approx………………………………… 12 12
Compression set (22h/177oC/25%), %, approx. …………… 38 16
Rebound resilience, %, approx………………………………… 55 54
Linear shrinkage, %, approx………………………… 2.6 4.3
1.2 Properties after post-cure for 4 hours at 200℃
Shore A hardness, approx……………………………………. 61 59
Tensile strength, MPa, approx………………………………… 7.0 7.1
Elongation at break, %, approx…………………………… 250 280
Modulus at 100% elongatioin, MPa, approx …………… 2.25 1.95
Tear strength, kN/m, approx………………………………… 11 13
Compression set (22h/177℃/25%), %, approx…………… 25 12
Rebound resilience, %, approx……………………………… 57 58
Linear shrinkage, %, approx. ………………………………… 2.8 4.6
2. Heat stability
2.1 Properties after ageing 7 days at 177°C
Shore A hardness, approx……………………………………. 62 63
Tensile strength, MPa, approx………………………………… 7.8 7.6
Elongation at break, %, approx…………………………… 250 265
Tear strength, kN/m, approx………………………………… 11 13
2.2 Properties after heat-ageing 10 days at 200°C
Shore A hardness, approx……………………………………. 64 67
Tensile strength, MPa, approx………………………………… 6.3 6.3
Elongation at break, %, approx…………………………… 200 185
Tear strength, kN/m, approx………………………………… 10 10
Packaging: IOTA HCR 960U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 960U may be stored in its original unopened packaging at a temperature below 40℃ for up to 18 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.
