HEAT CURED SILICONE RUBBER IOTA HCR 370 U
Description：IOTA HCR 370 U is a very transparent silicone heat-curing elastomer which vulcanizes after the addition of a vulcanizing agent selected in accordance with the transformation process.
Applications：Molding and extrusion of transparent parts with high mechanical properties.
Special properties：
Only slight freshening required
Short post cure
High transparency
High mechanical properties
Characteristics：
Type(in accordance with GB/T 5576/1997) ………………………………………… VMQ
Density at 25℃, g/cm3, approx………………………………………………………… 1.18
Aspect…………………………………………………………………Colorless, 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………………………………. 65 68
Tensile strength, MPa, approx…………………………… 9.1 8.9
Elongation at break, %, approx………………………… 520 540
Modulus at 100% elongatioin, MPa, approx ………… 2.4 2.3
Tear strength, kN/m, approx……………………………… 44 43
Rebound resilience, %, approx…………………………… 35 36
Linear shrinkage, %, approx. ……………………………… 2.7 3.7
1.2 Properties after post-cure for 4 hours at 200℃
Shore A hardness, approx………………………………. 70 74
Tensile strength, MPa, approx…………………………… 9.3 9.6
Elongation at break, %, approx……………………… 440 450
Modulus at 100% elongatioin, MPa, approx ……… 2.9 3.5
Tear strength, kN/m, approx…………………………… 40 41
Compression set (22h/177℃/25%), %, approx……… 52 38
Rebound resilience, %, approx………………………… 36 38
Linear shrinkage, %, approx. ……………………………… 3.3 4.3
2. Heat stability
Properties after ageing 7 days at 177°C
Shore A hardness, approx……………………………… 75 80
Tensile strength, MPa, approx…………………………… 8.1 7.6
Elongation at break, %, approx………………………… 240 200
Packaging: IOTA HCR 370 U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 370 U 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.
