Product category: Instant adhesives
- Technical specifications
LOCTITE® 402 is a high temperature and fast-fixturing instant adhesive (industrial grade) that reliably and strongly bonds to a wide range of plastic, rubber, and metal substrates. It is ideally suited for the joining of small parts in high-speed production applications as well as quick, on-the-go repairs. Using the primer LOCTITE® SF 770, the assembly of difficult-to-bond (PP, PE, PTFE) materials is possible.
Ultra-performance adhesive providing high temperature resistance (up to 275°F) with fast fixture
Ideal for quick repairs as well as high speed production applications
Unique, patented formula with reduced hazardous ingredients
Assembles difficult-to-bond materials using LOCTITE® SF 770 primer
High Speed Production Bonding,Repairing
Fixture time, Steel (grit blasted):
Fast Setting,For Difficult-to-Bond Materials,Temperature Resistant
-40.0 °C - 135.0 °C
Recommended for use with:
Shear strength, Mild Steel (grit blasted):
> 15.0 N/mm²
110.0 mPa·s (cP)
How to use
It is recommended to use the correct LOCTITE® cleaner for the surface to be bonded (such as LOCTITE® SF 7070™) to degrease and clean surfaces prior to applying the adhesive.
To improve adhesion on difficult to bond plastic surfaces, apply LOCTITE® SF 770™ to the bond area by brushing or dipping. Avoid applying excess primer. Allow the primer to dry.
If cure speed is too slow, use appropriate activator LOCTITE® SF 7458™ or LOCTITE® SF 7452™ (see cure speed vs activator graph in TDS). Apply activator to one bond surface by spray, brush or dipping (not primed surfaces). Allow the activator to dry.
Apply adhesive onto one side/part.
Assemble parts immediately. The parts should be accurately located as the short fixture time leaves little opportunity for adjustment. Bond should be held or clamped until the adhesive has fixtured.
Hint: if necessary, excess product can be cured by activator LOCTITE® SF 7458™ or LOCTITE® SF 7452™. Spray or drop activator onto excess product.
For precise dispensing of small amounts of adhesive, the use of dispensing needles is recommended.
Although HQ is not part of the product formula for LOCTITE® 402, trace amounts are possible due to shared manufacturing processes and/or select raw material impurities. Hence, Henkel has taken the additional step of introducing a low specification level (< 50 PPM for HQ) and each batch is now checked for this after manufacture.
This is a result of stress cracking. Leaving uncured liquid CA remaining on some plastic substrates (such as polycarbonate, acrylic, and polysulfone) in a stressed condition, may cause the formation of cracks in the plastic. Some remedies for avoiding/minimizing stress cracking are closing the bond joint quickly, using reinforced grades of plastic, anneal parts, or speed cure the CA with accelerator or light (for light cure products only).
This is called blooming. This often occurs when there is an excessive amount of product being applied. To avoid blooming, use proper ventilation, less product, lower humidity, use a primer/accelerator, or a low bloom product.
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