Calsil RTV PC 30
Pourable 2K RTV silicone with Shore A 30.
Castable 2K-RTV silicone (Sn-polycondensation) with Shore A 30 — standard hardness choice for general mold tools in model making and reproduction
Internal reference:
70-3020.K020
Calsil RTV PC 30 is a pourable 2K-RTV silicone (Sn-polycondensation) with Shore A 30 — the standard hardness choice for general mold tools in model making and reproduction.
This product line comprises 2K polycondensation silicone elastomers (tin-catalyzed) for mold making — established, economical industrial chemistry with good substrate compatibility, especially for lost wax, decoration, and construction. Calsil PC 30 is tailored to specific industrial applications — the key properties and areas of application are listed below.
Calsil RTV PC 30 is a condensation-curing RTV-2 silicone casting compound with Shore A 30 — the universal medium-hard choice for mold tools in model making, decoration, and industrial reproduction. Detailed mechanical values available on request via SILITECH.
What sets Calsil PC 30 apart
What is Calsil PC 30 used for?
Processing
Recommended accessories
Important Notes
Calsil PC 30 compared with related RTV products
Crosslinking system, mechanics, and processing times directly side by side — all values from the official Elkem-TDS. “— " = not specified in the data sheet.
Calsil PC 30 Current Product |
RTV 3325 → | RTV 3318 SPU → | Calsil PC 55 → | |
|---|---|---|---|---|
| Crosslinking system | 2K Condensation (Sn) | 2K Condensation (Sn) | 2K Condensation (Sn) | 2K Condensation (Sn) |
| Mixing ratio | with CATA | 100 : 5 (Cata) | 100 : 5 (CATA SPU) | with CATA |
| Color | — | White | White | — |
| Shore A hardness | A 30 | A 25–28 | A 18 | A 55 |
| Elongation at break | — | 440–490 % | 520 % | — |
| Tensile Strength | — | 4–4.3 MPa | 3.3 MPa | — |
| Tear strength | — | 21–26 kN/m | 19 kN/m | — |
| Pot life | — | 90–150 min (Std) | 90–150 min | — |
| Demolding time | — | 24 h (Std) / 6 h (Fast) | 24 h | — |
| Mixed viscosity | — | 35'000 mPa·s | 25'000 mPa·s | — |
| Main application | Model-making molds | Wax burnout molds | Polyurethane casting resin molds | High-stress mold tools |
Technical data for Calsil RTV PC 30
| Product Information | |
|---|---|
| Container | 20 kg |
Please refer to the technical data sheet (TDS) in the "Documents" tab for binding values.
No public documents available.
On request, we will gladly send you TDS and SDS by email, Submit request.
Frequently asked questions about Calsil PC 30
Practical processing and design questions — answered by SILITECH.
Calsil RTV PC 30: Pourable 2K-RTV silicone (Sn polycondensation) with Shore A 30 — standard hardness choice for general mold tools in model making and reproduction. Main applications are model making molds, industrial reproduction, decorative replicas.
Polycondensation curing is a 2-component silicone chemistry with a tin catalyst. When mixed, the components crosslink, releasing alcohol as a byproduct — this can lead to low linear shrinkage (typically <0.7 %). Advantage: Polycondensation silicones are less sensitive to inhibitors than polyaddition systems — they also crosslink in contact with sulfur-vulcanized rubber and are tolerant of many substrates. Established, economical industrial standard for lost wax casting, decorative reproduction, and construction.
Thoroughly stir components A and B before each processing step. Dose precisely according to the mixing ratio specified in the TDS (see comparison table above) — preferably by weight. Mix with an electric or pneumatic stirrer at low speed (minimize air entrainment). Degas the mixture under vacuum (30–50 mbar) — the material expands to 3–4 times its volume, bubbles escape, and the material settles back after 5–10 minutes. Then pour slowly into the mold from the lowest point to avoid air entrapment. For polyaddition systems, avoid contact with inhibitors (sulfur rubber, tin RTV, amine epoxides, PVC with tin salts).
Store in unopened original container in a dry, cool place — typically between +5 and +30 °C, exact values see TDS. Store components A and B separately; after opening, seal airtight. Polyaddition systems are insensitive to moisture, but should be stored cool to preserve pot life. Consult the Safety Data Sheet (SDS) before use.
In the comparison table above, you will find related RTV products with different hardnesses, pot lives, or application profiles. If you are unsure about the optimal choice, we will be happy to advise you — contact SILITECH with your application (substrate, desired hardness, processing time, requirements for mechanical properties and resistance).
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Product Specifications
| Container | 20 kg |
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