Remix each of the two components (part A and B) every time before using.
1. Mixing of the two components
BLUESIL RTV 3722 A&B should be used by means of a spray or injection equipment with a meter/static mixer, as the pot life is too short to hand-mix and efficiently degas the material.
After mixing parts A & B of BLUESIL RTV 3722 A&B it is recommended to degas the product to eliminate the entrapped air introduced in the mixture. This operation is generally possible only if the product is retarded by means of temperature drop or addition of retardant BLUESIL RTRD PA 40, because the pot-life of BLUESIL RTV 3722 A&B is very short (3 min.).
BLUESIL RTV 3722 A&B can be degassed under a 30 to 50 mbar vacuum. When the vacuum is applied the product expands 3-4 times its initial volume and bubbles form on the surface. Once bubbles disappear, the mixture collapses back to its initial volume. To complete degassing simply wait few minutes before releasing the vacuum, then the product will be ready to use.
Remark: pull and release the vacuum several times improves the degassing. For easier degassing only fill a recipient to 1/3 of its height.
Without retarding, the product is usually processed using an automatic dosing machine with a static mixer, after degassing previously each of the two parts, so that no air is introduced during the mixing
3. Cross linking
At room temperature () BLUESIL RTV 3722 A&B cures in the given demolding time regardless of the mold thickness. For best results the mold should be allowed to fully cure for 24h before using it for production.
Room temperature curing assures the lowest possible shrinkage, if accelerated cure is desired, mild heat should be preferred. To minimize shrinkage, the elastomer can be cured at temperature of , higher temperatures might cause higher shrinkage.
Be aware that contact with certain materials can inhibit the curing of this RTV:
- and its derivatives (e.g. sulphur containing clays natural rubbers vulcanized with sulphur).
- Ammonia and amines (e.g. amine cured epoxies, epoxy curing agents).
- Polycondensation RTV catalysed with metal salts.
- PVC stabilizing agents.
- Silver salts.
In case of doubts it is recommendable to run a quick test with a small quantity of material in order to assess compatibility. Take note that cross contamination due to not well cleaned tools or devices are frequently the main causes of inhibition. The best way is to use only dedicated gear when processing polyaddition RTV.
|BLUESIL RTV 3722 A may be stored at a temperature between -5 °C/ 23 °F and 30 °C/ 86 °F for up to 12 months from its date of manufacturing.||Please consult the Safety Data Sheet of this product.|
BLUESIL RTV 3722 A
BLUESIL RTV & B is a two component silicone elastomer which cures at room temperature by a polyaddition reaction (1:1 ratio).
2 Part RTV
- Excellent mechanical properties.
- Low viscosity.
- Quick cure at room temperature.
- No release of toxic substances during and after curing.
BLUESIL RTV 3722 A&B is developed to quickly produce a colorless elastomer of very high mechanical properties, that can be used to obtain silicone molds with excellent mechanical resistance.
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