HEAT CURED SILICONE RUBBER IOTA HCR 180 U
Description：IOTA HCR 180 U is a silicone master batch, vulcanizing under heat after addition of a vulcanizing agent (chosen according to the vulcanizing process).
Applications：Moulding, injection, extrusion of articles with good mechanical properties.
Special properties：
Very slight replastification after prolonged storage
Easy to process
No post-cure or slight post-cure
Good mechanical properties
Good heat stability, up to 200℃
Transparency
Wide possibility of reloading and blending
Characteristics：
Type(in accordance with GB/T 5576/1997) ………………………………………… VMQ
Density at 25℃, g/cm3, approx………………………………………………………… 1.21
Natural color…………………………………………………………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………………………………. 79 78
Tensile strength, MPa, approx……………………………… 10.4 10.8
Elongation at break, %, approx…………………………… 230 330
Modulus at 100% elongatioin, MPa, approx ……………… 5.2 3.7
Tear strength, kN/m, approx………………………………… 18 19
Compression set (22h/177oC/25%), %, approx. …………………… 67 60
Rebound resilience, %, approx……………………………… 45 44
1.2 Properties after post-cure for 4 hours at 200℃
Shore A hardness, approx……………………………………. 81 81
Tensile strength, MPa, approx………………………………… 9.0 9.2
Elongation at break, %, approx…………………………… 200 280
Modulus at 100% elongatioin, MPa, approx …………… 5.3 4.0
Tear strength, kN/m, approx………………………………… 19 20
Compression set (22h/177℃/25%), %, approx…………… 49 40
Rebound resilience, %, approx……………………………… 46 45
2. Heat stability
2.1 Properties after heat-ageing 10 days at 200°C
Shore A hardness, approx…………………………………… 87 89
Tensile strength, MPa, approx………………………………… 6.6 6.6
Elongation at break, %, approx……………………………… 70 60
Tear strength, kN/m, approx………………………………… 17 16
Rebound resilience, %, approx……………………………… 57 59
Packaging: IOTA HCR 180U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 180U 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.
