IOTA HCR 970 U is silicone master-batch, heat vulcanizing after the addition of a vulcanizing agent (chosen according to the transformation process).
HEAT CURED SILICONE RUBBER IOTA HCR 970 U
Description: IOTA HCR 970 U is silicone master-batch, heat vulcanizing after the addition of a vulcanizing agent (chosen according to the transformation process).
Applications: IOTA HCR 970 U is recommended for moulding, injecting and extruding articles with good mechanical properties (in particular a low compression set, high resiliency and a
remarkably low tack).
Special properties:
Slight replastification after prolonged storage
Easy to process
Without post-cure or slight post-cure
Good heat stability, up to 225°C, or even 250°C with additive 744
Wide range of blends possible with other master-batches
Characteristics:
Type (in accordance with GB/T 5576-1997) ………………… VMQ
Density at 25°C, g/cm3, approx………………………..………… 1.17
Natural color………………………………………………….…………… Translucent
Properties after working:
(1) After addition of 1.25% 2,4-dichloro-benzoyl peroxide (50%), and vulcanization for 8 minutes at 115°C
(2) After addition of 1.0% 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane (45%), and vulcanization for 10 minutes at 170°C
1. Mechanical properties
1.1 Properties without post-cure (1) (2)
Shore A hardness, approx………………………………… 68 67
Tensile strength, MPa, approx…………………………… 8.5 8.8
Elongation at break, %, approx…………………………. 380 500
Modulus at 100% elongation, MPa, approx……….. 2.1 1.8
Tear strength, kN/m, approx………………………………. 20 21
Compression set (22 h/177°C/25 %), % approx…… 60 25
Rebound resilience, %, approx…………………………… 51 53
Linear shrinkage, %, approx………………………………. 0.7 0.7
1.2 Properties after post-cure for 4 hours at 200°C
Shore A hardness, approx………………………………… 70 70
Tensile strength, MPa, approx…………………………… 8.3 8.5
Elongation at break, %, approx………………………. 350 450
Modulus at 100% elongation, MPa, approx………… 2.3 1.9
Tear strength, kN/m, approx…………………………….. 18 20
Compression set (22h/177oC/25%), %, approx…… 42 21
Rebound resilience, %, approx…………………………… 54 52
Linear shrinkage, %, approx……………………………… 2.0 4.0
2. Heat stability
2.1 Properties after ageing 7 days at 177°C
Shore A hardness, approx………………………………… 69 70
Tensile strength, MPa, approx…………………………… 8.1 7.6
Elongation at break, %, approx…………………………. 325 370
Tear strength, kN/m, approx…………………………….. 15 18
2.2 Properties after ageing 10 days at 200°C
Shore A hardness, approx………………………………… 70 72
Tensile strength, MPa, approx………………………..… 6.2 6.1
Elongation at break, %, approx………………………... 230 270
Tear strength, kN/m, approx…………………………..…13 15
2.3 Properties after ageing 3 days at 225°C
Shore A hardness, approx……………………………..… 74 77
Tensile strength, MPa, approx……………………….… 5.1 5.8
Elongation at break, %, approx…………………….…. 135 120
Tear strength, kN/m, approx…………………………..… 9 8
3. Heat resistance with the addition of 0.4 parts of additive 744
3.1 Properties after ageing 7 days at 177°C
Shore A hardness, approx……………………………..…. 70 70
Tensile strength, MPa, approx…………………………… 8.0 8.2
Elongation at break, %, approx……………………..…. 330 400
Tear strength, kN/m, approx……………………………. 17 19
3.2 Properties after ageing 10 days at 200°C
Shore A hardness, approx………………………………… 69 71
Tensile strength, MPa, approx………………………….. 6.4 6.4
Elongation at break, %, approx………………………. 310 360
Tear strength, kN/m, approx……………………………. 16 19
3.3 Properties after ageing 3 days at 225°C
Shore A hardness, approx……………………………… 67 68
Tensile strength, MPa, approx………………………..… 8.0 8.2
Elongation at break, %, approx………………………. 325 390
Tear strength, kN/m, approx……………………….…… 13 16
3.4 Properties after ageing 7 days at 225°C
Shore A hardness, approx.................................... 67 70
Tensile strength, MPa, approx………………………….. 5.6 5.6
Elongation at break, %, approx……………………..…. 210 240
Tear strength, kN/m, approx…………………………….. 13 16
3.5 Properties after ageing 3 days at 250°C
Shore A hardness, approx………………………………… 67 71
Tensile strength, MPa, approx…………………………… 6.4 6.4
Elongation at break, %, approx…………………………. 210 360
Tear strength, kN/m, approx………………………….…. 13 19
4. Electrical properties:
Dielectric strength (on 2 mm thick slabs), kV/mm, approx… 21
Breakdown voltage, kV, approx…………………………….…… 45
Dielectric constant at 1 MHz, approx…………………….…… 2.8
Dissipation factor at 1 MHz, approx……………………………3.5×10-3
Volume resistivity, Ohm.cm, approx……………………………… 2.2×1014
Packing: IOTA HCR 970 U is delivered in 20 kg carton boxes.
Storage and shelf life:
IOTA HCR 970 U may be stored in its original unopened packaging at a temperature
below 40°C for up to 18 months from the date of manufacture marked clearly on the packaging.
Past this date, IOTA no longer guarantee that the product meets the sales specifications.
Address: | Sunmoon Industry Park, 985 Xingzhong Road, High-Tech Zone, Bengbu China |
Post Code: |
233000 |
Contact: | Allen |
Telephone: | 0086-552-3827158 |
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Mobile: | 0086-15605528186 |
Email: | allenwang@siliconeoil.net |
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