Silicones, silicone oils, sprays
Casting and potting resins)
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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, 2 l
- Country of origin
- Italy
- UFI (Unique Formula Identifier)
- ND10-10H8-N00A-8EGY
Performance at Full Cure
- Tensile strength (ISO37)
- 11 N/mm²
- Refractive index
- 1490
- Elongation at break (elasticity) (ISO37)
- >70%
- Dielectric Strength
- 25-30 KV/mm
- Dielectric constant 1MHz at 25°C
- 4
- Water absorption (ISO62) 2 hrs in boiling water
- <5%
- Shear strength polycarbonate
- >9 N/mm²
- Shear strength PVC
- >5 N/mm²
- Shear strength PC/ABS
- >7 N/mm²
Physical Properties
- Color
- colorless
- Chemical group
- Methacrylate ester
- Viscosity (adhesives)
- High viscosity >5000 mPas
- Viscosity at 20 rpm
- 8000-10000
- Specific Gravity
- 1.1
Curing values
- Curing Wavelength
- 365 - 420 nm
Mechanical properties
- Hardness (Shore D)
- 50-65
Shear strength ISO 4587 in N/mm²
- Acrylic
- >1.5 N/mm²
Thermal Properties
- Storage Temperature (°C)
- 5-25
Product Description
Permabond UV645 is the high-viscosity variant of the plastic UV adhesive range — designed for larger bonding gaps and vertical applications with polycarbonate, ABS, PVC and PMMA.
With viscosity values of 8,000–10,000 mPa·s @ 20 rpm and thixotropic viscosity values of 30,000–60,000 mPa·s @ 2.5 rpm, UV645 remains stationary even in vertical gaps. Its high viscosity covers coarse tolerances—where UV630 or UV640 would fail.
The polycarbonate affinity leads to substrate failure—the bond is stronger than the plastic itself. PVC and PC/ABS blends are also reliably bonded.
High-viscosity plastic UV adhesive variant — fills large gaps and remains stationary in vertical applications. Standard curing chemistry 365–420 nm for UV-stabilized substrates.
What distinguishes Permabond UV645
What is Permabond UV645 used for?
Processing
Recommended accessories
Important Notes
Which Permabond UV adhesive for which application?
Permabond UV645 in direct comparison with related products of the UV series.
Permabond UV645 Current Product | Permabond UV640 → | Permabond UV649 → | Permabond UV648 → | |
|---|---|---|---|---|
| Application | UV adhesive for plastics (high viscosity) | Lower viscosity | Paste-like, suitable for sealant | Urethane methacrylate tough-elastic. |
| Viscosity | 8,000–10,000 mPa·s @ 20 rpm / 30,000–60,000 mPa·s @ 2.5 rpm | 3'000–5'000 mPa·s | 20,000–30,000 mPa·s | 20,000–40,000 mPa·s |
| Substrate Strength | >9 N/mm² (substrate failure) | Polycarbonate | PC/ABS | Polycarbonate |
| Elongation at break | >70 % | 110 % | >70 % | >70 % |
Frequently asked questions about Permabond UV645
Practical application and design questions — answered by SILITECH.
Permabond UV645 is a methacrylic acid ester (UV-curing, long-wavelength) adhesive with a viscosity of 8,000–10,000 mPa·s @ 20 rpm / 30,000–60,000 mPa·s @ 2.5 rpm. This UV adhesive for plastics is a high-viscosity variant with improved gap-filling properties. The adhesive cures upon irradiation with UV light in the spectral range of 365–420 nm—curing in seconds, "on demand.".
Permabond UV645 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 UV645 depends on the lamp power, wavelength, and light transmittance of the components. Typical curing times range from seconds to a few minutes.
Permabond UV645 bonds reliably to: Polycarbonate: >9 N/mm² (substrate failure); PVC: >5 N/mm². For thermoplastic substrates, we recommend testing compatibility before series production — release agents on injection-molded parts can impair adhesion.
Permabond UV645 is a UV adhesive for plastics (high viscosity) (8,000–10,000 mPa·s @ 20 rpm / 30,000–60,000 mPa·s @ 2.5 rpm viscosity, >70% elongation at break). Permabond UV640 is for medium-viscosity plastics (3,000–5,000 mPa·s, 110% elongation at break) — lower viscosity.
When stored at 5 to 25 °C and protected from light, Permabond UV645 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 UV645 (UV adhesive for plastics (high viscosity)); Permabond UV640 (medium viscosity plastics); Permabond UV649 (gel plastics); Permabond UV648 (high viscosity urethane). 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.