H.B. Fuller 1581

H.B. Fuller 1581 is a one-component, alcohol-cured RTV silicone sealant. A non-sag material with excellent heat resistance for use in industrial and electronics applications. 1581 has very good adhesion to a wide range of unprimed substrates. High performance with fast and excellent adhesion to glass, aluminum alloys, etc. It can be used for a variety of electronics bonding, encapsulation, and sealing applications. This material is certified by UL to pass HB flame rating testing. This material performs at temperatures ranging from -55°C to 210°C.

Product Type: 1K (1 component) Sealant, Encapsulant

Application Area: Appliances, Batteries, Battery Packs, Blades, Edge Gluing, Electric Vehicle (EV), Electrical Boxes, Electronic Components, Encapsulant, Energy Storage, Frame Sealing, Glass Surface, HVAC Applications, Ingot Bonding, Junction Boxes, Lithium-Ion Battery, Module Installation, Rail Bonding, Solar Cell, Turbines

Compatible Substrates & Surfaces: Glass

Chemical Family: Silicones, Siloxanes

Features: Excellent Performance, Good Sagging Resistance, Good Weather Stability, Heat Resistance, UV Resistant

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Labeling Claims

Applications & Uses

Compatible Substrates & Surfaces
Cure Method
Curing Conditions

Cure speed will vary with temperature, relative humidity, depth of material and presence of moisture. Some applications may require special surface preparation. At 21 - 25°C, 45 - 55% relative humidity, typical cure depth is 2mm in 24 hours. Requires more time to cure in colder or lower humidity conditions.

General Instructions
  • For best performance bond surfaces should be clean, dry and free of any contaminants and oils.
  • Apply a continuous and even bead of silicone to one surface.
  • Assemble parts immediately. Remove excess material at once.


Electrical Properties
ValueUnitsTest Method / Conditions
Volume Resistivity3.0 x 10¹⁵Ω.cmIEC60093, GB/T1692
Breakdown Voltage20.0kV/mmIEC 60243-1, GB/T1695
Cured Properties
ValueUnitsTest Method / Conditions
Elongation at Break (21 - 25°C, 50% RH)380.0%-
Lap Joint Shear Strength (at 21 - 25°C, 50% RH, Aluminum)1.2MPa-
Hardness (at 21 - 25°C, 50%Rh)37.0--
Tensile Strength (at 21 - 25°C, 50% +RH)2.1MPa-
Thermal Service Range- 54 - 210°C-
Damp Heat Aging Test Properties
ValueUnitsTest Method / Conditions
Tensile Strength (at 21 - 25°C, 50% +RH)1.3MPaISO37, GB/528
Elongation at Break (at 21 - 25°C, 50% RH)300.0%ISO37, GB/528
Uncured Properties
ValueUnitsTest Method / Conditions
Tack Free Time15.0min-
Full Cure Time (21 - 25°C, 45 - 55% RH, min. 2mm)24.0h-

Regulatory & Compliance

Certifications & Compliance

Packaging & Availability

Regional Availability
  • Africa
  • Asia Pacific (Excluding Russia)
  • Europe (Excluding Russia)
  • India
  • Latin America
  • Middle East
  • North America
Packaging Information

310ml Cartridge

Storage & Handling

Storage Condition

Product shall be ideally store in a cool, dry area in unopened containers. Material should be stored at a temperature of 8 - 25°C. Optimal storage is at the lower half of this temperature. Do not return unused material back into the container.