PlatSil FS-10 -Platinum Silicone-

PlatSil FS-10 is a translucent platinum (addition) silicone with Shore A13 hardness, formulated to deliver exceptional tear resistance along with a very fast cure cycle. It mixes in equal parts by weight and by volume (1A:1B), simplifying workshop use and reducing errors. Its translucent nature once cured makes it a particularly practical choice for molds requiring post-cure cutting or parts with complex geometries where verifying complete fill is essential.

Technical specifications

What it's used for

PlatSil FS-10 is a general-purpose casting silicone aimed at professionals and workshops that need short cycle times without sacrificing mold durability. Its translucency and pre-gel behaviour — which prevents sagging — also make it suitable for brush application when thickened with a thixotropic agent. Common applications:

• Casting molds for reproducing decorative, sculptural and craft pieces
• Molds for complex parts where translucency allows verification of complete fill
• Molds intended to be cut after curing, as the model remains visible through the silicone
• Short and medium production runs where a fast cycle between castings is required
• Brush application after thickening with PlatThix for layer-built coating molds
• Special effects and low-hardness prosthetics that do not require ultra-soft Shore values
• Molds for polyurethane resins, epoxy resins and plaster

How to use it

1. Prepare the model. Make sure the surface is clean, dry and free of inhibiting contaminants (sulfur, latex, uncured epoxy, vinyl). Apply a release agent if the model material requires it.
2. Weigh or measure the components. Mix 100 parts of component A with 100 parts of component B, both by weight and by volume. Use a precision scale for best results.
3. Mix for 2–3 minutes. Stir slowly and evenly with a spatula, scraping the sides and bottom of the container thoroughly to avoid uncatalyzed areas.
4. Degas if you have a vacuum chamber. A brief degassing (1–2 min) removes bubbles introduced during mixing and improves the surface definition of the mold.
5. Pour or apply within the first 8 minutes. Pour the silicone from a low point in the mold so air rises in a controlled manner. If brush-applying, lay the first coat immediately.
6. Allow to cure without moving the mold. At 25 °C full cure occurs in approximately 25 minutes. Do not force demolding ahead of time.
7. Demold carefully. The high tear resistance of PlatSil FS-10 allows complex demolds without risk of tearing, but work with smooth, even movements.

Usage tips

Temperature and working time

The 8-minute working time is measured at 25 °C. At higher temperatures curing accelerates and you will have less handling time; below 20 °C the process slows down. In summer or in warm workshops, slightly chill the components before mixing to gain extra time. Never heat the components to speed up curing: this increases the risk of bubbles and reduces surface definition.

Thickening for brush application

PlatSil FS-10 is a casting silicone, but it can be made brushable by adding PlatThix (thixotropic agent for platinum silicones) after mixing the two components. The thixotropic agent only modifies viscosity and does not alter cure time. Add it gradually until the desired consistency is reached, stirring gently to avoid incorporating air.

Storage and shelf life

Keep containers tightly closed in a cool, dry place away from heat sources and potential contaminants. Once opened, component B (platinum catalyst) is especially sensitive to cross-contamination: use clean, dedicated spatulas for each component. If the containers have been open for a long time and you notice that the silicone is not curing correctly within the stated times, discard the batch and use fresh material.

Frequently asked questions