H.B. Fuller 1527B

H.B. Fuller 1527B is a black, medium-viscosity, low-odor, good workability RTV silicone. Cures at room temperature when exposed to moisture. Excellent flexibility, adhesive property, electrical insulation, weather resistance, aging resistance, and thermal cycle resistance 1527B passes FDA 21 CFR 177.2600 and is UL-certified.

Product Type1K (1 component) Sealant, Reactive Sealant

Application AreaAppliances, Glass Surface, HVAC Applications, Lighting Fixtures, Ovens, Solar Cell

Compatible Substrates & SurfacesGlass

Chemical FamilyPolysiloxanes, Silicones

FeaturesElectrical Insulation Properties, Fast Setting, Good Aging Behavior, Good Weather Stability, Heat Resistance, High Flexibility, Improved Workability, Low Odor, Medium Viscosity, Room Temperature Curing, Room Temperature Vulcanizing, Thermal Cycle Resistance, Wide Temperature Operating Range

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Features & Benefits

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
Black thixotropic paste
Electrical Properties
ValueUnitsTest Method / Conditions
Volume Resistivity2.0 x 10¹⁵Ω.cmGB/T1692
Technical Data
ValueUnitsTest Method / Conditions
Specific Gravity1.1
Cured Properties
ValueUnitsTest Method / Conditions
Hardness28.0GB/T 531, Shore A
Tensile Strength (50% RH)1.5MPaGB/T 528
Thermal Service Range- 54 - 210°C
Lap Joint Shear Strength (Aluminum, 50% RH)1.5MPaGB/T 7124
Elongation at Break (50% RH)180.0%GB/T 528
Damp Heat Aging Test Properties
ValueUnitsTest Method / Conditions
Elongation at Break (at 175ºC, for 168 hr, 50% RH)180.0%GB/T 528
Tensile Strength (at 175ºC, 168 h, 50% RH)1.5MPaGB/T 528
Uncured Properties
ValueUnitsTest Method / Conditions
Tack Free Time5 - 30min
Full Cure Time (21 - 25°C, 45 - 55% RH, min. 2mm)24.0h
Rheological Properties
ValueUnitsTest Method / Conditions
Viscosity40,000 - 70,000cP

Regulatory & Compliance

Certifications & Compliance

Packaging & Availability

Regional Availability
  • North America
Packaging Information
  • 310 ml Cartridge
  • 18.0 kg Pail

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.