Tonsan® 1321FS is a high-performance epoxy structural adhesive. It is a one-part, heat-resistant epoxy adhesive known for its exceptional properties, including super-high shear strength, high thixotropy, high T-peel strength, and low shrinkage. This adhesive is suitable for demanding applications that require strong bonds and can be used to bond a variety of materials, including magnetic steel, metal, stone, wood, ceramics, and more.

Product Type: 1K (1 component) Adhesive, Epoxy Adhesive, Structural Adhesive

Compatible Substrates & Surfaces: Ceramic, Metal, Steel, Stone, Wood

Chemical Family: Epoxy & Epoxy Derivatives

Features: Excellent Performance, Excellent T-Peel Strength, Good Bonding Strength, Thixotropic

Technical Data Sheet

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Enhanced TDS

Identification & Functionality

Features & Benefits

Ready-to-Use Product Features
Product Highlights
  • Single component, easy to operate
  • High thixotropy
  • Heat resistance
  • High bonding strength
  • High T-peel strength

Applications & Uses

Compatible Substrates & Surfaces
Cure Method
Application Information
  • Proper surface preparation is essential to the success of any epoxy application.
  • In all cases the surface should be clean, dry, free from oils, and rough.
  • Clean and abrade application surface. Sandblast or grind for better adhesion.
  • All abrasive preparation should be followed by another cleaning to remove any remnants from the surface.
  • Cover mixed material over the prepared surface firmly to ensure maximum surface contact.
  • Thickness: Ensure the surface of the object have no lack of adhesive layer, the best thickness is 0.05~0.20 mm, heat at 120℃ or 150℃ for appropriate time for curing.

Properties

Color (Properties)
Physical Form
Cured Mechanical Properties
ValueUnitsTest Method / Conditions
Lap Shear Strength (Carbon Steel, Sandblasted, 30 mins, at 150°C)37.2MPaGB/T 7124 (IDT ISO 4587)
Lap Shear Strength (Carbon Steel, 30 mins, at 150°C)30.1MPaGB/T 7124 (IDT ISO 4587)
Lap Shear Strength (Al, 3 mm, Anodic Treatment, 30 mins, at 150°C)17.4MPaGB/T 7124 (IDT ISO 4587)
Lap Shear Strength (Nickel Plated Steel, 30 mins, at 150°C)27.3MPaGB/T 7124 (IDT ISO 4587)
Lap Shear Strength (Stainless Steel, 30 mins, at 150°C)34.5MPaGB/T 7124 (IDT ISO 4587)
Lap Shear Strength (Galvanized Steel, 30 mins, at 150°C)27.6MPaGB/T 7124 (IDT ISO 4587)
Lap Shear Strength (FR4, 30 mins, at 150°C)19.1MPaGB/T 7124 (IDT ISO 4587)
Lap Shear Strength (CFRP, 30 mins, at 150°C)23.2MPaGB/T 7124 (IDT ISO 4587)
T-peel Strength (Al, 0.5 mm, Anodic Treatment)5.2N/mmGB/T 2791 (re. ISO 11339)
Impact strength34.5kJ/m²GB/T 6328 (IDT ISO 9653)
Breakdown Voltage34.2kV/mmGB/T 1695 (NEQ ASTM D149-97a)
Volume Resistivity4.16 * 10¹⁵Ω.cmGB/T 1410 (IEC 60093:1980, IDT)
Surface Resistivity3.82 * 10¹⁵Ω.cmGB/T 1410 (IEC 60093:1980, IDT)
Aging Test
ValueUnitsTest Method / Conditions
Lap Shear Strength (after Thermal Aging, Carbon Steel, Sandblasted, at 60°C, 1000h)36.1MPaGB/T 7124 (IDT ISO 4587)
Lap Shear Strength (after Thermal Aging, Carbon Steel, Sandblasted, at 100°C, 1000h)35.5MPaGB/T 7124 (IDT ISO 4587)
Lap Shear Strength (after Thermal Aging, Carbon Steel, Sandblasted, at 120°C, 1000h)35.2MPaGB/T 7124 (IDT ISO 4587)
Lap Shear Strength (after Thermal Aging, Carbon Steel, Sandblasted, at 150°C, 1000h)32.3MPaGB/T 7124 (IDT ISO 4587)
Lap Shear Strength (after Thermal Aging, Carbon Steel, Sandblasted, at 180°C, 1000h)24.4MPaGB/T 7124 (IDT ISO 4587)
Technical Data
ValueUnitsTest Method / Conditions
Viscosity (at 23°C)640,000 / 410,000mPa·smPa.sBrookfield Viscometer DV2T, 0.1/1 rpm
Thixotropic Index (at 23°C)1.56-Brookfield Viscometer DV2T, 0.1/1 rpm
Density1.17g/cm³-
Cure Schedule (at 150°C)30 mins--
Cure Schedule (at 120°C)50.0Minutes-
Solvent Resistance
Rheology Value

Condition/Method

10% H2SO4 (23℃) Good JB/T 10283
40% H2SO4 (23℃) Good JB/T 10283
10% H3PO4 (23℃) General JB/T 10283
10% HNO3 (23℃) Excellent JB/T 10283
10% CH3COOH (23℃) Poor JB/T 10283
10% NaOH (23℃) Excellent JB/T 10283
10% NaClO (23℃) Excellent JB/T 10283
10% Na2CO3 (23℃) Excellent JB/T 10283
10% NaCl (23℃) Excellent JB/T 10283
H2O (23℃) Excellent JB/T 10283
Acetone (23℃) General JB/T 10283
Kerosene (23℃) Excellent JB/T 10283
Methylbenzene (23℃) Excellent JB/T 10283
Methyl chloroform (23℃) Poor JB/T 10283

Packaging & Availability

Packaging Information
  • 310 mL
  • 1 kg
  • 4.5 kg
  • 5 gal

Storage & Handling

Shelf Life
6 months
Storage Conditions
  • Stored in unopened containers in a cool, dry area at a temperature at 2~8℃ with the shelf life of 6 months.
  • Lower temperature can extend the storage time; the ideal storage is below 0℃.