H.B. Fuller 1536

H.B. Fuller 1536 is a gray, flowable, one-component, neutral alkoxy-cure silicone sealant. Low-odor, solvent-free materials cure at room temperature when exposed to moisture in the atmosphere. With fast tacky-free time and meets the UL94-V0 flame rating. Excellent adhesion to glass, ABS, FR4, and PCBs. Superior resistance to thermal cycling, damp heat, and damp freezing Typical applications include electronics encapsulation, connector staking, electronics potting, circuit board encapsulation, electrical component reinforcement, electronic component bonding, and sealing.

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

Application Area: Appliances, Circuit Substrates, Connectors, Electrical Design Laboratories, Electronic Components, HVAC Applications, HVAC Ducts, Power Transformers, Vents, Windows

Compatible Substrates & Surfaces: Glass

Chemical Family: Polysiloxanes, Silicones

Features: Electrical Insulation Properties, Enhanced Damp Proofing, Heat Resistance, Improved Workability, Low Odor, Thermal Cycle Resistance, Waterproofing

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Features & Benefits

Applications & Uses

Application Area
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 quickly.


Physical Form
Electrical Properties
ValueUnitsTest Method / Conditions
Volume Resistivity1.0 x 10¹⁴Ω.cmIEC60093
Breakdown Voltage15.0kV/mmIEC 60243-1
Technical Data
ValueUnitsTest Method / Conditions
Viscosity15,000 - 30,000cP-
Specific Gravity1.21--
Cured Properties
ValueUnitsTest Method / Conditions
Thermal Service Range- 54 - 210°C-
Hardness35.0-ISO7619, Shore A
Tensile Strength (at 21 - 25°C, 50% RH)1.5MPaISO37
Elongation at Break (21 - 25°C, 50% RH)150.0%ISO37
Lap Joint Shear Strength (at 21 - 25°C, 50% RH, Aluminum)0.5MPaISO4587
Uncured Properties
ValueUnitsTest Method / Conditions
Tack Free Time5 - 20min-
Full Cure Time (min. 2mm)24.0h-

Packaging & Availability

Regional Availability
  • 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. Do not return unused material back into the container.