H.B. Fuller 77TL

H.B. Fuller 77TL is a high-strength anaerobic adhesive that is used for locking and sealing thread connections and fitted parts. It has a high viscosity that allows for larger tolerances assembling. This product is highly resistant to heat, corrosion, vibrations, water, gasses, oils, hydrocarbons, and many chemicals.

Product Type1K (1 component) Adhesive, Anaerobic Adhesive, Thread Locker

Application AreaAppliances, Threading Operations

Chemical FamilyDimethacrylate Ester

FeaturesChemical Resistant, Corrosion Resistant, Heat Resistance, High Strength, High Viscosity, Hydrocarbon Resistant, Oil Resistant, Vibration Resistance, Water Resistant

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Features and Benefits
  • Fluorescent UV Indicator
  • Highly Resistant to Heat, Corrosion, Vibrations, Water, Gases, Oils, Hydrocarbons, and Many Chemicals
  • High Strength
  • Medium Viscosity

Applications & Uses

General Instructions

Surfaces to be bonded should be clean and dry and free of grease. Product should be applied in enough quantity to fill all engaged threads or gap. The product performs best in thin bond gaps. Very large gaps may create gaps that will affect the cure speed and overall strength. Good contact is essential. It is recommended to confirm compatibility of the product with all substrates prior to use. This product is not recommended for use with strong oxidizing materials. Where aqueous washing systems are used to clean the surfaces before bonding, these aqueous washes can affect the cure and performance of the adhesive. This product is not normally recommended for use on plastics, users must check compatibility of the product with such substrates.


Physical Form
Chemical Resistance
ValueUnitsTest Method / Conditions
Room Temperature Strength (50% Water/50% Glycol, at 87°C, 1000h)90.0%
Room Temperature Strength (Unleaded gasoline, at 22°C, 1000 h)100.0%
Room Temperature Strength (Motor oil, at 125°C, 1000 h)100.0%
Room Temperature Strength (Brake fluid, at 125°C, 1000h)100.0%
Room Temperature Strength (Acetone, at 125°C, 1000 h)95.0%
Cured Properties
ValueUnitsTest Method / Conditions
Service Temperature- 55 - 150°C
Specific Heat0.3kJ/kgK
Coefficient of Thermal Expansion80.0ppm/KASTM D696
Thermal Conductivity0.1W/m.KASTM C177
Breakaway Torque23 - 40N-mISO 10964
Breakloose Torque28 - 48N-mDIN 54454
Cure Speed (at 5°C, 25% of room temperature strength)4.0h
Cure Speed (at 5°C, 50% of room temperature strength)6.0h
Cure Speed (at 5°C, 100% of room temperature strength)24 - 72h
Cure Speed (at 40°C, 25% of room temperature strength)12.0min
Cure Speed (at 40°C, 50% of room temperature strength)20.0min
Cure Speed (at 40°C, 100% of room temperature strength)2.0h
Cure Speed on Steel (25% of room temperature strength)1.0min
Cure Speed on Steel (50% of room temperature strength)2.0h
Cure Speed on Steel (100% of room temperature strength)15 - 72h
Cure Speed on Brass (25% of room temperature strength)3.0h
Cure Speed on Brass (50% of room temperature strength)5.0h
Cure Speed on Brass (100% of room temperature strength)20 - 72h
Cure Speed on Zinc Dichromate (25% of room temperature strength)1.0h
Cure Speed on Zinc Dichromate (50% of room temperature strength)2.0h
Cure Speed on Zinc Dichromate (100% of room temperature strength)15 - 72h
Damp Heat Aging Test Properties
ValueUnitsTest Method / Conditions
Heat Aging Testing (at 120°C, 3000 h)60.0%
Heat Aging Testing (at 150°C, 3000 h)15.0%
Uncured Properties
ValueUnitsTest Method / Conditions
Set Time (Steel)15.0
Flash Pointmin. 93°C
Viscosity6000 - 8000cP
Specific Gravity1.12
Full Cure Conditions15 - 72h

ASTM D-5363 AN 0211

Technical Details & Test Data

Curing Performance

The rate of cure will depend on environmental conditions and the substrates used. The gap of the bond line will affect set speed. Smaller gaps tend to increase set speed. Activators may be applied to further improve set speed, but may also impair overall adhesive performance.

Hot Strength (%RT strength, tested at temperature)

H.B. Fuller 77TL - Hot Strength (%Rt Strength, Tested At Temperature)

Packaging & Availability

Regional Availability
  • Latin America
  • North America

Storage & Handling

Shelf Life
12 Months
Storage Conditions
  • Storage Temperature: 8 to 28°C.
  • Products should be stored unopened in a cool, dry place out of direct sunlight. Products may be refrigerated for improved shelf life, but should be brought back to room temperature before use.