Energy savings plus mechanical reinforcement and rheology control

2K RTV Silicone Adhesive

Adhesives Formulation

Applicable Type

Reactive Adhesives

Applicable Base Polymer

Silicones (Si)

Applicable Industrial Sectors

Buildings & constructions

Applicable Base Polymer Properties

Silicone polymers display an exceptionally wide range of chemistries and physical properties. These polymers can be low viscosity liquids, crosslinkable elastomers, or hard solids. Adhesives and sealants represent only one major class of commercial silicone products. These versatile materials were introduced approximately 30 years ago and many of the original formulations are still utilized. Two-part condensation cure silanol systems employ ethyl silicates (polydiethoxysiloxanes) such as PSI-021 as crosslinkers and dialkyltincarboxylates as accelerators. Tin levels in these systems are minimally 500ppm, but typical formulations have up to ten times the minimum.

Typical Formulation Ingredients

Ingredient

Parts by weight

Part A:

Silanol fluid (DMS-S45, Geltest)

Silica powder

Ethyl silicate (PSI-021, Geltest)

Part B:

100 cSt silicone fluid (DMS-T21, Geltest)

Silica powder

Tin catalyst, dibutyltin dilaurate (DBTL)

(Source: Gelest)

Typical Properties

Properties

Mix ratio (Part A : Part B) by weight

xxxx

Tear strength, psi

xxxxxxx

Hardness, Shore A

xxxxx

Peel strength, lb / in

xxxxx

Heat resistance, °C

xxx

Processing

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Resulting Properties

RTV silicone sealants offer superior durability in most environments. These materials bond readily to many substrates and provide excellent elongation. They bond well to many low surface energy plastics due to the relatively low surface tension of the RTV silicone formulations. However, RTV silicone products do not have the high degree of tensile strength or tear and abrasion resistance as epoxies and polyurethanes. For this reason RTV silicone formulations are more commonly used as sealants than as adhesives although they are also often utilized as coatings and soft potting compounds.