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SILICONE RUBBER
Technical Data Sheet No.: Q/XHCJ 07570-2012 Starsil™ HCR 940 U
HEAT CURED SILICONE RUBBER
Starsil™ HCR 940 U is a silicone master-batch, heat vulcanizing after the addition of a
Description
vulcanizing agent (chosen according to the transformation process). Starsil™ HCR 940 U is specially recommended for moulding, injection and extrusion of
Applications
articles with a good compromise of mechanical properties.  Slight replastification after prolonged storage  Easy to process Special properties
 Without post-cure or slight post-cure  Good heat stability, up to 225oC, or even 250oC with additive 744  Bright colors easily obtained with Bluestar Silicones SC color bases  Wide range of blends possible with other master-batches  Type (in accordance with GB/T 5576-1997) …………………… VMQ Characteristics
 Density at 25oC, g/cm3, approx………………………………… 1.11  Natural color…………………………………………………… Translucent (1) After addition of 1.25% 2,4-dichloro-benzoyl peroxide(at 50%), and vulcanization for 8min Properties after working
(2) After addition of 1.0% 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane at 45%, and vulcanization for 10 minutes at 170oC 1. Mechanical properties
1.1 Properties without post-cure (1) (2)
Shore A hardness, approx………………………………… 41 Tensile strength, MPa, approx…………………………… Elongation at break, %, approx……………………………. 655 Modulus at 100% elongation, MPa, approx……………… 0.6 Tear strength, kN/m, approx………………………………. 13 Compression set (22h/177°C/25%), % approx…………… 51 Rebound resilience, %, approx……………………………… 52 1.2 Properties after post-cure for 4 hours at 200oC
Shore A hardness, approx…………………………………… 46 Tensile strength, MPa, approx……………………………… 7.8 Elongation at break, %, approx……………………………… 515 Modulus at 100% elongation, MPa, approx………………… 1.0 Tear strength, kN/m, approx………………………………… 14 Compression set (22h/177oC/25%), %, approx…………… 27 Rebound resilience, %, approx……………………………… 61 2. Heat stability
2.1 Properties after ageing 7 days at 177oC
Shore A hardness, approx………………………………… Tensile strength, MPa, approx…………………………… Elongation at break, %, approx……………………………. 425 Modulus at 100% elongation, MPa, approx……………… Tear strength, kN/m, approx………………………………. 12 2.2 Properties after ageing 10 days at 200oC
Starsil™ HCR 940 U
Shore A hardness, approx………………………………… Tensile strength, MPa, approx…………………………… Elongation at break, %, approx……………………………. 405 Modulus at 100% elongation, MPa, approx……………… Tear strength, kN/m, approx……………………………… 13 2.3 Properties after ageing 3 days at 225oC
Shore A hardness, approx…………………………………… 42 Tensile strength, MPa, approx……………………………… 6.7 Elongation at break, %, approx……………………………… 420 Modulus at 100% elongation, MPa, approx………………… 1.2 Tear strength, kN/m, approx………………………………… 12 3. Heat resistance with the
addition of 0.4 parts of
3.1 Properties after ageing 7 days at 177oC
additive 744
Shore A hardness, approx…………………………………… 44 Tensile strength, MPa, approx……………………………… 7.8 Elongation at break, %, approx…………………………….
Modulus at 100% elongation, MPa, approx………………… 1.0 Tear strength, kN/m, approx………………………………. 13 3.2 Properties after ageing 10 days at 200oC
Shore A hardness, approx…………………………………… 44 Tensile strength, MPa, approx……………………………… 7.3 Elongation at break, %, approx…………………………….
Modulus at 100% elongation, MPa, approx………………… 1.2 Tear strength, kN/m, approx………………………………… 13 3.3 Properties after ageing 3 days at 225oC
Shore A hardness, approx…………………………………… 44 Tensile strength, MPa, approx……………………………… 7.5 Elongation at break, %, approx……………………………. 460 Modulus at 100% elongation, MPa, approx………………… 1.1 Tear strength, kN/m, approx………………………………… 14 3.4 Properties after ageing 7 days at 225oC
Shore A hardness, approx…………………………………… 45 Tensile strength, MPa, approx……………………………… 6.3 Elongation at break, %, approx……………………………. 395 Modulus at 100% elongation, MPa, approx………………… 1.2 Tear strength, kN/m, approx………………………………… 13 3.5 Properties after ageing 3 days at 250oC
Shore A hardness, approx…………………………………… 43 Tensile strength, MPa, approx……………………………… 6.4 Elongation at break, %, approx……………………………. 410 Modulus at 100% elongation, MPa, approx………………… 1.2 4. Electrical properties
After addition of 1.1% 2-4 dichloro-benzoyl peroxide (at 50%) and vulcanization for 8
min at 115oC.
Dielectric strength (on 2 mm thick slabs), kV/mm, approx… 19 Starsil™ HCR 940 U
Dielectric constant at 1 MHz, approx……………………… 2.8 Dissipation factor at 1 MHz, approx………………………… 7.0×10-3 Volume resistivity, Ohm.cm, approx……………………… 2.0×1014 Packaging
Starsil™ HCR 940 U is delivered in 20 kg carton boxes.
Starsil™ HCR 940 U may be stored in its original unopened packaging at a temperature below
40oC for up to 18 months from the date of manufacture marked clearly on the packaging.
Storage and shelf life
Past this date, Bluestar Silicones no longer guarantees that the product meets the sales specifications. Consult the Safety Data Sheet of Starsil™ HCR 940 U.
Visit our website: www.lxxh.chemchina.com
Contact:
Address: Xinghuo Industrial Park, Yongxiu, Jiangxi, P. R. China Post code: 330319
Tel.: +86-792-3171301 Fax: +86-792-3171243
Email: [email protected]

Warning to the users:
The information contained in this document is given in good faith based on our current knowledge. It is only an indication and is in no way binding, particularly as regards infringement
of or prejudice to third party rights through the use of our products. BLUESTAR SILICONES guarantees that its products comply with its sales specifications. This information must on
no account be used as a substitute for necessary prior tests which alone can ensure that a product is suitable for given use. Users are responsible for ensuring compliance with local
legislation and for obtaining the necessary certifications and authorisations. Users are requested to check that they are in possession of the latest version of this document and
BLUESTAR SILICONES is at their disposal to supply any additional information.

Source: http://www.lxxhsi.cn/jxxhyjgc/rootfiles/2013/09/03/1377687047891930-1377687047893550.pdf