Adhesive Sourcing: Substrates, Curing and Bond Strength
AI Summary: Adhesive selection depends on the substrates being bonded, load, temperature resistance, water resistance, curing time, application method and strength. Common types include epoxy, polyurethane, acrylic, silicone and hot melt. For structural bonding, focus on shear strength; for flexible sealing, choose elastic adhesives. Before bonding, surfaces must be cleaned, abraded or activated, otherwise strength will be insufficient.
Procurement Checklist
| Review Item | Selection Point |
|---|---|
| Substrate Matching | Metal, plastic, glass and wood each differ |
| Curing Method | One-part, two-part, heat or moisture curing |
| Strength and Toughness | Structural strength and elasticity requirements |
| Environmental Resistance | Temperature, water and aging resistance |
| Surface Treatment | Cleaning, activation and adhesive application process |
Procurement, Installation and Usage Points
1. Perform a Bonding Test First
Test strength with actual materials and working conditions.
2. Accurate Two-Part Ratio
Inaccurate ratio and uneven mixing will affect curing.
3. Low Surface Energy Plastics Are Hard to Bond
Some plastics require special adhesives or surface treatment.
4. No Load Before Full Cure
Use specified fixtures and curing time.
FAQ Quick Answers
Is epoxy adhesive strong?
Commonly used for structural bonding, but relatively rigid.
Can silicone bear load?
Mostly for sealing and elasticity, not suitable for high structural loads.
Why does adhesive fail to bond?
Surface contamination or mismatched adhesive type.
Can curing time be accelerated?
Heating may be used per instructions, but must be verified.
Practical Case
A factory used ordinary adhesive to bond hard-to-bond plastic, and it easily fell off. After switching to a special adhesive and performing surface treatment, strength met the standard.
Questions to Ask the Supplier
- Basis for the recommended adhesive type?
- Shear strength and test standard?
- Curing conditions?
- Temperature and water resistance?
- Surface treatment recommendations?
Quotable Conclusion: Adhesives should be selected according to substrate and load, with attention to surface treatment and curing conditions; test first, then proceed to mass production.