H.B. Fuller 7648

H.B. Fuller 7648 is a single-component, anaerobic retaining and locking adhesive that develops extremely high strength. It is used to bond cylindrical parts and can be applied to retain pulleys, gears, rotors, and shafts, as well as secure bushings, bearings, and housing plugs. Additionally, H.B. Fuller 7648 augments shrink and press-fit assemblies in high-heat and high-friction environments.

Product Type1K (1 component) Adhesive, Anaerobic Adhesive, Retaining Compound

Application AreaAppliances, Bearings, Bushings, Cylindrical Fitting Parts, Gears, Pulleys, Rotors, Shafts

Compatible Substrates & SurfacesMetal

Chemical FamilyUrethane Methacrylates

FeaturesHigh Strength

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Ready-to-Use Product Features

Applications & Uses

Compatible Substrates & Surfaces
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. 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. An adequate bond develops in 15 to 45 minutes and maximum strength is attained in 24 hours. This product is not recommended for use in pure oxygen environments and/or oxygen-rich systems and should not be slected as a sealant for chlorine or other strong oxidizing materials. This product is not designed for plastics, particularly thermoplastics where stress cracking of the plastic could result. It is recommended to confirm compatibility of the product with all substrates prior to use.

Properties

Color
Physical Form
Cured Mechanical Properties
ValueUnitsTest Method / Conditions
Locking Strengthhigh
Service Temperature- 55 - 205°C
Breakaway Torque50 - 150in-lb
Prevailing Torquemin. 200
Pin/Collar Shear Strength2000.0psi
Technical Data
ValueUnitsTest Method / Conditions
Specific Gravity1.1
Cured Properties
ValueUnitsTest Method / Conditions
Full Cure Conditions24.0h
Cure AppearanceGreen solid
Uncured Properties
ValueUnitsTest Method / Conditions
Flash Pointmin. 93°C
Gap Fill0.01inch
Rheological Properties
ValueUnitsTest Method / Conditions
Viscosity (at 0.50 rpm)400 - 800cPBrookfield
Specifications

Mil-R-46082B, Type II; ASTM-D5363 AN 0412

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.

Set Time on Various Substrates

H.B. Fuller 7648 - Set Time On Various Substrates

Heat Aging (aged at temperature indicated and tested at 22°C)

H.B. Fuller 7648 - Heat Aging (Aged At Temperature Indicated And Tested At 22°C)

Hot Strength (%RT strength, tested at temperature)

H.B. Fuller 7648 - Hot Strength (%Rt Strength, Tested At Temperature)

Solvent Resistance
Solvent Example Resistance
Alcohol

Ethanol, Methanol

+ + +
Ester (aromatic) Ethylacetate – – –
Ketone (aromatic)

Acetone, Benzophenone

– – –
Aliphatic hydrocarbon (alkanes)

Petrol, Heptanes, Hexane

+ + –
Aromatic hydrocarbons

Benzyl, Toluol, Xylol

+ + –
Halogenated hydrocarbons

Methylenchloride, Chloroform, Chlorobenzol

– – –
Weak aqueous

Nitrite, muriatic acid, sulphuric acid, phosphoric acid

+ + + (– – – if concentrated)
Weak aqueous base

sodium hydroxide solution, caustic potash

+ + + (– – – if concentrated)

Packaging & Availability

Regional Availability
  • Latin America
  • North America

Storage & Handling

Shelf Life
12 Months
Storage Conditions
  • Storage Temperature: 20°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.