H.B. Fuller 1527T

H.B. Fuller 1527T is a translucent-colored RTV silicone. It has good weather resistance and excellent electrical insulation properties, being especially resistant to sulfur hexafluoride and transformer oil. Typical applications include electrical insulation, protecting leads from mechanical shock, bonding trim, sealing ductwork, vents, flues, doors, and windows, and sealing and waterproofing of transformers.

Product Type1K (1 component) Sealant, Reactive Sealant

Application AreaHVAC Applications, HVAC Ducts, Junction Boxes, Power Transformers, Vents, Windows

Compatible Substrates & SurfacesGlass

Chemical FamilyPolysiloxanes, Silicones

FeaturesElectrical Insulation Properties, Exceptional UV Resistance, Fast Setting, Good Sagging Resistance, Heat Resistance, High Flexibility, Improved Workability, Low Odor, Room Temperature Curing, Room Temperature Vulcanizing, Waterproofing, 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
Electrical Properties
ValueUnitsTest Method / Conditions
Volume Resistivity5.0 x 10¹⁴Ω.cmIEC60093, GB/T1692
Breakdown Voltage18.0kV/mmIEC 60243-1, GB/T1695
Cured Properties
ValueUnitsTest Method / Conditions
Hardness30.0ISO7619, GB/T 531, Shore A
Tensile Strength (50% RH)1.3MPaISO37, GB/528
Thermal Service Range- 54 - 210°C
Elongation at Break (50% RH)350.0%ISO37, GB/528
Damp Heat Aging Test Properties
ValueUnitsTest Method / Conditions
Elongation at Break (at 175ºC, for 168 hr, 50% RH)320.0%ISO37, GB/528
Tensile Strength (at 175ºC, 168h, 50% RH)1.4MPaISO37, GB/528
Uncured Properties
ValueUnitsTest Method / Conditions
Tack Free Time3 - 15min
Full Cure Time (21 - 25°C, 45 - 55% RH, min. 2mm)24.0h
Rheological Properties
ValueUnitsTest Method / Conditions
ViscosityThixotropic paste

Packaging & Availability

Regional Availability
  • North America
Packaging Information
  • 85ml
  • 310ml

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. Do not return unused material back into the container.