H.B. Fuller SI120

H.B. Fuller SI120 is a surface-insensitive cyanoacrylate adhesive that is used in applications that require faster cure speeds on parts that are dry and on parts that may be acidic. The SI series bonds a wide range of similar and dissimilar surfaces. This series provides exceptional performance in a wide range of applications.

Product Type1K (1 component) Adhesive, Anaerobic Adhesive

Compatible Substrates & SurfacesFiberglass, Leather, Metal, Plastics, Wood

Chemical FamilyCyanoacrylates

FeaturesFast Cure, Fast Curing, Medium Viscosity

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Ready-to-Use Product Features

Applications & Uses

Compatible Substrates & Surfaces
Cure Method
General Instructions
  • For optimum results parts should be clean and free from any contamination on the bonding surface. If parts do not mate flush together use a higher viscosity product to compensate for the gap.
  • Factors Affecting Cure Speed Include: GAP: Thin bond line results in faster cure speed. Larger gaps will lengthen cure speed. HUMIDITY: Cure and fixture times can be influenced by the humidity conditions at the time of assembly.
  • The higher the RH the faster cure and fixture times will be. Fixture time data based on our testing is conducted at 50% relative humidity.


Physical Form
Clear liquid
Cured Properties
ValueUnitsTest Method / Conditions
Shear Strength (Steel)min. 2100psiISO 4587
Shear Strength (Aluminum)min. 1750psiISO 4587
Shear Strength (Neoprene)min. 750psiISO 4587
Shear Strength (Acrylonitrile Butadiene Styrene)min. 900psiISO 4587
Shear Strength (Polyvinyl Chloride)min. 900psiISO 4587
Shear Strength (Polycarbonate)min. 900psiISO 4587
Shear Strength (Phenolic)min. 850psiISO 4587
Tensile Strengthmin. 1800psiISO 6922
Damp Heat Aging (Strength on PC after 500 hrs, at 40°C, 95% RH)100.0%
Dielectric Constant (at 1kHz)2 - 3.5ASTM D150
Dissipation Factor (at 1kHz)max. 0.02ASTM D150
Volume Resistivity(2 - 10) x 10¹⁵Ω.cmASTM D257
Uncured Properties
ValueUnitsTest Method / Conditions
Specific Gravity1.05
Set Time (Steel)max. 10s
Set Time (Aluminum)max. 10s
Set Time (Neoprene)max. 5s
Set Time (Acrylonitrile Butadiene Styrene)max. 10s
Set Time (Polyvinyl Chloride)max. 10s
Set Time (Polycarbonate)max. 10s
Set Time (Phenolic)max. 10s

Packaging & Availability

Regional Availability
  • Latin America
  • North America

Storage & Handling

Storage Conditions
  • Store product in unopened containers, out of direct sunlight, in a dry location.
  • Material should be stored at or below 22°C.
  • For extended shelf life unopened containers of the product may be refrigerated.