ELASTOSIL® LR 3071/40 A/B
Self-adhesive liquid silicone rubbers of the ELASTOSIL® LR 3071 series are paste-like, easily-pigmentable two-component compounds with extremely short curing times. Their vulcanizates are noted for excellent mechanical and electrical properties.
ELASTOSIL® LR 3071 series are primerless, selfbonding grades that adhere to various plastic substrates (e.g. PA, PBT) and metals, but not in the mold (adhesive adherence, protects against loss prior to assembly). The bonding is improved by a subsequent heat treatment process (e.g. one hour at 100 °C) or by a longer storing at room temperature. Because of the individual surface properties each substrate must be tested before mass production. If necessary one has to check the development of adhesive properties over time and/or in an environment relevant to the application. The vulcanizates are noted for good mechanical and electrical properties.
Specific features of ELASTOSIL® LR 3071/40 A/B
- Reduced volatile content
ELASTOSIL® LR 3071 series are particularly suitable for the economical production of large series of overmolded parts (thermoplastic/elastomer), even in a comolding process (shuttle mold) under standard conditions, without any special treatment of the mold surface.
Parts made from ELASTOSIL® LR 3071 can generally be used for technical applications without postcuring.
Postcured parts can be used for food contact applications and are suitable for use under the Recommendation "XV. Silicones" of the BfR and FDA § 177.2600 under observance of any given limitations on extractable and volatile substances.
The A and B components are delivered ready to use in 20 kg pail and 200 kg drum kits. With adequate metering equipment, they can be pumped directly from the original containers into the injection molding machine and mixed by a static mixer. The mixing ratio is 1 : 1. At room temperature, mixtures of A and B components have a pot life of at least three days.
Note: Start-up of new molds should be supported by use of ELASTOSIL® AUX Mold Release Agent 32.
For detailed information please refer to the latest edition of our brochure "SOLID AND LIQUID SILICONE RUBBER - MATERIAL AND PROCESSING GUIDELINES".
This product is available in 20 kg pail and 200 kg drum kits.
Once opened, containers should always be resealed after use to prevent the platinum catalyst from being poisoned by amines, sulphur or phosphorus compounds. The 'Best use before end' date of each batch is shown on the product label. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.