Silicone, casting rubber

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    Condensation Silicone rubber

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    Fillers, Primers & Additives

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What is silicone rubber?

Casting rubber is a castable material that exhibits rubber-like properties after curing. This often refers to silicone rubber – also known as Liquid Silicone Rubber (LSR) or PDMS (polydimethylsiloxane).

Silicones retain their properties at both low and high temperatures, last longer than natural rubber, and are more resistant to chemicals.

At Silicones and More, you'll find a wide range of silicone casting rubbers for molds. These are categorized by chemistry into condensation-curing RTV silicone (tin cure) and addition-curing RTV silicone (platinum cure) .

Main applications of LSR/PDMS

  • Silicone mold making for polyurethane resin, epoxy resin, polyester, plaster, wax, concrete
  • Bodycasting & lifecasting (skin contact; choose the right line)
  • Sculpture , art reproduction, SFX & prop making
  • Culinary molds (food-safe lines available)
  • Electronics potting , optical components & prototyping

Why choose our silicone rubber

  • Professional quality with clear documentation and practical advice
  • Stable performance over a wide temperature range; predictable curing
  • Food contact and skin friendly in specific additive lines
  • Wide hardness range : from very soft gels to hard qualities
  • Excellent tear strength and chemical resistance

Addition vs. Condensation RTV Silicone

Condensation Silicone (Tin Cure)

Simple explanation: Tends to shrink slowly over time (≈1%/year). Not food-safe; generally cheaper and easier to process.

Good choice: for general molds without food contact.

  • Form chains with by-products (condensate)
  • Separate tin salts
  • Moisture accelerates curing
  • Bonding to fresh condensation silicone

Addition Silicone (Platinum Cure)

Simple explanation: Very low shrinkage after curing. Can be inactivated by sulfur, amines, nitrogen/metal salts, etc. → always perform a small test first.

More sustainable: in use; available in food/skin-safe lines.

  • Polymerization without by-products
  • Virtually no shrinkage
  • Sensitive to pollution/inhibition
  • Post-curing can improve properties

Resistance to chemical and contamination

After curing: Addition systems are generally more resistant to chemicals and aggressive resins than condensation systems.

During curing: Condensation systems tolerate contamination better; addition requires clean tools/masters.

Mixing ratios: Condensation is more tolerant; addition requires accurate weighing (deviations may block curing).

What is PDMS (Polydimethylsiloxane)?

PDMS is the base polymer of most silicone rubbers. In cosmetics, it's often called dimethicone. In molds, we usually refer to it as liquid silicone rubber (LSR) or RTV silicone.

Are you looking for silicone spray rubber for cars or RTV sealant? These are separate product lines/help categories.

Processing tips (RTV Silicone)

  • Masters clean & sealed; use a compatible release agent
  • Weigh accurately (especially when adding); mix thoroughly and scrape the sides and bottom of the cup
  • Vacuum bleed if possible; otherwise pour a thin, continuous stream from one corner
  • Build up brush-on forms in thin layers for even cure & strength
  • Monitor climate (T/RV) according to datasheet; allow to harden completely

Product overview

Condensation-curing silicone (RTV tin cure)

Addition-hardening silicone (RTV platinum cure)

Getting started

Order liquid silicone rubber (LSR/PDMS) and silicone rubber mold sets. Compare addition and condensation properties, download datasheets, and contact our team for friendly expert advice!

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