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Addition Cure Silicone Moulding Rubber


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Addition Cure Silicones

Silicone elastomers are designed with either addition (platinum) cure or condensation (tin) cure chemistry. Addition curing systems are 2-part liquid silicones that utilise a platinum catalyst to cure by either room temperature vulcanisation (RTV) or heat to accelerate cure.

It is inaccurate to say one chemistry type is better over the other. Based on application requirements, addition cure silicones feature different properties that may be the most optimal for one’s project needs compared to condensation cure grades.

Addition cure silicones do not produce by-products during the crosslinking (curing) process. The cure chemistry takes place internally, making them ideal for moulds or parts that are manufactured in a sealed environment. Addition cure silicones have very low shrinkage properties with great dimensional stability when exposed to either humidity or heat. This type of chemistry should be considered if the final mould will be stored for long periods of time between use.

Properties include:

  • Extensive range of durometers/hardnesses
  • Compatible with silicone fluids to increase softness
  • Can be heat cured
  • Casting resin resistance
  • Low shrinkage, below 0.1%
  • High tear and tensile strength
  • Good abrasion resistance
  • Excellent dimensional stability resulting in durable moulds
  • Fine detail reproduction
  • Food grades available

Addition cure silicones can be used with various resins and materials including concrete, stone, brick, fibre glass filled resin, polyurethane, polyester, acrylic resin, and even another addition cure silicone.

Applications: General mouldmaking, Prototyping, Dental replication, Food moulding, Architectural replication & sculpting, Composites/fibre glass part production, Tampo pad printing, Special effects, Prosthetics & orthotics

Avoiding inhibition with addition cure silicones

When working with addition cure silicones, it is important to avoid inhibiting the cure process by bringing the uncured material into contact with certain chemical compounds. The poisoning of the cure catalyst stops the crosslinking necessary for the silicone to properly cure. The result of inhibition is tackiness at the pattern interface or a total failure of the silicone to cure.

Materials known to inhibit cure are sulphur-containing modeling clays, natural rubber such as latex and rubber gloves, masking tape, amine or sulphur-containing material, condensation cure (tin-catalysed) silicones, PVC stabilizers, and epoxy resin catalysts.

Catalysts and specialty product enhancers

CHT offers various catalysts and specialty product enhancers for modifying certain physical properties in addition cure silicones:

  • Accelerators to increase the cure speed
  • Pot life extenders allow more time to pour and fill in large/complex moulds
  • Surface coatings to lower the silicone’s surface tension
  • Additives to obtain either thixotropic properties, matte-like finish, a lower viscosity, or a lower durometer

Finding the right silicone for your application is not limited to CHT’s product portfolio. Our technical team will partner with you to either modify specifications in a current product or custom formulate a new one to meet your exact requirements.

For technical assistance or sample requests, please visit our contact page.

Product Listing


Code Description Request Sample TDS SDS
ALPA-LSR 120201 2 part casting compound
ALPA-SIL TRANS HM 2 part Silicone Moulding Rubber
KÖRAFORM A 30151 2 part casting compound
KÖRAFORM A 50 SCHWARZ 2 part casting compound
KÖRAFORM A 50 T 2 part casting compound
KÖRAFORM A 60 2 part casting compound
KÖRAFORM A 69 2 part casting compound
KÖRAFORM A 97084 2 part casting compound
MM730FG 2 part moulding compound
QLE 1050SB Self-Bonding, Addition Cure, One Part Coating
QM 1125 2 part moldmaking material
QM 226 2 part moldmaking material
QM 230 2 part moldmaking material
QM 230F 2 part moldmaking material
QM 231 2 part moldmaking material
QM 232 2 part moldmaking material
QM 2325 2 part moldmaking material
QM 237 2 part moldmaking material
QM 240T 2 part moldmaking material
QM 245 2 part moldmaking material
QM 247 2 part moldmaking material
QM 254 2 part moldmaking material
QM 255 2 part moldmaking material
QM 258 2 part moldmaking material
QM 260 2 part moldmaking material
QM 261 2 part moldmaking material
QM 262 2 Part Mold Making Silicone
QM 262Clear 2 part addition cure MM
QM 263 2 part moldmaking material
QM 264 2 part moldmaking material
QM 264HT 2 part moldmaking material
QM 265 2 part moldmaking material
QM 269 2 part moldmaking material
QM 270 2 part moldmaking material
QM 272 2 part moldmaking material
QM 280 2 part moldmaking material
QM Pt Accelerator Addition cure curing accelerator
QSil 1000 Self-Bonding, One-Part Silicone Elastomer
QSil 207 Two-part Transparent Liquid Silicone Elastomer
QSil 209 Two-part Transparent Liquid Silicone Elastomer
QSil 210 2 part molding material
QSil 211 Transparent Liquid Silicone Elastomer
QSil 212 Two-part Transparent Liquid Silicone Elastomer
QSil 213 Two-part Transparent Liquid Silicone Elastomer
QSil 214 Two-part Transparent Liquid Silicone Elastomer
QSil 216 Two-part Transparent Liquid Silicone Elastomer
QSil 217 Two-part Transparent Liquid Silicone Elastomer
QSil 218 Two-part Transparent Liquid Silicone Elastomer
QSil 219 Two-part Transparent Liquid Silicone Elastomer
QSil 220 Two-part Self-Bonding Transparent Liquid Silicone Elastomer
QSil 222 Two-part Self-Bonding Transparent Liquid Silicone Elastomer
QSil 223 Two-part Transparent Liquid Silicone Elastomer
QSil 229 Two-part Self-Bonding Transparent Liquid Silicone Elastomer
QSil 550 2 part encapsulation and potting silicone
QSil 550F Addition Cure Potting Material
QSil 550LV Addition Cure Potting Material
QSil 550LV AC Addition Cure Potting Material
QSil 550SB Self-Priming Silicone Potting Material
QSil 553 2-Part Encapsulation and Potting Silicone
QSil 553LV 2 part encapsulation and potting silicone
QSil 555 Addition Cure Potting Material
QSil 559 Addition Cure Potting Material
QSil 559FC Addition Cure Potting Material
QSil 562 Addition Cure Potting Material
QSil 563 Addition Cure Potting Material
QSil 567 Addition Cure Potting Material
QSil 568 Addition Cure Potting Silicone
QSil 573 Addition Cure Potting Silicone
QSil 602 Two-part Transparent Liquid Silicone Elastomer
QSil 7720 Addition Cure Potting Silicone
QSil 7760 Addition Cure Silicone Elastomer
QSil Beyond X1 Two-part Self-Bonding Transparent Liquid Silicone Elastomer
QSil PLE Cure Rate Modifier for Platinum Catalyzed Silicone Materials
QVB 701 2 Part Molding Silicone for Reusable Vacuum Bags
QVB 720 2 Part Molding Silicone for Reusable Vacuum Bags
SilSo Food 21931 2 Part addition cure molding rubber
SilSo Print 21002 (ALPA-SIL TD ANTIST. SH. C:20) 2-part silicone moulding rubber
SilSo Print 21003 (ALPA-SIL TD ANTIST. SH. C:30) 2-part silicone moulding rubber
SilSo Print 21004 (ALPA-SIL TD ANTIST. SH. C:40) 2-part silicone moulding rubber
SilSo Print 21005 (ALPA-SIL TD SH. A 12 BLUE) 2-part silicone moulding rubber
SilSo Print 21006 (KÖRAFORM PP 12) 2-part casting compound
SilSo Print 21007 (KÖRAFORM PP 18) 2-part casting compound
SilSo Print 21008 (KÖRAFORM PP 2) 2-part casting compound
SilSo Print 21009 (KÖRAFORM PP 6) 2-part casting compound
SilSo Replicate 21001 (ALPA-SIL 25301) 2-part silicone moulding rubber
SilSo Replicate 21002 (ALPA-SIL 28) 2-part silicone moulding rubber
SilSo Replicate 21003 (ALPA-SIL 32 LM) 2-part silicone moulding rubber
SilSo Replicate 21004 (ALPA-SIL 36202) 2-part silicone moulding rubber
SilSo Replicate 21005 (ALPA-SIL 38201) 2-part silicone moulding rubber
SilSo Replicate 21006 (ALPA-SIL 40201) 2-part silicone moulding rubber
SilSo Replicate 21007 (ALPA-SIL 97056) 2-part silicone moulding rubber
SilSo Replicate 21008 (ALPA-SIL 97171) 2-part silicone moulding rubber
SilSo Replicate 21009 (ALPA-SIL CLEAR) 2-part silicone moulding rubber
SilSo Replicate 21011 (ALPA-SIL MF 10) 2-part silicone moulding rubber
SilSo Replicate 21012 (ALPA-SIL MF 3) 2-part silicone moulding rubber
SilSo Replicate 21013 (ALPA-SIL MINT) 2-part silicone moulding rubber
SilSo Replicate 21014 (ALPA-SIL TRANS ÖLEND) 2-part silicone moulding rubber
SilSo Replicate 21015 (KÖRAFORM A 28) 2-part casting compound
SilSo Replicate 21016 (KÖRAFORM A 35) 2-part casting compound
SilSo Replicate 21017 (KÖRAFORM A 40) 2-part casting compound
SilSo Replicate 21018 (KÖRAFORM A 42) 2-part casting compound
SilSo Replicate 21019 (KÖRAFORM A 50) 2-part casting compound
SilSo Replicate 21020 (KÖRAFORM A 97014) 2-part casting compound
SilSo Replicate 21021 (KÖRAFORM A 97038) 2-part casting compound
Stretch FX 2 part moldmaking material
Thixo Agent AC Thixotropic Additive for Addition Cure Moldmaking
True Skin 20 Two-part Liquid Silicone Elastomer
True Skin 30 Two-part Liquid Silicone Elastomer
VBS26-35 2 part moulding compound