Remix each component (A & B) every time before using. Following applies to any version.
1. Mixing of the two components
Add 100 parts of BLUESIL RTV 3542 A to 100 parts of BLUESIL RTV 3542 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 parts A & B it is recommended to degas the product to eliminate the air introduced in the mixture if the material is processed using an automatic dosing machine, each of the two parts has been previously degassed and air is not introduced during the mixing.
BLUESIL RTV 3542 A&B is 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, the product will then be ready to use.
Remark: release the vacuum several times improves the degassing. For easier degassing only fill a recipient to 1/3 of its height.
Pour the degassed material slowly in a steady stream from one edge of the mould box so that the material flows evenly over the model minimizing the entrapment of air bubbles under the flowing rubber.
3. Cross linking
At room temperature (23°C) BLUESIL RTV 3542 A&B cures in approximately 24 hours regardless of the mould thickness. For best results the mould should be allowed to cure for additional 24 hours before using the moulds for production.
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.
Conversely at lower temperature polymerization is much slower, at 20°C 36 hours may be necessary to complete cross-linking.
Be aware that contact with certain materials can inhibit the curing of this RTV:
- Natural rubbers vulcanized with sulphur
- Polycondensation RTV catalysed with metal salts
- PVC stabilizing agents
- Amine cured epoxies
- Sulphur containing clays.
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 is frequently the main causes of inhibition. The best way is to use only dedicated gear when processing polyaddition RTVs.
|BLUESIL RTV 3542 B HV TRANSLUCENT 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 3542 B HV TRANSLUCENT
BLUESIL RTV 3542 A&B is a two component, silicone elastomer which cures at room temperature by a polyaddition reaction (1:1 ratio).
Aiming at satisfying different application requirements, BLUESIL RTV 3542 A&B is available in 3 versions:
- BLUESIL RTV 3542 A&B
- BLUESIL RTV 3542 A&B HV (High Viscosity)
- BLUESIL RTV 3542 A&B QC (Quick Curing)
2 Part RTV
- Excellent reproduction of details
- Good mechanical properties
- Low linear shrinkage
- No release of toxic substances during and after curing
- High resistance to inorganic chemicals and UV rays
- Good release properties with organic resins and gypsum
- High flowability for the standard and QC version or increased viscosity for the HV version
- Possibility to choose longer (standard, HV version) or shorter working time (QC version)
This product is specifically formulated for the production of moulds for manufacturing copies in different materials (resins, gypsum, etc.) when high hardness and good elasticity are required. BLUESIL RTV 3542 A&B can be also used for the production of printing pads or printing rollers.
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