Silicones, silicone oils, sprays
Casting and potting resins)
HS Code:
3506.9190000
Technical Data
Typical values, not a specification. The technical data sheet (TDS) is binding.
Product Information
- Manufacturer
- Permabond Engineering Adhesives Ltd
- Brand
- Permabond
- Container
- 50 ml, 250 ml
- Country of origin
- Italy
- UFI (Unique Formula Identifier)
- RF11-80CY-H00G-Q0FA
Performance at Full Cure
- Tensile strength (ISO37)
- 20 N/mm²
- Elongation at break (elasticity) (ISO37)
- >220%
- Water absorption (ISO62) 2 hrs in boiling water
- 14%
- Shear strength polycarbonate
- >8 N/mm²
Physical Properties
- Color
- colorless
- Chemical group
- Methacrylate ester
- Viscosity (adhesives)
- Medium viscosity 500 - 5000 mPas
- Viscosity at 20 rpm
- 1300
Curing values
- Curing Wavelength
- 365 - 420 nm
Mechanical properties
- Hardness (Shore D)
- 35-45
Shear strength ISO 4587 in N/mm²
- Acrylic glass
- >6 N/mm²
- PETG
- >7 N/mm²
- PET
- >5 N/mm²
Thermal Properties
- Operating temperature (°C)
- -55 to +120
- Storage Temperature (°C)
- 5-25
Product Description
Permabond UV639 is a highly elastic, highly transparent UV-curing adhesive — specifically for acrylic, polycarbonate and PETG with an exceptional elongation at break of >220%.
With an elongation at break of >220%, UV639 is the most elastic UV adhesive in the Permabond range — values that standard UV adhesives (50–150%) cannot achieve. This flexibility buffers thermal expansion and contraction between different plastics.
The excellent adhesion to acrylic (>6 N/mm² substrate failure), polycarbonate (>8 N/mm² SV) and PETG (>7 N/mm² SV) makes UV639 the first choice for display, shop window and packaging applications with highly transparent plastics.
Highly elastic with over 220% elongation at break — its exceptional flexibility buffers thermal and mechanical stresses between plastics. Highly transparent for invisible bonding, low shrinkage.
What distinguishes Permabond UV639
What is Permabond UV639 used for?
Processing
Recommended accessories
Important Notes
Which Permabond UV adhesive for which application?
Permabond UV639 in direct comparison with related products of the UV series.
Permabond UV639 Current Product | Permabond UV630 → | Permabond UV632 → | Permabond UV6302 → | |
|---|---|---|---|---|
| Application | Highly elastic UV adhesive for acrylic/PETG/PC | Harder, biocompatible | Urethane chemistry | Low viscosity PC-specific |
| Viscosity | 1,300 mPa·s @ 20 rpm | 250 mPa·s | 200–400 mPa·s | 75 mPa·s |
| Substrate Strength | >8 N/mm² (substrate failure) | Polycarbonate | Polycarbonate | Polycarbonate |
| Elongation at break | >220 % | 110 % | >70 % | 100–150 % |
Frequently asked questions about Permabond UV639
Practical application and design questions — answered by SILITECH.
Permabond UV639 is a methacrylic acid ester (UV-curing, long-wavelength) adhesive with a viscosity of 1,300 mPa·s @ 20 rpm. This highly elastic UV adhesive offers >220% elongation at break for acrylic, polycarbonate, and PETG. The adhesive cures upon irradiation with UV light in the spectral range of 365–420 nm, providing instantaneous curing "on demand".
Permabond UV639 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.
The UV curing of Permabond UV639 depends on the lamp power, wavelength, and light transmittance of the components. Typical curing times range from seconds to a few minutes.
Permabond UV639 reliably bonds: Polycarbonate: >8 N/mm² (substrate failure); Acrylic: >6 N/mm² (SV); PETG: >7 N/mm² (SV); PET: >5 N/mm² (SV). For thermoplastic substrates, we recommend testing compatibility before series production — release agents on injection-molded parts can impair adhesion.
Permabond UV639 is a highly elastic UV adhesive for acrylic/PETG/PC (1,300 mPa·s @ 20 rpm viscosity, >220% elongation at break). Permabond UV630 is a standard biocompatible (250 mPa·s, 110% elongation at break) hardener.
When stored at 5 to 25 °C and protected from light, Permabond UV639 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 UV639 (Highly elastic UV adhesive for acrylic/PETG/PC); Permabond UV630 (Standard biocompatible); Permabond UV632 (Low viscosity urethane); Permabond UV6302 (Polycarbonate wicking). For shaded areas (where UV light does not fully reach the adhesive gap), a dual-cure variant such as Permabond UV7141 (UV + anaerobic) should be used.