HEAT CURED SILICONE RUBBER IOTA HCR 175 U
Description:IOTA HCR
175 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………………………………………………………… 1.18
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………………………………. 69 67
Tensile
strength, MPa, approx……………………………… 9.8 9.7
Elongation
at break, %, approx…………………………… 270 320
Modulus at
100% elongatioin, MPa, approx ……………… 3.6 2.8
Tear
strength, kN/m, approx…………………………………
21 24
Rebound
resilience, %, approx………………………………… 54 46
Linear
shrinkage, %, approx. …………………………………
2.6 4.2
1.2 Properties after post-cure for 4 hours at 200℃
Shore A
hardness, approx……………………………………. 75 74
Tensile
strength, MPa, approx………………………………… 9.3 9.4
Elongation
at break, %, approx…………………………… 260 290
Modulus at
100% elongatioin, MPa, approx …………… 3.4
3.1
Tear
strength, kN/m, approx…………………………………
21 23
Compression
set (22h/177℃/25%), %, approx……………
37 29
Rebound
resilience, %, approx………………………………… 45 41
Linear
shrinkage, %, approx……………………………………
2.6 4.2
2. Heat
stability
2.1
Properties after ageing 10 days at 200°C
Shore A
hardness, approx…………………………………… 78 80
Tensile
strength, MPa, approx………………………………… 7.3 7.2
Elongation
at break, %, approx………………………………… 200 190
Packaging: IOTA HCR 175U is
delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 175U 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.