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PERMABOND UV639

PERMABOND UV639

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UV-curing adhesive for glass/metal/plastic

Highly elastic UV adhesive — over 220% elongation at break, ideal for acrylic, polycarbonate and PETG.

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  • brand
  • Container
  • Color
  • Country of origin
  • Chemical group
  • Viscosity (adhesives)
  • Viscosity 20rpm
  • Curing wavelength
  • Operating temperature (°C)
  • Storage temperature (°C)
  • Tensile strength (ISO37)
  • Elongation at break (elasticity) (ISO37)
  • Hardness (Shore D)
  • Water absorption (ISO62) 2 hours in boiling water
  • Shear strength polycarbonate
  • Acrylic glass
  • PETG
  • PET
  • UFI (Unique Formula Identifier)

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UV-curing metal, plastic, glass

 
General Terms and Conditions.

Shipping usually within 1 to 3 business days
(availability will be confirmed after ordering)

. Express logistics. Fast and reliable within Switzerland & Europe.

Shipping from Swiss warehouse within 24 hours. Batch certificate. Invoice within 30 days (B2B). Technical support.
Shipping & Delivery

Usually 1 to 3 working days

Availability will be confirmed after order receipt.

Express logistics within Switzerland & Europe.

General Terms and Conditions →

Product data

Internal reference: 49-639.FL

HS code: 3506.9190000

Internal reference: 49-639.FL
HS code: 3506.9190000

PERMABOND UV639
PERMABOND UV639
Permabond · Permabond Engineering Adhesives Ltd · SKU 49-639.FL

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.

SPECIAL FEATURE

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.

Permabond UV639 in figures
>220 %
Elongation at break
35–45
Shore D soft
Highly transparent
Visually clear
Acrylic/PC/PETG
Specialized

What distinguishes Permabond UV639

>220% elongation at break
Highest elasticity in the UV series — buffers stresses.
Highly transparent
Clear adhesive seam — optically invisible.
Low shrinkage
Dimensionally stable — no stresses due to shrinkage.
Multi-substrate
PC, acrylic, PETG, PET — all with substrate failure.
Long-wave UV curing
365–420 nm — UV-stabilized substrates.
Tg 70 °C
Glass transition temperature for thermal stress.

What is Permabond UV639 used for?

Display and advertising
Acrylic display cases, shop windows, showcases.
Packaging industry
PETG adhesive for food and pharmaceutical packaging.
Highly elastic bonding
If standard UV were too brittle.
Polycarbonate components
Protective hoods, machine covers.
Components with thermal expansion
>220% reserve against stresses.

processing

1
Clean surfaces
Prepare bonding surfaces to be clean, dry, and free of grease — degrease with isopropanol or acetone. For aluminum/copper, lightly sand to remove the oxide layer. Test compatibility on plastics.
2
Apply adhesive thinly
Apply Permabond UV639 thinly and evenly – directly from the bottle or using a dispensing device. Keep the adhesive protected from light. Avoid air bubbles.
3
Adding and aligning components
Quickly and precisely assemble. When bonding glass, spread the adhesive into a thin film by applying pressure. Do not move components during UV curing.
4
Cure with UV light
Point the UV lamp at the adhesive gap. Curing time depends on the lamp power, wavelength, and light transmittance of the components — typically 1–5 seconds for a 30 W/cm² fiber optic system or 5–15 seconds for a 4 mW/cm² low-power lamp.
5
Full strength after UV irradiation
After complete UV curing, the components are immediately ready for handling. Final strength is achieved immediately after irradiation. For dual-cure products (UV + anaerobic), an additional 24 hours are required for complete anaerobic curing of the shaded areas.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

Recommended accessories

Permabond Cleaner A Aerosol
Spray cleaner for the rapid degreasing of bonding surfaces before applying UV adhesive — reliably removes oil, grease and release agents.
View product →
Permabond UV620 — glass standard
Optically clear glass-metal UV adhesive for high-quality glass furniture — the all-rounder of the UV range.
View product →
Permabond UV630 — Biocompatible plastic
UV adhesive for plastics (polycarbonate, acrylic) — biocompatible according to ISO 10993-5, long-wave curing 365–420 nm.
View product →
Permabond UV7141 — Dual-Cure UV+Anaerobic
UV + anaerobic dual curing for shaded areas — ceramic-coated glass, backlit mirrors, overlapping adhesive surfaces.
View product →

Important instructions

Not suitable for / Important notes
Store away from light. Provisional TDS — test compatibility before series production.
storage
Store at 5 to 25 °C and protect from direct sunlight. Curing begins under UV light — keep the bottle in the dark and open only under UV-blocked light.

Which Permabond UV adhesive is suitable 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 →
ApplicationHighly elastic UV adhesive for acrylic/PETG/PCHarder, biocompatibleUrethane chemistryLow viscosity PC-specific
viscosity1,300 mPa·s @ 20 rpm250 mPa·s200–400 mPa·s75 mPa·s
Substrate strength>8 N/mm² (substrate failure)PolycarbonatPolycarbonatPolycarbonat
Elongation at break>220 %110 %>70 %100–150 %
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
UV-curing metal, plastic, glass

Technical data for PERMABOND UV639

All 20 product information 5 Performance at final strength 4 Physical properties 4 Curing values ​​1 Mechanical properties 1 Shear strength ISO 4587 in N/mm² 3 Thermal properties 2
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 final strength
Tensile strength (ISO37) 20 N/mm²
Elongation at break (elasticity) (ISO37) >220%
Water absorption (ISO62) 2 hours in boiling water 14%
Shear strength polycarbonate >8 N/mm²
Physical properties
Color colorless
Chemical group Methacrylic acid esters
Viscosity (adhesives) Medium viscosity 500 - 5000 mPas
Viscosity 20rpm 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

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
Permabond UV639 - Technical Data Sheet DE.pdf
308 KB
Permabond UV639 - Technical Data Sheet EN.pdf
319 KB
Permabond UV639 - Fiche Technique FR.pdf
284 KB
Safety Data Sheets (SDS) 3
Permabond UV639 - Safety Data Sheet DE.pdf
480 KB
Permabond UV639 - Safety Data Sheet EN.pdf
475 KB
Permabond UV639 - Fiche de Sécurité FR.pdf
479 KB

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.

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Product specifications

Product information
Container 50 ml or 250 ml
Manufacturer Permabond Engineering Adhesives Ltd
brand Permabond
Country of origin Italy
UFI (Unique Formula Identifier) RF11-80CY-H00G-Q0FA
Performance at final strength
Tensile strength (ISO37) 20 N/mm²
Elongation at break (elasticity) (ISO37) >220%
Water absorption (ISO62) 2 hours in boiling water 14%
Shear strength polycarbonate >8 N/mm²
Physical properties
Color colorless
Chemical group Methacrylic acid esters
Viscosity (adhesives) Medium viscosity 500 - 5000 mPas
Viscosity 20rpm 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
Keywords
Keywords
UV-curing metal, plastic, glass

Documents and datasheets

Safety Data Sheets (SDS) and Technical Data Sheets (TDS) are available for download: