Following instructions apply for all versions of BLUESIL RTV 3512 A&B.
Remix each of the two components (parts A and B) every time before using.
1. Mixing of the two components
Add 100 parts of BLUESIL RTV 3512 A to 100 parts of BLUESIL RTV 3512 B.
The two components may be intimately mixed either by hand or using a low-speed electric or pneumatic mixer to minimize the introduction of air into the mixture.
After mixing BLUESIL RTV 3512 A&B, it is recommended to eliminate entrapped air. If the processing is done with the help of a machine and a static mixer, the two parts are degassed separately before mixing.
BLUESIL RTV 3512 A&B is degassed under a vacuum of 30 to 50 mbar. Under vacuum, the product expands 3 to 4 times its initial volume and forms bubbles on its surface. These bubbles will disappear gradually and the mixture will sink back down to its initial volume within few minutes. Then the vacuum can be released.
Remark: release the vacuum several times improves the degassing. For easier degassing only fill a recipient to 1/3 of its height.
3. Cross linking
The best curing conditions are at 23°C. The use of the product at higher temperatures will reduce the pot life and increase the setting rate. As opposed to this, lower temperatures will increase the pot life and decrease the setting time.
At 23°C, the cured silicone can be demoulded after the time indicated as "demolding time" (see § 2.Polymerization, pag.1). In order to achieve the best possible performance levels from the molds, it is preferable to wait for 24 hours before using them.
Room temperature curing assures the lowest possible shrinkage, if accelerated cure is desired, mild heat should be preferred. To minimize shrinkage cure the elastomer at maximum temperature of 60°C for 3-4 hours, higher temperatures will cause higher shrinkage.
Be aware that contact with certain materials can inhibit the curing of this RTV:
- Sulphur 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.
If doubts exist it’s recommendable to run a quick test with a small quantity of material in order to assess compatibility. Take duly note that cross contamination due to not well cleaned tools or devices is frequently the main cause of inhibition. The best way is to use only dedicated gear when processing polyaddition RTVs.
|BLUESIL RTV 3512 NB B may be stored at a temperature below 40°C / 104°F for up to 12 months from its date of manufacturing.||Please consult the Safety Data Sheet of this product.|
BLUESIL RTV 3512 NB B
BLUESIL RTV 3512 A&B is a two component silicone elastomer which cures at room temperature by a polyaddition reaction (1:1 ratio). The product is available in following versions:
BLUESIL RTV 3512 A&B (colors ORANGE or YELLOW)
BLUESIL RTV 3512 NB A&B (No Bleeding)
BLUESIL RTV 3512 NB QC A&B (No Bleeding, Quick Curing)
2 Part RTV
• High fluidity.
• Excellent reproduction of details.
• Good mechanical properties and very low hardness.
• Low linear shrinkage.
• No release of toxic substances during and after curing.
• Good release properties with most used reproduction materials.
• Possibility to choose longer (BLUESIL RTV 3512 and BLUESIL RTV 3512 NB version) or shorter working time (BLUESIL RTV 3512 NB QC version).
• Possibility to have silicone-oil free version (BLUESIL RTV 3512 NB and BLUESIL RTV 3512 NB QC).
BLUESIL RTV 3512 A&B is specifically formulated for the production of sock-molds for manufacturing seamless parts in different materials (resins, gypsum, etc.).
BLUESIL RTV 3512 A&B can also be used for printing pads.
BLUESIL RTV 3512 NB A&B is specifically formulated for the production of sockmolds whereas no silicone oil bleeding is required.
BLUESIL RTV 3512 NB A&B can also be used for the production of printing pads or printing rollers.
All grades show a low hardness combined with an excellent mechanical resistance that allows for an easy demolding from complex shapes.
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