KBM-303

Shin-Etsu Chemical Co., Ltd.

Shin-Etsu Chemical Co., Ltd. · KBM

KBM-303 is an epoxy-functional silane coupling agent, specifically 2-(3,4-Epoxycyclohexyl)ethyltrimethoxysilane. It improves chemical reactivity, durability, and physical properties in heat-curable systems and thermoplastics. KBM-303 is particularly suited for applications involving fillers, inorganic substrates, and metals in environments requiring enhanced water and weather resistance.

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Specifications

Identifiers

Chemical name
2-(3,4-Epoxycyclohexyl)ethyltrimethoxysilane
CAS number(s)
3388-04-03
EC number
222-217-1
Molecular formula
C11H22O4Si
InChI key
DQZNLOXENNXVAD-UHFFFAOYSA-N
Synonyms
Epoxy Silane Coupling Agent, Trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-3-yl)ethyl]silane, 2-(3,4 Epoxycyclohexyl)ethyltrimethoxysilane

Technical specifications

Properties

PropertyValueUnit
Physical StateLiquid-
ColorColorless, transparent-
OdorSlight odor-
Boiling Point310°C
Vapor Pressure< 1 (at 20 °C)mmHg
Vapor Density8.5 (Air = 1)-
Specific Gravity1.06 (at 25 °C)-
Evaporation Rate< 1 (Butyl acetate = 1)-
Solubility in WaterNot soluble (Hydrolyzed with water)-
Flash Point163 (Open cup), > 94 (Closed cup)°C

Specifications

Test ConditionSpecificationValueUnitTest Method
-AppearanceColorless, transparent--
at 25 °CSpecific Gravity1.065--
-Flash Point146°C-
at 25 °CRefractive Index1.449--
at 0.25 mmHgBoiling Point96°C-
Industries
Adhesives & SealantsCASECarePaints & CoatingsPlastics & Rubber
Product groups
Silane Coupling AgentsSilanes & SiloxanesSilicones
Applications
Industrial coatingsPlastic manufacturingAdhesives & sealants formulations
Functions
Coupling agentAdhesion promoterMonomerCuring agent
Market segments
AdhesivesPlasticsProtective coatings

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