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WACKER at K 2016: To Present New Improved Oil-resistance LSR for Auto

Published on 2016-07-11. Author : SpecialChem

Oil-resistant O-ring
Oil-resistant O-ring
MUNICH -- WACKER will be presenting a new liquid silicone rubber designed especially for use in automotive engineering applications at the 20th International Trade Fair for Plastics and Rubber K 2016.

K 2016 will take place in Düsseldorf, Germany, from October 19 to 26.

LSR for Automotive Engineering Applications

Properties of New Liquid Silicone Rubber (LSR)

  • Excellent mechanical properties.
  • Enhanced media resistance.
  • Molded parts made of new LSR retain important material properties even in contact with hot motor oil for long periods of time.
  • New silicone grade can be made into O rings and other seals quickly and easily by injection molding.

LSR O-ring
Inside an automobile, a large number of seals and other elastomeric components are in constant contact with engine oil. At the high temperatures that necessarily develop during operation, substances arise in the oil that attack seal materials and result in chemical degradation. Hence, conventional elastomers are generally unsuitable for these types of applications, as they would gradually soften and lose their elasticity.

With the introduction of ELASTOSIL® LR 3016/65, WACKER now offers a liquid silicone rubber that does an even better job of standing up to hot motor oil than previous silicones. The product is formulated in such a way that it reliably counters aggressive components of the oil. Fillers and additives contribute both to excellent long-term oil resistance and to very good mechanical properties in parts molded from ELASTOSIL® LR 3016/65.

Laboratory Tests of New Silicone Grade

  • Parts molded from the new liquid silicone rubber meet important specifications set down by car manufacturers. 
  • Properties such as hardness, elongation at break, tensile strength and tear strength are in full compliance with standards, even after several weeks of storage in motor oil kept at 150 degrees Celsius. 
  • Current specifications for seal materials, for example, call for tear strength of at least 2 N/mm before or 1.5 N/mm after storage in hot motor oil (according to ISO 34-1 A). The tear strength of molded parts made of ELASTOSIL® LR 3016/65 before and after the oil storage test is 13 N/mm and 12 N/mm respectively, which is well within established standards. 

The Shore A hardness value for cured rubber products made of ELASTOSIL® LR 3016/65 is 65. As an extremely fast-curing grade of liquid silicone rubber (LSR) with good flow properties, this product allows manufacturers to cost-effectively make oil-resistant molded parts via injection molding on an industrial scale. Even small parts with delicate structures can be produced with a high level of precision and virtually error free.


WACKER is a globally active chemical company with some 17,000 employees and annual sales of around €5.3 billion (2015). WACKER has a global network of 25 production sites, 22 technical competence centers and 50 sales offices.

WACKER Silicones
Silicone fluids, emulsions, rubber and resins; silanes; pyrogenic silicas; thermoplastic silicone elastomers.

WACKER Polymers
Polyvinyl acetates and vinyl acetate copolymers in the form of dispersible polymer powders, dispersions, solid resins and solutions.

WACKER Biosolutions
Biotech products such as cyclodextrins, cysteine and biologics, as well as fine chemicals and PVAc solid resins.

WACKER Polysilicon
Polysilicon for the semiconductor and photovoltaic industries.

Hyperpure silicon wafers and monocrystals for semiconductor components.

Source: WACKER

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