Cyanoacrylate (superglue): types, substrates, limitations
Cyanoacrylate – the superglue – bonds in seconds and on a surprisingly wide range of materials. Those who know the types, substrates, and limitations of cyanoacrylate can achieve maximum results and avoid typical problems such as efflorescence or brittle joints.
To the point: What is cyanoacrylate suitable for?
Cyanoacrylate cures in seconds upon contact with atmospheric moisture and is suitable for small bonding surfaces on plastics, elastomers, and metals. It is ideal for fast, precise bonding. Limitations: large gaps, high continuous temperatures, persistent humidity, and peeling stress. For PE/PP, there are grades with a polyolefin primer. Key properties can be found in the technical data sheet.
Types according to task
| Variety | Strength | Typical for |
|---|---|---|
| Low viscosity | capillary penetration | precisely fitting, tight joining surfaces |
| Medium/high viscosity | Gap bridging | rough/uneven surfaces |
| gel | It's not running, it's not working | vertical surfaces, porous parts |
| Rubber/tough-modified | impact/peel tough | Elastomers, dynamic load |
| With primer (polyolefin) | Liability on LSE | PE, PP |
Guideline values – the specific suitability depends on the product and application and must be checked in the respective technical data sheet.
Suitable substrates
- Many plastics (ABS, PVC, PC), elastomers and metals,
- PE/PP only with polyolefin primer,
- porous materials (wood, leather) with a suitable grade.
Know your limits
- Gap: low-viscosity fluids require precisely fitting surfaces.
- Temperature/Humidity: Standard types are permanently limited.
- Peeling: Cyanoacrylate is shear-resistant but peel-sensitive.
- Blooming: Vapors can form white deposits – use sparingly, ventilate well, and if necessary, use special low-bloom types.
Practical tips
- Apply sparingly – one drop is often enough.
- Fit the surfaces together cleanly and precisely, then briefly fix them in place.
- The activator accelerates the curing process in difficult areas.
- Apply final strength only after complete hardening.
Activator and accelerator
On inactive or porous surfaces, or in the case of larger gaps, an activator accelerates the curing process. It is applied thinly to one side of the joint; too much activator can reduce the final strength – use sparingly.
Storage and shelf life
Cyanoacrylates are sensitive to moisture. Storing them in a cool, dry place in a tightly sealed container (follow the manufacturer's instructions) extends their shelf life. Opened containers deteriorate more quickly.
Frequently Asked Questions
Why does superglue turn white (blooming)?
Evaporating monomers leave a white residue. Use sparingly, ensure good ventilation, or use low-bloom types.
Does cyanoacrylate adhere to PE and PP?
Only with polyolefin primer. Without primer, it barely adheres to these plastics.
How fission-tolerant is cyanoacrylate?
Thin fluid types require precisely fitting surfaces; for gaps there are higher viscosity or gel variants, possibly with activator.
Sources and technical basis
The information is based on manufacturer data sheets (including Permabond, Henkel/Loctite) and recognized adhesive bonding principles. Suitability, temperature and media resistance are product-dependent and can be found in the respective technical data sheet.
How SILITECH supports
Tell us the materials, gap and load – we will recommend the appropriate cyanoacrylate grade including primer and activator and provide the data sheets.
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