Hernon Tuffbond 394 Technical Data Sheet

Product Description

Hernon Tuffbond 394 is a single component, high temperature resistant, heat activated epoxy. It cures to a high performance thermoset system with excellent adhesion properties to a wide variety of substrates. The rapid curing mechanism of 1.5 minutes at a bondline temperature of 150ºC makes it ideal for production line use. Tuffbond 394 will change from amber-yellow to a reddish brown upon cure.

 

Bonding the voice coil to the cone has been a challenge for engineers, specifically when the adhesive temperature resistance requirement is above 200ºF (93ºC). Two component epoxy has been most commonly used for this application, but limitations such as mixing ratio, cure speed, potential solidification in equipment and static mixers and the need for equipment flushing solvents have made Tuffbond 394 more practical.

 

Product Benefits

• • High temperature resistance.
• • Single component (no mixing, no pot life).
• • Solventless.
• • Cures on demand (heat cure).
• • Will not slip during cure.
• • Fast setting: 1.5 minutes at 150oC bondline.
• • Changes color upon cure (yellow to brown).
• • Excellent adhesion to various substrates.
• • Gives high shear.
• • Low water absorption.
• • Very rigid.
• • Low density.
• • No porosity upon cure.

 

Typical Properties (Uncured)

Property Value

Resin Epoxy

Appearance Amber-yellow liquid

Viscosity @ 25ºC, cP 44,000 to 56,000

Specific gravity 1.19

Flash point See MSDS

 

Curing Characteristics

Tuffbond 394 can be cured by infra-red or convection oven. Cure time will depend on the bondline temperature.

Temperature, ºC (ºF) Cure Time, minutes

150 (300) 0.5

120 (250) 1

100 (212) 6

Typical Properties (Cured)

Property Value

Heat Resistance, ºC (ºF) 204 (400)

Elongation, % 6.1

Typical Cured Performance

Shear Strength, ISO 4587 Cured 5 minutes at 150ºC

Substrate Shear Strength, N/mm² (psi)

Steel 13.8 (2000)

Aluminum 12.4 (1800)

Typical Environmental Resistance

Chemical/Solvent Resistance

Shear Strength, gritblasted steel, ISO 4587 Cured 2 minutes at 150ºC

30 days immersion in chemical/solvent

Chemical/Solvent % Initial Strength Retained

Water 100

Sulfuric Acid 99

Ammonia, 25% 99

Methanol 97

Xylene 98

 

General Information

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.

For safe handling information on this product, consult the Material Safety Data Sheet (MSDS).

 

Storage

Tuffbond 394 must be stored under refrigeration at a temperature of 35 to 40ºF for extended shelf life. To prevent contamination of unused material, do not return any material to its original container.

 

Dispensing Equipment

Hernon offers a complete line of semi and fully automated dispensing equipment. Contact Hernon Sales for additional information.

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  Hernon Tuffbond 394 Technical Data Sheet (85.6 KB, 106 次)