H.B. Fuller Blue Gel

H.B. Fuller Blue Gel is a single-component, anaerobic, threadlocking adhesive gel that develops medium strength. H.B. Fuller Blue Gel prevents the loosening of threaded fasteners. It is suitable for applications where disassembly with hand tools is required for servicing. Its innovative pump design improves dispensing ease and accuracy while also limiting cleanup.

Product Type: 1K (1 component) Adhesive, 1K (1 component) Sealant, Anaerobic Adhesive, Anaerobic Sealant, Thread Locker

Application Area: Fasteners, Threading Operations

Features: Medium Strength, Thixotropic

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Features & Benefits

Ready-to-Use Product Features

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. 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.


Physical Form
Cured Mechanical Properties
ValueUnitsTest Method / Conditions
Locking StrengthMedium--
Service Temperature- 55 - 150°C-
Breakaway Torque120 - 170in-lb-
Prevailing Torque40 - 100in-lb-
Technical Data
ValueUnitsTest Method / Conditions
Viscosity (at 0.50 rpm)100,000 - 200,000cPBrookfield
Specific Gravity1.1--
Cured Properties
ValueUnitsTest Method / Conditions
Full Cure Conditions24.0h-
Cure AppearanceBlue solid--
Uncured Properties
ValueUnitsTest Method / Conditions
Flash Pointmin. 93°C-
Gap Fill0.5inch-

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 Blue Gel - Set Time On Various Substrates

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

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

Hot Strength (%RT strength, tested at temperature)

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

Solvent Resistance
Solvent Example Resistance

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.