P525 PlatSil Silicone
P-525 is a platinum-cured, room temperature curing (RTV), silicone rubber designed for the manufacture of high-performing, flexible molds. This two-part (Catalyst & Base), liquid silicone rubber has a Shore Hardness of A25, a pour time of ~15 minutes, and a demold time of ~4 hours.
P-525 molds are commonly used to cast the following materials:
- Urethane (polyurethane) plastic and rubber
- Plaster
- Polyester Casting Resin
- Cement, Concrete
- Epoxy
- Soap
- Wax
- Low-Melt Metals
Release agent is not necessary for casting most materials into P-500 Series molds, but for longer mold life with epoxy, polyurethane or polyester resins, a barrier coat or release agent (SupraLease PTR) is recommended.
This is a pourable rubber, but it can be easily thickened with silicone thickener for brush-on application.
FOR INDUSTRIAL/PROFESSIONAL USE ONLY.
Physical Properties
| Type | Platinum-cured (addition-cure) |
| Mix Ratio by Weight | 1 Part Catalyst : 1 Part Base |
| Shore Hardness | A25 |
| Pot Life | 15 min. |
| Demold Time @ 77°F | 4 hr. |
| Cured Color | Blue |
| Mixed Viscosity | 3,400 cP |
| Specific Volume | 24.7 in³/lb |
| Specific Gravity | 1.12 |
| Tensile Strength | 485 psi |
| Elongation | 440 % |
| Die B Tear Strength | 165 pli |
| Die T Tear Strength | 39 pli |
CURE INHIBITION: Contamination from amines, sulfur, tin compounds, polyester resins, some paints and some silicone rubbers may inhibit surface cure of this product. Perform a test cure on an identical surface to determine that complete curing and good release are obtained.
Product Literature
Technical Bulletin: Magikmold® P-500 Series Technical Data Sheet
Safety Data Sheet: Magikmold® P-525 Catalyst & Base
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