What Are Anaerobic Adhesives?
2026-06-03
Anaerobic adhesives, commonly referred to as anaerobic glues, do not cure when exposed to oxygen or air. However, once isolated from the air, they rapidly polymerize and cure at room temperature—either on metal surfaces or in the presence of a catalyst—forming a strong bond and effective seal with the substrate.
Characteristics of Anaerobic Adhesives
① Anaerobic;
② Most anaerobic adhesives are single-component, and their viscosity, strength, and initial cure time can be adjusted as needed;
③ Excellent performance, with good weather resistance and resistance to various media;
④ Minimal shrinkage during curing; nearly 100% of the components participate in the curing reaction, resulting in excellent sealing performance;
⑤ Stable storage life, generally lasting more than one year;
⑥ Versatile applications, suitable for locking, sealing, bonding, retaining, and filling.
Types of Anaerobic Adhesives
Based on their intended applications, anaerobic adhesives can be classified into thread-locking adhesives, pipe thread sealants, face sealants, cylindrical part retention adhesives, structural adhesives, and impregnation adhesives. Each type of anaerobic adhesive is formulated into different grades based on initial cure speed, viscosity, and cured mechanical properties and is distinguished by the use of different pigments.
Typical Formulations for Thread-Locking Anaerobic Adhesives
Typical Formulations for One-Component Thread-Locking Anaerobic Adhesives
Ingredient | Parts by Mass | Function Description |
Tetraethylene glycol dimethacrylate | 62 | Monomer, diester |
Fumaric acid polyester | 30 | Modified resin, oligomer |
Cumene hydroperoxide | 3 | Initiator |
Aromatic amine accelerator | 1 | Accelerator to speed up curing reaction |
2 | Accelerator to speed up curing reaction | |
2 | Thixotropic agent, improves anti-sagging property of adhesive | |
Benzoquinone | 0.01 | Stabilizer, enhances storage stability of adhesive |
Dyestuff | 0.1 | Colorant for tinting |
Curing Performance | M10 bolt, fixture time: ~10–20 min at 25°C, breakaway torque: ~25–30 N·m | / |
Typical Formulations for Microencapsulated Thread-Locking Anaerobic Adhesives
Component A consists primarily of diacrylates, acrylic emulsion, accelerators, and polymerization inhibitors, while Component B consists of microcapsules containing dibenzoyl peroxide initiators coated with urea-formaldehyde resin.
Component | Ingredient | Parts by Mass | Function Description |
Component A | Water | 50 | Dispersant, adjusts film thickness after coating |
| Sodium polyethylene-maleate solution | 10 | Adhesive with emulsification & dispersion |
| 35 | performance | |
| Oil-soluble red dye | 0.2 | Reactive monomer |
| Ground calcium carbonate | 5 | Colorant |
| Ferrocene | 0.1 | Filler for reinforcement |
Component B | Microcapsules with benzoyl peroxide core & urea-formaldehyde resin shell | 3.5 | Catalyst |
Curing Property | M10 bolt, fixture time ≈ 1 min at 25°C, breakaway torque = 15 N·m | / | Initiator |
Typical Formulations for Pipe Thread Sealing Anaerobic Adhesives
Ingredient | Parts by Mass | Function Description |
20 | Monomer, diester | |
Polyethylene glycol laurate | 22 | Resin, reduces bonding strength |
Fumaric polyester | 32 | Modified oligomeric resin, increases adhesive viscosity |
Cumene hydroperoxide | 2 | Initiator |
3 | Pigment for coloration | |
15 | Filler, improves sealing property and chemical resistance | |
Saccharin | 2 | Accelerator to raise curing speed |
Aromatic amine accelerator | 1 | Accelerator to accelerate curing reaction |
Fumed silica | 3 | Thixotropic agent, prevents adhesive sagging |
Benzoquinone | 0.01 | Stabilizer, improves adhesive storage stability |
Curing Performance | M10 bolt, fixture time: 10～20 min at 25°C, breakaway torque: 1～5 N·m | / |
Typical Formulations for Retention-Type Anaerobic Adhesives
Analysis of Typical Formulations for Cylindrical Component Retention-Type Anaerobic Adhesives
Ingredient | Parts by Mass | Function Description |
Ethoxylated Bisphenol A Dimethacrylate | 40 | Monomer, diester |
32 | Monomer for improved bonding strength | |
Fumaric Polyester | 20 | Modified oligomeric resin |
Cumene Hydroperoxide | .3 | Initiator |
Maleic Acid | 1 | Reinforcer to enhance bonding strength |
Acetylphenylhydrazine | 0.5 | Accelerator to speed up curing reaction |
Saccharin | 0.5 | Accelerator to increase curing rate |
Aromatic Amine Accelerator | 1 | Accelerator to accelerate curing reaction |
Fumed Silica | 2 | Thixotropic agent, prevents adhesive sagging |
Benzoquinone | 0.01 | Stabilizer, improves storage stability of adhesive |
Dyestuff | 0.1 | Colorant for tinting |
Curing Performance | Fixture time: ~10–20 min at 25°C, compressive shear strength: ~20–25 MPa | / |
Typical Formulations for Structural Bonding Anaerobic Adhesives
Ingredient | Parts by Mass | Function Description |
15 | Diluent monomer, improves temperature resistance | |
Carbonate ether dihydroxydimethyl dimethacrylate | 70 | Diluent monomer, improves temperature resistance |
Saccharin | 1 | Accelerator to increase curing speed |
Acetylphenylhydrazine | 0.3 | Accelerator to speed up curing reaction |
Benzoquinone | 0.02 | Stabilizer, improves adhesive storage stability |
0.05 | Metal ion chelating agent, enhances storage stability of adhesive | |
Cumene Hydroperoxide | 1 | Initiator |
Curing Performance | Fixture time: 2～10 min at 25°C, tensile shear strength: 15 MPa (carbon steel substrate) | / |
Typical Formulations for Flat-Surface Sealing Anaerobic Adhesives
Ingredient | Parts by Mass | Function Description |
15 | Monomer, diester | |
Aminomethyl dimethacrylate | 75 | Polyurethane methacrylate diester, provides toughness and sealing performance |
Cumene hydroperoxide | 3.4 | Initiator |
Acetylphenylhydrazine | 0.5 | Accelerator to accelerate curing reaction |
Saccharin | 4 | Accelerator to increase curing rate |
Fumed silica | 5 | Thixotropic agent, prevents adhesive sagging |
Benzoquinone | 0.01 | Stabilizer, improves adhesive storage stability |
Dyestuff | 0.1 | Colorant for tinting |
Curing Performance | Fixture time: 10–20 min at 25°C; breakaway torque of M10 bolt: 5–10 N·m | / |
Typical Formulations for Impregnation-Type Anaerobic Adhesives
Ingredient | Parts by Mass | Function Description |
75 | Monomer, diester | |
Lauryl methacrylate | 15 | Monomer |
Hydroxypropyl methacrylate | 5 | Monomer |
Surfactant | 5 | Improves the penetration of adhesive |
Hydroquinone | 0.05 | Stabilizer, enhances adhesive storage stability |
Azobisisobutyronitrile (AIBN) | 0.5 | Initiator |
Diphosphate accelerator | 0.1 | Accelerator to speed up curing reaction |
Dyestuff | 0.01 | Colorant for tinting |
Curing Performance | Parts are pressure-impregnated in impregnation equipment and cured in hot water at 90°C. Max sealable pore diameter: 0.1～0.3 mm, maximum withstand pressure above 20 MPa | / |
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