Tonsan® 1581 White is one component material that is unaffected by moisture in the air. This material is recommended for sealing the side frames of solar cells and sealing the solar energy lamps. alkoxy-cure silicone adhesive cures at room temperature when exposed cells are sealed or adhered to the junction boxes of solar cells.

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

Application Area: Blades, Edge Gluing, Energy Storage, Frame Sealing, Ingot Bonding, Junction Boxes, Lithium-Ion Battery, Module Installation, PV Module Frame Sealing, Rail Bonding, Solar Cell, Solar Energy Lamps, Turbines

Compatible Substrates & Surfaces: Aluminum Alloys, Glass

Chemical Family: Silicones

Features: Excellent Damp-Freezing Performance , Excellent Damp-Heat Performance , Excellent Dielectric Properties, Excellent Thermal Cycling Performance, Flame Retardant, Good Weather Fastness, Low Odor, UL Listed, UV Resistant

Technical Data Sheet
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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
White paste
Cured Mechanical Properties
ValueUnitsTest Method / Conditions
Hardness*45.0-ISO7619, GB/T531, Shore A
Elongation at Break*260.0%ISO37, GB/T528
Tensile Strength*2.5MPaISO37, GB/T528
Adhesion Strength*2.0MPaISO4587, 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--
Flash Pointmin. 93°CISO3679,GB/T 5208 ,5208-2008
Cure Speed (Fixture/full, Cured at 21 - 25°C, 45 - 55% RH, 2mm)3.0min/24h-
Operating Temperature Range- 54 - 210°C-
Extrusion Rate10 - 20s/20g-
Working Time3 - 15min-
Curing Speedmin. 0.8mm/3h-
Damp Heat Aging Test Properties
ValueUnitsTest Method / Conditions
Elongation at Break (at 85°C, 85% RH, for 1000h)260.0%ISO37, GB/T528
Tensile Strength (at 85°C, 85%RH, 1000h)1.8MPaISO37, GB/T528
Adhesion Strength (at 85°C, 85% RH, 1000h, Al)1.5MPaISO4587, GB/T7124

*- Measured on cured sheets ~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
  • India
  • Middle East
  • North America
  • South East Asia

Storage & Handling

Storage Condition

Product shall be ideally store in a cool, dry area in unopened containers at a temperature between 8 to 28°C unless otherwise labeled. Optimal storage is at the lower half of this temperature.

Safety and Disposal
  • 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 oxygen and/or oxygen rich systems and should not be selected as a sealant for chlorine or other strong oxidizing materials.