Silicones for epoxy casting resin
Epoxy is very aggressive to silicone. Epoxy resin strongly attacks silicone. Epoxy can be used in all silicones, but if you want to make multiple castings, it is important to choose the right silicone.
Silicone Addition Transparent 15 Normal
✔ Flexible, Strong
✔ Transparent
✔ Shore A 15 (Adjustable)
✔ Low shrinkage (<0.1%)
✔ 60 minutes working time (Adjustable)
✔ Mixing ratio (Weight) 100: 10€ 24,50 € 20,25 Excl. tax
CompareSilicone Addition Transparent 40 Normal
✔ Flexible, Strong
✔ Transparent
✔ Shore A 40 (Adjustable)
✔ Low shrinkage (<0.1%)
✔ 60 minutes working time (Adjustable)
✔ Mixing ratio (Weight) 100: 10€ 24,50 € 20,25 Excl. tax
CompareSilicone Addition Transparent 40 Fast
✔ Flexible, Very fast, Strong
✔ Transparent
✔ Shore (A) 40 (Adjustable)
✔ Low shrinkage (<0.1%)
✔ 2 minutes working time (Adjustable)
✔ Mixing ratio (Weight) 100: 10€ 24,50 € 20,25 Excl. tax
CompareSilicone Addition Transparent 15 Fast
✔ Flexible, Very fast, Strong
✔ Transparent
✔ Shore (A) 15 (Adjustable)
✔ Low shrinkage (<0.1%)
✔ 2 minutes working time (Adjustable)
✔ Mixing ratio (Weight) 100: 10€ 24,50 € 20,25 Excl. tax
CompareElastosil M 4644
✔ excellent resistance to casting resins, such as polyurethanes and epoxies
✔ good fluid
✔ fast and shrink-free curing at room temperature
✔ Slightly oil-bleeding
✔ Shore A hardness (approx. 40)
✔ good transparency of the cured rubber
✔ high tear st€ 47,50 € 39,26 Excl. tax
CompareElastosil M 4670
✔ High-quality silicone from Wacker
✔ Fast and non-shrink curing at room temperature
✔ Shore A 55
✔ Food safe (FDA / BfR compliant)
✔ High tear strength
✔ Stable mechanical properties
✔ Excellent resistance to casting resins€ 281,75 € 232,85 Excl. tax
CompareElastosil RT 623
✔ very good fluidity
✔ high reactivity
✔ fast and shrink-free curing at room temperature
✔ average Shore A hardness (approx. 31)
✔ high tear strength
✔ long-term stability of the hardness€ 39,95 € 33,02 Excl. tax
CompareElastosil M 4641
✔ High-quality silicone from Wacker
✔ Fast and non-shrink curing at room temperature
✔Shore A 43
✔ Transparent
✔High tear strength
✔ Food safe (FDA)
✔ Excellent resistance to casting resins
✔ Very suitable for clear casting resins€ 599,- € 495,04 Excl. tax
CompareElastosil FX 20
✔ Safe to use on skin
✔ Very good flow ability and self-deaeration
✔ Shore A 20
✔ Easy to meter and mix due to 1:1 ratio
✔ Short curing time at room temperature
✔ Translucent
✔ Easy to color with common colors for special effect applications
✔ Goo€ 325,- € 268,60 Excl. tax
Compare
All epoxy resins are fairly corrosive to silicone molds.
When using epoxy in a silicone mold, the mold will quickly lose its shine and after a few castings the mold will also "burn" in some places. The silicone mold then becomes brittle and brittle.
How many castings can be made depends very much on:
1) which resin you use exactly, a slow epoxy is usually less aggressive.
2) the hotter it gets, the colder the less corrosive to silicone
3) how big the volume is and how massive the shape is. Large solid shapes become hot and therefore more corrosive.
4) how long the casting stays in the mold. The longer it stays in the mold, the longer it can affect the silicone.