Bluesil RTV 3221
BLUESIL® RTV 3221 (known as RTV 573) – Soft, elastic silicone rubber for durable negative molds and fine structures
HS code:
39100000
Product description
BLUESIL® RTV 3221 is an addition-curing two-component silicone rubber characterized by its particularly soft Shore hardness, high elasticity, and excellent tear resistance. After mixing the A and B components, a rubber-elastic, dimensionally stable material is created with very good separability from the master model and excellent detail reproduction. RTV 3221 is particularly suitable for molds that are frequently demolded or have to reproduce complex geometries—for example, in design replication, small series production, or mold making for plaster, wax, or polyurethanes.
product features
2K silicone system (addition-curing)
Very soft: Shore hardness A approx. 10
High tear and tear resistance
Excellent elasticity and recovery
Shrink-free
Temperature resistance: approx. –140°F to 392°F
Good chemical inertness – also suitable for PU and epoxy resins
Excellent separability and reusability
Mixing ratio A:B = 1:1 (by weight or volume)
Pot life: approx. 30 minutes, demolding after approx. 4–6 hours
Bubble-free casting possible, also suitable for vacuum technology
Suitable materials
Wax, plaster, PU resin
Soap or candle materials
Concrete, polyester (with release agent)
Also suitable for complex models with undercuts
Typical areas of application
Design and decorative shapes
Manufacture of flexible casting molds
Small-batch production in model making
Molded parts for casting resin or polyurethane
Architectural models, artistic replicas, collection of molds
Impression of fine structures and soft model bodies
Processing instructions
Homogenize components A and B separately.
Maintain an exact mixing ratio of 1:1
Mix thoroughly to avoid air bubbles.
If necessary, vent the vacuum.
Pour or spread onto the model – do not work too quickly
Cures at room temperature in approximately 4–6 hours
Curing by heat can be accelerated
Demold after complete cross-linking
Avoid direct contact with substances containing tin, amines, or sulfur.
Storage: cool, dry, in original sealed container
product specifications
| Physical properties | |
|---|---|
| Color | beige |
| density | 1.3 |
| Viscosity mPa·s | 15000 |
| Hardness (Shore A) | 17-18 |
| product information | |
|---|---|
| container | 1 kg or 5 kg or 20 kg or 25 kg or 200 kg |
| manufacturer | Elkem Silicones |
| brand | Bluesil |
| mixing ratio | 100:5 |
| keywords | |
|---|---|
| keywords | |