HN-620/630 A/B is a two-component condensation-cure (tin cure) liquid silicone rubber mixed at 100:2 and cured at room temperature. Made from hydroxyl-terminated polysiloxane, fillers, crosslinker and vulcanization accelerator, it offers good adsorption, 20–40 Shore A hardness options and translucent appearance — an economical industrial-grade mold compound for the building-materials industry (plaster and cement molds) and medium-to-large handicraft reproduction.
| Property | HN-620 A/B | HN-630 A/B |
|---|---|---|
| Color | White / Translucent | White / Translucent |
| Viscosity | 18,000–25,000 cps | 18,000–25,000 cps |
| Density | 1.06 g/cm³ | 1.06 g/cm³ |
| Hardness | 20 Shore A | 30 Shore A |
| Tensile Strength | 3.1–3.6 MPa | 3.4–4.1 MPa |
| Tear Strength | 19.8–24.3 kN/m | 19.8–23.4 kN/m |
| Elongation | 600–720% | 560–630% |
| Linear Shrinkage | ≤0.2% | ≤0.2% |
| Curing Agent Addition | 2–3% | 2–3% |
| Operating / Curing Time | 30–40 min / 3–4 h | 30–40 min / 3–4 h |