H.B. Fuller 7242

H.B. Fuller 7242 is a single-component anaerobic threadlocking adhesive. It is thixotropic and develops medium strength. H.B. Fuller 7242 is designed to prevent the loosening of threaded fasteners. It is suitable for applications where disassembly with hand tools is required for servicing.

Product Type1K (1 component) Adhesive, Anaerobic Adhesive

Application AreaThread

Chemical FamilyDimethacrylate Ester

FeaturesSolvent Resistance, Thixotropic

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Ready-to-Use Product Features

Applications & Uses

Markets
Application Area
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 StrengthMedium
Service Temperature- 55 - 150°C
Breakaway Torque70 - 150in-lb
Prevailing Torque30 - 100in-lb
Technical Data
ValueUnitsTest Method / Conditions
Specific Gravity1.0
Cured Properties
ValueUnitsTest Method / Conditions
Full Cure Conditions24.0h
Cure AppearanceBlue solid
Uncured Properties
ValueUnitsTest Method / Conditions
Flash Pointmin. 93°C
Gap Fill0.007inch
Rheological Properties
ValueUnitsTest Method / Conditions
Viscosity (at 0.50 rpm, spindle 7)800 - 1,600cPBrookfield

Regulatory & Compliance

Specifications

Mil-S-46163A, Type II Grade N; ASTM D-5363 AN 0321

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 7242 - Set Time On Various Substrates

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

H.B. Fuller 7242 - Heat Aging (Aged At Temperature Indicated And Tested At 22°C)

Hot Strength (%RT strength, tested at temperature)

H.B. Fuller 7242 - 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)

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.