Tonsan® 1533 Black is a two-component adhesive that can cure quickly at room temperature, providing excellent sealing and bonding. This material is recommended for potting electronic components, typically for the junction box on PV modules. It has excellent dielectric properties and V1 flame retardancy.

Product Type: 2K (2 component) Sealant, Encapsulant, Potting Compound, Reactive Sealant

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

Chemical Family: Silicones

Features: Enhanced Damp Proofing, Excellent Performance, Excellent Sealing Capability, Excellent Substrate Adhesion, Fast Cure, Flame Retardant, Good Thick Section Cure, Room Temperature Curing

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Features & Benefits

Applications & Uses

Application Area
Application Instructions
  • Part A should be blended thoroughly before mix with Part B in order to make filling material distribute evenly.
  • Mix evenly according to the ratio.
  • Pot the mixed material.
  • Recommended using automatic dispensing equipment to applying the potting compound.

Recommended cure: 21 - 25°C, 45 - 55% RH for 7 days


Physical Form
Thermal Properties
ValueUnitsTest Method / Conditions
Thermal Service Range- 50 - 200°C-
Thermal Conductivity0.3W/m.KDIN EN 821
Electrical Properties
ValueUnitsTest Method / Conditions
Volume Resistivity1.0 x 10¹⁵Ω.cmGB/T 1692
Breakdown Strength20.0kV/mmGB/T 1695
Technical Data
ValueUnitsTest Method / Conditions
Mixed Density1.26g/cm³GB/T 13354
Volumetric Mix Ratio4:1--
Weight Mix Ratio5.5:1--
Cured Properties
ValueUnitsTest Method / Conditions
Flash Pointmin. 93°CGB/T 5208
Working Time (Viscosity higher than 30000 mPa·s)8.0min-
Gel Time60.0min-
Hardness45.0-GB/T 531, Shore A
Tensile Strength1.0MPaGB/T 528
Elongation at Break100.0%GB/T 528
Damp Heat Aging Test Properties
ValueUnitsTest Method / Conditions
Volume Resistivity (at 85°C, 85% RH, 1000h)1.0 x 10¹⁵Ω.cmGB/T 1692
Rheological Properties
ValueUnitsTest Method / Conditions
Viscosity (Resin)4000.0mPa.sGB/T 2794
Viscosity Activator50.0mPa.sGB/T 2794
Viscosity (Mixed)2000.0mPa.sGB/T 2794

Packaging & Availability

Country Availability
Regional Availability
  • Africa
  • China
  • Europe (Excluding Russia)
  • India
  • Middle East
  • North America
  • South East Asia

Storage & Handling

Shelf Life
6 Months
Storage Condition

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