World class silicones for worldwide solutions

Condensation Cure Silicone Rubbers


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Condensation Cure RTV Mouldmaking Silicones

RTV silicone moulding rubbers using condentaion cure are either 1-part or 2-part systems that utilise a tin based catalyst to cure. Unlike addition condensation chemistries are not kit matched, and therefore, can be used with either a standard catalyst or a specialty catalyst containing higher tin content to achieve a faster cure speed.

Properties include:

  • Range of durometers/hardnesses
  • Compatible with silicone fluids to increase softness
  • Flexibility with mixing ratios of the base and catalyst
  • Low and high tear strengths available
  • Low shrinkage, below 0.5%
  • Excellent dimensional stability
  • Fine detail replication

CHT’s condensation cure silicones are suitable for use with a variety of casting materials including epoxy, gypsum, polyester, polyurethane, plaster, and wax.

Good tear strength is a key characteristic of mouldmaking silicones, enabling it to maintain its original form and does not easily tear when stretched or pulled. Condensation cure moulding silicones are available with low or high tear strengths to tailor to different application needs.

Low tear RTV silicone moulding rubbers are ideal for basic shapes and parts without deep undercuts, if the mold will not be used to produce a high volume of parts. These low tear grades still provide high-quality part reproduction and contribute to a lower production cost. A few applications examples include sole moulds/masters and leather reproduction.

High tear RTV silicone moulding rubbers benefit applications needing longer mould life, high volume part production, and rigid parts with deep undercuts.

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

Avoiding inhibition with condensation cure silicones

When working with condensation cure silicones, it is important to avoid inhibiting the cure process. 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.

Although cure inhibition is not a common occurrence for condensation cure grades, some sulphur containing modeling clays can slow the cure of condensation RTVs. However, the condensation cure RTV will eventually cure when the clay is removed. Inhibition can be avoided by applying a barrier coat before silicone is applied to the model.

Catalyst and specialty product enhancers

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

  • Fast cure catalysts
  • Additives to obtain a matte-like finish, lower viscosity, or lower durometer
  • Thixotroping agents

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-SIL 18101 2 part Silicone Moulding Rubber
ALPA-SIL 23101 2 part Silicone Moulding Rubber
KÖRAFORM 97036 A 2 part casting compound
KÖRAFORM 97067 A 2 part casting compound
KÖRAFORM 97069 A 2 part casting compound
KÖRAFORM K 12 2 part casting compound
KÖRAFORM K 18 2 part casting compound
KÖRAFORM K 20 2 part casting compound
KÖRAFORM K 27 2 part casting compound
KÖRAFORM K 31 2 part casting compound
KÖRAFORM K 40 / K 40 AZ 2 part casting compound
KÖRAFORM K 50 2 part casting compound
KÖRAFORM K 65 2 part casting compound
KÖRAFORM K 70 2 part casting compound
MM50T 2 part moulding compound
MM709 2 part moulding compound
MM810 2 part moulding compound
MM816 2 part moulding compound
MM820 2 part moulding compound
MM828 2 part moulding compound
MM830 2 part moulding compound
MM850 2 part moulding compound
MM903 2 part moulding compound
MM906 2 part moulding compound
MM911 2 part moulding compound
MM913 2 part moulding compound
MM918 2 part moulding compound
MM922 2 part moulding compound
MM928 2 part moulding compound
MM940 2 part moulding compound
QM 100 2 part moldmaking material
QM 107 2 part moldmaking material
QM 113 2 part moldmaking material
QM 118 2 part moldmaking material
QM 122 2 part moldmaking material
QM 128 2 part moldmaking material
QM 130T 2 part moldmaking material
QM 132T 2 part moldmaking material
QM 135 2 part moldmaking material
QM 140 2 part moldmaking material
QM 2125 2 part moldmaking material
QM 2128 2 part moldmaking material
QM 2223 2 part moldmaking material
QM 2225 2 part moldmaking material
QM 2325 2 part moldmaking material
QM Skin 30 2 part moldmaking material
QSil 12 2 part encapsulation and potting silicone
QSil 13 2 part encapsulation and potting silicone
QSil 40 2 part encapsulation and potting silicone
QSil 440 2 part encapsulation and potting silicone
QSil 58 Condensation cure potting material
QSil 60 Condensation cure potting material
QSil 6101 Condensation cure for potting applications
QSil 960 Condensation cure for potting applications
SE2005 2 part encapsulation and potting silicone
QSil 6201 Condensation Cure Potting Silicone
QM Thixo Agent Thixotropic Additive for Condensation Cure Moldmaking