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PERMABOND UV640
Permabond UV640 — UV/light-activated adhesive, Shore D 55-75.
UV adhesive for plastics, medium viscosity — UV630 variant with higher gap-filling capacity.
Documents
Internal reference:
49-640.FL
HS code:
3506.9190000
Permabond UV640 is the medium viscosity variant of the plastic UV adhesive UV630 — same curing chemistry and polycarbonate affinity, but better gap-filling ability for standard geometries.
With a viscosity of 3,000–5,000 mPa·s, UV640 is significantly more viscous than UV630 (250 mPa·s) and fills standard adhesive gaps without running. Its affinity for plastics remains the same: polycarbonate bonding leads to substrate failure.
Long-wave curing (365–420 nm) is the key to processing UV-stabilized plastics — where standard UV adhesives would not cure.
UV630 with higher viscosity and better gap -filling capacity — same plastic affinity, same curing chemistry 365–420 nm. Medium viscosity consistency for standard gaps in plastic bonding.
What makes Permabond UV640 stand out
What is Permabond UV640 used for?
processing
Recommended accessories
Important instructions
Which Permabond UV adhesive is suitable for which application?
Permabond UV640 in direct comparison with related products of the UV series.
Permabond UV640 Current product | Permabond UV630 → | Permabond UV645 → | Permabond UV649 → | |
|---|---|---|---|---|
| Application | UV adhesive for plastics (medium viscosity) | Low viscosity, biocompatible | Higher gap filling | Thixotropic for vertical application |
| viscosity | 3,000–5,000 mPa·s @ 20 rpm | 250 mPa·s | 8,000–10,000 mPa·s | 20,000–30,000 mPa·s |
| Substrate strength | >9 N/mm² (substrate failure) | Polycarbonat | Polycarbonat | PC/ABS |
| Elongation at break | 110 % | 110 % | >70 % | >70 % |
Technical data for PERMABOND UV640
| Product information | |
|---|---|
| Manufacturer | Permabond Engineering Adhesives Ltd |
| brand | Permabond |
| Container | 50 ml, 250 ml, 1 l, 2 l |
| Country of origin | Italy |
| Performance at final strength | |
|---|---|
| Tensile strength (ISO37) | 13 N/mm² |
| Refractive index | >1,490 |
| Elongation at break (elasticity) (ISO37) | 110% |
| Dielectric strength | 25-30 KV/mm |
| Dielectric constant 1MHz at 25°C | 4 |
| Water absorption (ISO62) 2 hours in boiling water | <5% |
| Shear strength polycarbonate | >9 N/mm² |
| Physical properties | |
|---|---|
| Color | colorless |
| Chemical group | Methacrylic acid esters |
| Viscosity (adhesives) | Medium viscosity 500 - 5000 mPas |
| Viscosity 20rpm | 3000-5000 |
| Specific gravity | 1.1 |
| Curing values | |
|---|---|
| Curing wavelength | 365 - 420 nm |
| Mechanical properties | |
|---|---|
| Hardness (Shore D) | 55-75 |
| Shear strength ISO 4587 in N/mm² | |
|---|---|
| Acrylic | >1.5 N/mm² |
| Thermal properties | |
|---|---|
| Operating temperature (°C) | -55 to +120 |
| Storage temperature (°C) | 5-25 |
For binding values, please refer to the technical data sheet (TDS) in the "Documents" tab.
Documents and datasheets
Click on a document for a preview or the download icon for a direct download.
Technical Data Sheets (TDS) 3
Frequently asked questions about Permabond UV640
Practical application and design questions — answered by SILITECH.
Permabond UV640 is a methacrylic acid ester (UV-curing, long-wavelength) adhesive with a viscosity of 3,000–5,000 mPa·s @ 20 rpm. This medium-viscosity UV adhesive for plastics offers higher gap-filling capacity than UV630. The adhesive cures upon irradiation with UV light in the spectral range of 365–420 nm—curing in seconds "on demand".
Permabond UV640 cures in the spectral range of 365–420 nm. Standard mercury vapor UV lamps, LED UV lamps with a suitable wavelength, or UV light guide systems are all suitable. For LED lamps, the maximum wavelength of the LED must be matched to the curing spectrum of the adhesive—we are happy to advise you on selecting the right lamp.
Permabond UV640 typically cures in: 5 s with a 4 mW/cm² low-power lamp; 2 s with a 100 mW/cm² LED lamp; 1 s with a 30 W/cm² UV light guide system. The exact curing time depends on the layer thickness and the light transmittance of the components.
Permabond UV640 bonds reliably to: Polycarbonate: >9 N/mm² (substrate failure); Acrylic: >1.5 N/mm². For thermoplastic substrates, we recommend testing compatibility before series production — release agents on injection-molded parts can impair adhesion.
Permabond UV640 is a UV adhesive for medium-viscosity plastics (3,000–5,000 mPa·s @ 20 rpm viscosity, 110% elongation at break). Permabond UV630 is a low-viscosity plastic adhesive (250 mPa·s, 110% elongation at break) — low viscosity, biocompatible.
When stored at 5 to 25 °C and protected from light, Permabond UV640 is stable until the printed expiration date. IMPORTANT: UV adhesives cure upon contact with light — always store the bottle in the dark and only open it briefly under UV-blocked light. Daylight-stable variants (e.g., UV675) can be used briefly under ambient light.
From the Permabond UV range, select according to substrate, viscosity, and special properties: Permabond UV640 (UV adhesive for plastics (medium viscosity)); Permabond UV630 (low-viscosity plastics); Permabond UV645 (high-viscosity plastics); Permabond UV649 (plastic gel). For shadowed areas (where UV light does not fully reach the adhesive gap), a dual-cure variant such as Permabond UV7141 (UV + anaerobic) should be used.
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Product specifications
| Product information | |
|---|---|
| Container | 50 ml or 250 ml or 1 l or 2 l |
| Manufacturer | Permabond Engineering Adhesives Ltd |
| brand | Permabond |
| Country of origin | Italy |
| Performance at final strength | |
|---|---|
| Tensile strength (ISO37) | 13 N/mm² |
| Refractive index | >1,490 |
| Elongation at break (elasticity) (ISO37) | 110% |
| Dielectric strength | 25-30 KV/mm |
| Dielectric constant 1MHz at 25°C | 4 |
| Water absorption (ISO62) 2 hours in boiling water | <5% |
| Shear strength polycarbonate | >9 N/mm² |
| Physical properties | |
|---|---|
| Color | colorless |
| Chemical group | Methacrylic acid esters |
| Viscosity (adhesives) | Medium viscosity 500 - 5000 mPas |
| Viscosity 20rpm | 3000-5000 |
| Specific gravity | 1.1 |
| Curing values | |
|---|---|
| Curing wavelength | 365 - 420 nm |
| Mechanical properties | |
|---|---|
| Hardness (Shore D) | 55-75 |
| Shear strength ISO 4587 in N/mm² | |
|---|---|
| Acrylic | >1.5 N/mm² |
| Thermal properties | |
|---|---|
| Operating temperature (°C) | -55 to +120 |
| Storage temperature (°C) | 5-25 |
| Keywords | |
|---|---|
| Keywords | |
Documents and datasheets
Safety Data Sheets (SDS) and Technical Data Sheets (TDS) are available for download:
- Permabond UV640 - Technical Data Sheet FR.pdf (286 KB)
- Permabond UV640 - Fiche de Sécurité FR.pdf (478 KB)
- Permabond UV640 - Safety Data Sheet EN.pdf (474 KB)
- Permabond UV640 - Safety Data Sheet DE.pdf (479 KB)
- Permabond UV640 - Technical Data Sheet EN.pdf (319 KB)
- Permabond UV640 - Technical Data Sheet DE.pdf (308 KB)