The material selection platform
Plastics & Elastomers
The material selection platform
Plastics & Elastomers
Product News

WACKER at K 2016: To Launch Hydrolysis- & Steam-resistant Liquid Silicone Rubber for Seals

Published on 2016-07-08. Author : SpecialChem

Seals Made of Liquid Silicone Rubber
Seals Made of Liquid Silicone Rubber
MUNICH -- At K 2016, WACKER will unveil ELASTOSIL® LR 3020/60, a liquid silicone rubber that cures to form a steam-resistant and hydrolytically stable elastomer. The fast-curing rubber is suitable for highly automated injection-molding and therefore enables cost-effective large-scale production of molded seals and other products that need to permanently or regularly withstand hot water or steam. Fields of application include sanitary engineering, heating systems and power plants.

Fast-curing Liquid Silicone Rubber

ELASTOSIL® LR 3020/60 is a two-component liquid silicone rubber compound, which is optimized for injection molding and vulcanizes rapidly via a platinum-catalyzed addition reaction. A special feature is its high steam-resistance once the silicone is cured. Standard silicone elastomers can only withstand superheated steam for short periods, making suitable for such applications to a very limited extent. The reason for this is that silicone elastomers generally hydrolyze under these conditions, i.e. are chemically decomposed by water. This reduces their elastic recovery under pressure. As a result, the seal leaks.

Properties of ELASTOSIL® LR 3020/60 LSR

  • Largely resistant to hydrolysis and even retains its elasticity in persistent contact with superheated steam. 
  • As per measurements post-cured test specimens made from ELASTOSIL® LR 3020/60 stored for 21 days in autoclaves with steam at 150 degrees Celsius have a compression set of 62 percent. 
  • Retains sufficient high elastic recovery for sealing purposes. 
  • Substantially improvement in mechanical properties of the elastomer, such as elasticity and tensile strength.

Advantages of ELASTOSIL® LR 3020/60 LSR

Fast Curing LSR
• ELASTOSIL® LR 3020/60 provides processing advantages over all currently available hot-water- and steam-resistant solid silicone rubbers.
• As a fast-curing liquid silicone rubber, the grade allows particularly short cycle times during injection molding.
• Elastomer products can be precision manufactured with virtually no waste.
• Aids plastics processors to use a hydrolytically stable silicone rubber for large-scale production, enabling the cost-effective manufacture of seals.

Molded parts made from ELASTOSIL® LR 3020/60 are suitable for applications that are regularly exposed to hot water and steam. Typical examples include molded gaskets for domestic appliances such as espresso machines or steam irons, medical equipment, sanitary engineering, heating and power plant technology.

Cured Products of New Liquid Silicone Rubber

The cured products of the new silicone provide a further advantage:
  • They are more resistant than standard liquid silicones to many of the conventional disinfectants and cleaning agents used in medical engineering.
  • Post-cured vulcanizates of the new silicone grade are food-compatible and meet the requirements of the German Federal Institute for Risk Assessment (BfR) and the US Food and Drug Administration (FDA).
  • They also meet the requirements of the hygiene guidelines of the German Federal Environment Agency (UBA) for seals and equipment in warm and cold water applications.


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

PS: If you liked this News, you might enjoy our Plastics & Elastomers Product Newsletter. All the Product News delivered once a week right to your inbox. Sign up here!

Back to Top