Professional Silicone for Industrial Pad Printing Discover our collection of high-quality pad printing silicones from Wacker Chemie and CHT Group , world leaders in silicone technology. These specialized products are designed for optimal performance in industrial pad printing applications. These silicones are sometimes also called stamp silicones. 📄 Technical Documentation...
✔ Very good flowability and self-deaeration
✔ Very low hardness (Shore A approx. 11)
✔ Good tear strength
✔ Excellent transfer characteristics for printing inks
✔ Antistatic finish
Pourable, addition-curing, two-component silicone rubber that vulcanizes at room temperature.
Main application: Making printing pads, food contact (FDA/ BfR compliant).
✔ 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
✔Antistatic surface
✔Good fluidity
✔High reactivity, even when large amounts of silicone oil are added
✔Fast and shrink-free curing at room temperature
✔Medium hardness (Shore A approx. 31)
✔Excellent mechanical properties
Professional Silicone for Industrial Pad Printing
Discover our collection of high-quality pad printing silicones from Wacker Chemie and CHT Group , world leaders in silicone technology. These specialized products are designed for optimal performance in industrial pad printing applications.
These silicones are sometimes also called stamp silicones.
📄 Technical Documentation
Download our comprehensive product guide for pad printing silicone:
RT 620 (Shore A 17) - Food-safe (FDA-compliant, BfR), ultra-soft for fine details and curved surfaces. Low viscosity, fast curing.
RT 623 (Shore A 31) - Standard pad printing, very good flowability, high reactivity for rapid release. High tear strength, long-term stability.
RT 629 (Shore A 31) - Antistatic for electronic components. Fast static dissipation, turquoise color. Processing time 40 minutes, curing time 3 hours.
🔬 CHT SilSo Print Series
SilSo Print 21006 (Shore A 12) - Antistatic, very soft for the finest details. Mixing ratio 1:1 (simple). Platinum addition, minimal shrinkage. Ideal for electronic components.
SilSo Print 21001 (Shore A 30) - Two-component platinum-addition silicone elastomer for professional pad printing applications. Reliable performance.
SilSo Print 21009 (Shore A 6) - Antistatic, extra soft for ultra-fine details. Mixing ratio 1:1 (simple). Platinum addition, minimal shrinkage (<0.1%). Hot pink color. Ideal for delicate surfaces and the finest printing.
SilSo Print 21004 (Shore A 40) - Antistatic printing pads with high hardness. Castable, addition-cured. Excellent wear resistance for high-volume production.
⚙️ Wacker vs CHT - Key Differences
Wacker: Mixing ratio 9:1 or 10:1, Shore A 17-31, food-safe options (RT 620), antistatic (RT 629), FDA-compliant.
CHT: Mixing ratio 1:1 (simpler), Shore A 12-40 (broader), platinum addition, antistatic (21006 and 21004), wide hardness range.
🎯 Choice guide
Food packaging: Wacker RT 620 (FDA-compliant, Shore A 17) Electronic components: Wacker RT 629 or CHT 21006/21004 (antistatic) Very fine details: CHT SilSo Print 21006 (Shore A 12, 1:1 mix) Standard pad printing: Wacker RT 623 or CHT 21001 High volume: CHT SilSo Print 21004 (Shore A 40, abrasion resistance)
📋 Processing guidelines
⚠️Important: Only process components A and B with the same lot number together!
Surface: Clean and free of inhibitors (sulphur, plasticisers, urethanes, organometallics). Mixing: Mix thoroughly in the recommended ratio. A mechanical mixer is recommended. Bleeding: Vacuum 30-50 mbar, 5-10 minutes. Curing: Room temperature 20-25°C, can be accelerated by heat. Shore adjustment: Add silicone oil (5-30%) for lower hardness.
💡 Expert Advice
Our team is happy to assist you with product advice, shore hardness selection, technical data sheets (TDS/MSDS), processing advice, sample materials, bulk pricing, and advice on antistatic or magnetizable properties.
Elastosil RT Silicone Rubber For Pad Printing (PDF)