ELASTOSIL® LR 3271/45 A/B
Self-adhesive liquid silicone rubbers of the ELASTOSIL® LR 3271 series are paste-like, easily-pigmentable two-component compounds with extremely short curing times.
ELASTOSIL® LR 3271 series are primerless, selfbonding grades that adhere to various plastic substrates (e.g. PET, PBT) and metals, but not in the mold. The bonding is improved by a subsequent heat treatment process (e.g. four hours at 100 °C). 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.
Specific features of ELASTOSIL® LR 3271/45 A/B
- Hot water resistant
- Reduced volatile content
All the information provided is in accordance with the present state of our knowledge. Nonetheless, we disclaim any warranty or liability whatsoever and reserve the right, at any time, to effect technical alterations. The information provided, as well as the product's fitness for an intended application, should be checked by the buyer in preliminary trials. Contractual terms and conditions always take precedence. This disclaimer of warranty and liability also applies particularly in foreign countries with respect to third parties' rights.
ELASTOSIL® LR 3271 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.
ELASTOSIL® LR 3271 series has been particularly designed for sanitary applications and shows excellent bonding performance to Polyesters and significantly improved hot water hydrolysis resistance of the adhesion layer.
Parts made from ELASTOSIL® LR 3271 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 refer to 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.