H.B. Fuller 1535

H.B. Fuller 1535 is a one-component, silicone adhesive sealant that cures on exposure to atmospheric moisture to form a silicone elastomer. This material is known for its excellent electrical properties, weather stability, chemical resistance, flame retardancy, and thermal conductivity. It exhibits good adhesion to most common building substrates, such as glass, metal, plastic, FR4, and lead frames.

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

Application Area: Appliances, Connectors, Electric Motors, Electric Vehicle (EV), Encapsulant

Compatible Substrates & Surfaces: Composites, Glass, Metal, Plastics

Chemical Family: Polysiloxanes, Silicones

Features: Chemical Resistant, Excellent Sealing Capability, Flame Retardant, Good Adhesion, Good Electrical Properties, Good Thermal Conductivity, Good Weather Stability, High Flexibility, Low Odor, Waterproofing

Technical Data Sheet
Message our experts with questions
Robert Blackstone avatar

Robert Blackstone

Global Leader - Inside Sales

Please reach out to me with any questions, I am happy to assist you in finding the right product or learning more about our storefront

Enhanced TDS

Identification & Functionality

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.


Physical Form
White thixotropic paste
Technical Data
ValueUnitsTest Method / Conditions
Specific Gravity2.6--
Cured Properties
ValueUnitsTest Method / Conditions
Lap Joint Shear Strength (Aluminum, 50% RH)1.5MPaGB/T 7124
Elongation at Break (50% RH)180.0%GB/T 528
Hardness82.0-GB/T 531, Shore A
Tensile Strength (50% RH)3.5MPaGB/T 528
Thermal Service Range- 54 - 210°C-
Uncured Properties
ValueUnitsTest Method / Conditions
Tack Free Time3.0min-
Full Cure Time (min. 2mm)24.0h-
Rheological Properties
ValueUnitsTest Method / Conditions
ViscosityThixotropic paste--

Packaging & Availability

Regional Availability
  • North America

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 5 - 25°C and shelf life is a one year in original unopened containers.