Tonsan® 1527 Black is a high-quality, one-component sealant based on silicone polymer. It cures by a chemical reaction with moisture to an elastic product. This material is recommended for sealing the side frames of solar cells and for sealing the solar energy lamps. cell, sealing or adhering the junction boxes of solar,

Product Type1K (1 component) Sealant, Encapsulant

Application AreaBlades, Edge Gluing, Energy Storage, Frame Sealing, HVAC Applications, Ingot Bonding, Junction Boxes, Lithium-Ion Battery, Module Installation, PV Module Frame Sealing, Rail Bonding, Solar Cell, Turbines

Compatible Substrates & SurfacesAluminum, Glass, Metal

Chemical FamilySilicones

FeaturesExcellent Damp-Freezing Performance , Excellent Damp-Heat Performance , Excellent Dielectric Properties, Excellent Thermal Cycling Performance, Exceptional UV Resistance, Flame Retardant, Good Sagging Resistance, Good Thermal Stability, Good Weather Fastness, UL Listed, UV Resistant

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Applications & Uses

Compatible Substrates & Surfaces
Cure Method
Application Instructions
  • For best result, clean and dry all surface to be sealed.
  • Apply a continuous and even bead of silicone to one surface.
  • Assemble parts. Remove excess with knife.
Curing Profile

Recommended cure: Curing depth is 2mm at 21 - 25°C, 45 - 55% RH for 24h


Physical Form
Black paste
Cured Mechanical Properties
ValueUnitsTest Method / Conditions
Hardness**48.0ISO7619, GB/T531, Shore A
Elongation at Break**300.0%ISO37, GB/T528
Tensile Strength**2.3MPaISO37, GB/T528
Adhesion Strength**1.8MPaISO4587, GB/T7124
Electrical Properties
ValueUnitsTest Method / Conditions
Volume Resistivity1.0 x 10¹⁵Ω.cmIEC60093, GB/T1692
Breakdown Tension20.0kV/mmIEC 60243-1, GB/T16- -95
Technical Data
ValueUnitsTest Method / Conditions
ViscosityWhite paste
Extrusion Rate10 - 20s/20g
Working Time5 - 15min
Cured Properties
ValueUnitsTest Method / Conditions
Flash Point*min. 93°CISO3679,GB/T 5208-2008
Cure Speed (Fixture/full, Cured at 21 - 25°C, 45 - 55% RH)6.0min/24h
Operating Temperature Range*- 54 - 210°C
Damp Heat Aging Test Properties
ValueUnitsTest Method / Conditions
Elongation at Break (at 85°C, 85% RH, for 1000h)320.0%ISO37, GB/T528
Tensile Strength (at 85°C, 85%RH, 1000h)1.6MPaISO37, GB/T528

* - Cure speed will vary with temperature, relative humidity, depth of material and presence of moisture.

** - Measured on cured sheets approx. 2mm. Cured at 21 - 25°C, 45 - 55% RH for 14 days, tested at 21 - 25°C.

Packaging & Availability

Country Availability
Regional Availability
  • Africa
  • China
  • Europe (Excluding Russia)
  • India
  • Middle East
  • North America
  • South East Asia
Packaging Information
  • 310ml
  • 400ml
  • 600ml
  • 235kg

Storage & Handling

Shelf Life
12 Months
Storage Condition

Product shall be ideally stored in a cool, dry area in unopened containers at room temperature.

Disposal Advice
  • Allow adequate ventilation when using.
  • Avoid prolonged skin contact.
  • In case of eye contact, flush with water and seek medical attention.
  • This product is not recommended for use in pure oxygen and/or oxygen rich systems and should not be selected as a sealant for chlorine or other strong oxidizing materials.