HEAT CURED SILICONE RUBBER IOTA HCR 1980 U
Description: IOTA HCR 1980 U is a silicone master-batch, heat curing after the
addition of a vulcanizing agent (chosen according to the processing method).
Applications: IOTA HCR 1980 U is recommended for moulding, has good compromise
of mechanical properties.
Special properties:
Good mechanical properties;
Good appearance, anti-yellowing;
Good heat stability, up to 200°C;
Not easy to structured after long-term storage;
No post curing or slight post curing;
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………………………………………………………
1.24
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 Without post-cure
Shore A hardness, approx…………………………………………………… 81
Tensile strength, MPa, approx……………………………………………… 7.8
Elongation at break, %, approx……………………………………………. 206
Modulus at 100% elongation, MPa, approx…………………………. 4.18
Tear strength, (ASTM D 624 Die B) kN/m, approx…………………… 13.5
Rebound resilience, %, approx……………………………………………… 43
Linear shrinkage, %, approx…………………………………………………… 3.5
1.2 Properties after post-cure for 4 hours at 200°C
Shore A hardness, approx…………………………………………………… 84
Tensile strength, MPa, approx…………………………………………….. 7.1
Elongation at break, %, approx…………………………………………… 172
Modulus at 100% elongation, MPa, approx…………………………… 4.07
Tear strength (ASTM D 624 Die B),kN/m, approx………………… 13.1
Compression set , (22 h/177℃/25%) %, approx…………………… 18.4
Rebound resilience, %, approx…………………………………………… 44
2.
Thermal stability:
Properties after post-cure for 3 days at 225°C
Shore A hardness, approx………………………………………………
87
Tensile strength, MPa, approx……………………………………..… 4.9
Elongation at break, %, approx………………………………………
108
Packaging: IOTA HCR 1980 U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 1980 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.