Curing Agent 83 is the specific catalyst for Silastic 3483 silicone, designed for tin-cure (condensation) systems. With 90 minutes of working time and demoulding at 24 hours, it is the ideal choice when you prioritise quality and precision over speed, without compromising the final result of your mould.
Technical specifications
| Parameter |
Value |
| Compatible product |
Silastic 3483 |
| Working time (pot life) |
90 minutes |
| Demoulding time |
24 hours |
| Cure type |
Condensation (tin) |
What it is used for
Curing Agent 83 is designed for jobs where extended working time is a real advantage: complex pieces, large volumes, or situations where no vacuum chamber is available. The 90-minute pot life allows you to work without rushing, degas the mixture more effectively, and ensure complete impregnation of the model before curing begins.
- Manufacturing silicone moulds for casting resins and polyurethanes
- Reproduction of artistic pieces, sculptures and industrial prototypes
- Moulds for special effects and character work in film, theatre and television
- Block molds and jacket molds where long working time is required
- Processes without a vacuum chamber, taking advantage of the extra time for natural bubble evacuation
- Large surface pieces where time is needed to distribute the silicone thoroughly
How to use it
- Prepare the model to be moulded and, if the surface requires it, apply a coat of Ferosil V 32 as a release agent. Allow to dry before proceeding.
- Weigh the required amount of Silastic 3483 for your casting.
- Add Curing Agent 83 in the ratio indicated by the manufacturer for Silastic 3483 and mix with slow, folding movements to avoid incorporating air.
- If you need a thicker consistency for application on vertical surfaces or complex geometries, add Thixo Additive before pouring.
- For greater precision when measuring the catalyst, use a syringe dispenser.
- Pour the mixture over the model in a continuous stream from the lowest point to encourage bubble release. You have 90 minutes to work comfortably.
- Allow to cure at room temperature for 24 hours before demoulding.
- Demould carefully and clean the mould with water and mild soap if necessary.
Usage tips
Precise catalyst dosing
With tin-cure systems, the amount of catalyst directly influences the final properties of the mould. Accurate dosing is essential to obtain consistent results. Use a syringe dispenser to measure the catalyst precisely, especially in small batches where errors are amplified.
Make the most of the working time
The 90-minute pot life is an advantage you should manage well. If you don't have a vacuum chamber, mix slowly for at least 3–4 minutes to reduce air incorporation and let the mixture rest for a few minutes before pouring. This allows the larger bubbles to rise to the surface on their own. On large-volume pieces, the extra time will allow you to fill cavities and corners without rushing.
Temperature and workshop conditions
Ambient temperature affects the cure time of condensation silicones. At lower temperatures (below 18 °C), the process slows down and it may be necessary to wait more than 24 hours before demoulding. At higher temperatures, curing accelerates slightly. Work ideally between 20 and 25 °C to obtain the stated times. Avoid cold draughts directly on the mould during curing.
Frequently asked questions
Can I use this catalyst with other condensation silicones?
Curing Agent 83 is specifically formulated for Silastic 3483 silicone. Using it with other bases may give unpredictable results: incomplete cures, variations in hardness, or incorrect working times. If you are working with another condensation base, consult the appropriate catalyst for that specific product.
What happens if I add more catalyst than recommended?
Adding more catalyst than recommended does not significantly speed up curing and can negatively affect the properties of the final mould: increased brittleness, variations in hardness, and possible migration of catalyst to the surface. Always respect the ratio indicated for Silastic 3483.
Can I speed up demoulding by applying heat?
With condensation silicones such as Silastic 3483, a slightly elevated temperature (30–35 °C) can reduce cure time somewhat, but not dramatically. If you need much faster demoulding, consider Curing Agent 81 VF, which is specifically designed for fast cures.
Do condensation silicones inhibit curing with certain materials?
Condensation (tin) silicones are considerably more tolerant than addition silicones when it comes to inhibition. They do not present the inhibition problems characteristic of platinum silicones with sulphur or other reactive materials. This makes them a robust choice for moulding over a wide variety of materials without special precautions.
Can I add thixotropic additive without altering the cure time?
Yes. Thixo Additive only modifies the viscosity and consistency of the mixture to prevent it from running on vertical surfaces. It does not affect the working time or cure time, which remain as stated for Curing Agent 83 with Silastic 3483.
Is it necessary to use a release agent with this silicone?
It depends on the material of the model. Cured Silastic 3483 generally does not adhere to metals, plaster, lacquered wood, or plastics. However, on porous surfaces (untreated wood, plaster, gypsum) or certain soft plastics, applying a coat of Ferosil V 32 ensures a clean release and protects the original model.
How many uses can a silicone mould made with this combination withstand?
Mould durability depends on the material being cast, the geometry, and the care taken during demoulding. With polyurethane resins or plaster, a properly made Silastic 3483 mould can withstand dozens or even hundreds of castings. Using a release agent between uses and storing the mould in a cool, dark place considerably extends its service life.
