PlatSil® HTS-25 – High Strength Silicone Casting Rubber for Mold Making & Production
PlatSil® HTS-25 – High Strength Silicone Casting Rubber for Mold Making & Production
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Premium Silicone Casting Rubber for Professional Applications
PlatSil® HTS-25 is a two-component, platinum-catalyzed silicone rubber (RTV) from Polytek Development Corp., specially developed for demanding production environments. With exceptional tear strength, tensile strength, and elongation of over 2,000%, this rubber offers unparalleled durability for repetitive demolding and stretching.
Key Benefits
- Extreme elongation (>2,000%): Ideal for complex geometries and undercuts without the risk of tearing.
- High tear strength (179 pli Die B): Resistant to intensive use in high-volume production environments.
- Excellent release: No release agents are needed in most applications.
- Good chemical resistance: Suitable for casting polyesters, polyurethanes, epoxy, and more.
- No shrinkage during curing: Excellent dimensional accuracy for precision parts.
- Adjustable working time: Compatible with accelerators (Part X) and retarders (Part R).
Typical Applications
- Mold making for polyurethane, epoxy, and polyester casting materials
- Prototyping and industrial design: accurate reproduction of complex models
- Architectural restoration: reproduction of ornamental details in concrete or plaster
- Art casting and sculpture: flexible molds for multiple uses
- Electronics and potting: protection of components in demanding environments
Technical Characteristics
Mix ratio 1A:10B (by weight). Shore hardness A25, mixed viscosity 15,500 cP, pour time 70 minutes, demold time 24 hours at 77°F. Cured color: milky white. Specific gravity 1.11. Can be thickened with PlatThix or Fumed Silica for brush-on applications.
Manufactured by Polytek Development Corp. (Easton, PA, USA) – specialist in professional casting and molding materials for industry, art, and manufacturing.
Professional Support
Do you have questions about the correct application, mixing ratio, or compatibility with your model or casting material? Our technical team is ready to provide tailored advice for your specific project.
Product Properties
- Hardness25Shore AHardness of the silicone material
- Shrinkage0.0%Linear shrinkage after curing
- ColorMilk whiteColor of the finished product
- TransparencyOpaqueDegree of transparency
- Viscosity15500mPa·sViscosity of the uncured silicone
- Density1.11g/cm³Density of the cured material
- Mix ratio1:10Mixing ratio A : B
- Tensile strength4.45MPaMaximum tensile force before breaking
- Tear strength31.3kN/mResistance against tearing
- Elongation at break2000%Maximum stretch before breaking
- Pot life70minutesWorking time after mixing
- Cure time1440minutesTime until full cure
Component Properties
- Color AClear/transparentColor of component A
- Color BMilky white/translucentColor of component B
- Viscosity A1200mPa·sViscosity of component A
- Viscosity B28000mPa·sViscosity of component B
- Density A0.96g/cm³Density of component A
- Density B1.12g/cm³Density of component B
Electrical Properties
- Electrically insulatingYesPrevents electric current flow
Certification & Safety
- Chemical resistanceGoodResistance to chemicals
- Moisture resistantYesResistant to moisture and water absorption
Application
- Use caseDie & mould makingIntended use
- Silicone type["Addition curing","RTV-2"]Type of silicone or polymer
- Cure speedNormalHow quickly the material can be demoulded
Safety Information
According to Polytek's European safety data sheet, component A is classified as harmful to aquatic life with long lasting effects (H412). There is no signal word and no hazard pictogram. Component B is not classified as hazardous. Avoid release to the environment and dispose of residues and packaging via an approved waste disposal company. Wear nitrile gloves and eye protection when working with the product and make sure there is good ventilation. Always consult the supplied safety data sheet (SDS) for full information on hazards, handling, storage and first aid.| Safety Pictograms | Safety Data Sheets (SDS) |
|---|---|
GHS hazard pictograms
Required protection (ISO 7010)
  |
| Signal Word | H‑code | Hazard Statement | P‑codes | P‑statements |
|---|---|---|---|---|
| Warning | Causes serious eye irritation | - | - | |
| Warning | Causes skin irritation | - | - |
Technical data sheets
Frequently asked questions
What is the delivery time for my order?
Orders placed and paid on working days are in most cases shipped the same day. Weekend orders are processed on the next working day.
Indicative delivery times: Netherlands usually within 1 working day, Belgium and Germany typically 1–2 working days, other countries depending on destination and carrier. These are guidelines, not guarantees: peak periods, public holidays or carrier delays can have an effect.
What is the return policy?
You have 30 days to return after receipt. Email info@siliconesandmore.com within 30 days of delivery with your name and order number. The full conditions are in our return policy.
How can I track my order?
As soon as your order has shipped, you'll receive a track & trace code by email. It can take up to 24 hours before the code is active.
I have a problem with my order – how do I reach you?
Contact us via our contact page or email info@siliconesandmore.com. We're happy to help you quickly.
Can I order as a business?
Yes. Apply for a business account; we review your application within 3 working days. After that you order while logged in and pay on invoice, with payment terms of 14 days after delivery.
EU businesses outside the Netherlands with a valid VAT number order with VAT reverse-charged (0%, intra-community supply). The VAT number is stored in your business account; it cannot be added to an order after it has been placed.