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ELASTOSIL® LR 3070/50 US A/B

ELASTOSIL® LR 3070/50 US A/B is a primerless, self-bonding liquid silicone rubber (LSR) grade that adheres to various plastic substrates, e.g. PA, PBT, and metals, but not to the mold surface. The bonding is improved by oven-curing for 1 hour at 100°C or 24 hours at room temperature.

Brand: ELASTOSIL® LR (114 products)

Polymer Name: Liquid Silicone Rubber (LSR)

Processing Methods: Injection Molding

Tear Strength: 25.0 - 25.0 kN/m

Technical Data Sheet

Enhanced TDS

Knowde-enriched technical product data sheet

Identification & Functionality

Applications & Uses

Plastics & Elastomers Processing Methods
Application Details

ELASTOSIL® LR 3070/50 US A/B can be processed using standard liquid rubber injection molding techniques for over molding or co-molding (2K processes) without special treatment of the mold surface. Parts made from ELASTOSIL® LR 3070-series can be used for technical applications without post curing but do not comply with regulations for pharmaceutical or food contact.

Processing

ELASTOSIL® LR 3070/50 US A/B is a 2-part, 1:1 ratio system. Parts A and B are delivered in matching quantities in 20-kg and 200-kg pails and drums. With proper metering equipment, product can be pumped 1:1 (A:B) directly from the containers into a static mixer and the injection molding machine. The mixed pot life in the closed system is 2-3 days. Note: New molds should be “seasoned” with ELASTOSIL® LR 3003 for 100 shots prior to production.

Properties

Cured Properties
ValueUnitsTest Method / Conditions
Brittle Pointmax. -73°C-
Dynamic Viscosity (A side)550000mPa·s-
Dynamic Viscosity (B side)900000mPa·s-
Elongation (at break)500%-
Modulus (at 100 % elongation)15kPa-
Pot Life (at 25°C)48hours-
Shore Hardness A50--
Shrinkage (with post cure)3.5%-
Shrinkage (without post cure)3%-
Specific Gravity1.13g/cm³-
Tear Resistance145--
Tear Resistance25N/mm-
Tensile Strength11.1mPa-
Properties

ELASTOSIL® LR 3070 series are primerless self-bonding grades that adhere to various plastic substrates e.g. PA, PBT and metals, but not to the mold surface. The bonding is improved by oven-cure for 1 hour at 100°C or 24 hours at room temperature. Because of individual surface properties, each substrate must be tested before production.

Note

Cure conditions : Press cure 5 mins at 165°C.

Regulatory & Compliance

Packaging & Availability

Storage & Handling

Shelf Life
6 Months
Storage Information
  • ELASTOSIL® LR 3070/50 US A/B has a shelf life of 6 months when stored below 32°C in the tightly closed original container.
  • Storage beyond the recommended shelf-life does not necessarily mean that the product is no longer usable.
  • However, the properties required for the intended use must be checked for quality assurance reasons.
  • Once opened, containers should always be resealed to prevent catalyst poisoning by amines, sulfur compounds, and other substances