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RTV Liquid Rubber
These polyurethane liquid mold rubbers are soft to mid-range hardness, high-performance, room temperature curing systems. They offer superior flexibility and toughness allowing durable molds to be made from relatively simple to the most highly detailed, undercut and complex models. The 74-Series liquid mold rubbers are supplied as pourable liquids so poured block and blanket molds can be made with ease; thickening agent can be easily added to make brush-on molds.
Choose from 16-pound or 80-pound kit.
- Shore A20 to A55 hardness liquid mold rubbers.
- High-strength, abrasion-resistant, longest lasting molds.
- Reproduces fine details.
- Pourable or brushable (see “Thickeners” under “Accessories” for brushing).
- Can be accelerated for rapid cure.
- Economical & versatile.
- Ideal for the most demanding mold making applications.
- All rubbers can be demolded after ~16 hours
- Precast concrete casting.
- Architectural GFRC.
- Plaster casting.
- Art foundries.
- Sculpture and décor reproduction.
- Numerous hobby, craft, prop and display mold making and casting projects.
- View more applications in the 74-Series product photo gallery.
| Mix Ratio | Shore Hardness | Pour Time | Cured Color |
|---|---|---|---|
| 1A:1B by weight | A25 | 20 min | Amber |
| Mixed Viscosity | Specific Volume | Demold Time | Shrinkage Upon Cure |
|---|---|---|---|
| 2,000 cP | 27.5 in³/lb | ~16 hr. | Nil |
*Shrinkage is primarily caused by gelling while hot then cooling. Parts that cure with minimal temperature rise exhibit minimal shrinkage.
Product Literature: Technical Bulletin | Safety Data Sheets | Physical Properties Bulletin | Sealer & Release Agent Selection Guide
Video Tutorials: For Poly 15-Series video tutorials, visit the Poly 15-Series page or the Polytek YouTube Channel.
The color of polyurethane Part Bs may change in color from batch to batch or may darken with age, but product performance is not affected. For additional physical property specifications, refer to the Physical Properties Bulletin.
