H.B. Fuller PHOTOCAP® 3650

H.B. Fuller PHOTOCAP® 3650 is an ultrafast-curing, PID-resistant thermoset polyolefin encapsulant with enhanced UV protection to ensure backsheet longevity. It has a low MVTR (moisture vapor transmission rate), a short lamination cycle, and excellent light transmission with no acetic acid concerns.

Polymer Name: Polyolefin Elastomer

Physical Form: Film

Tensile Strength: 14.0 - 14.0 MPa

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Chemical Family
Product Type

Features & Benefits

Applications & Uses

Plastics & Elastomers End Uses
Typical Applications

PHOTOCAP® 3650 is typically used in thin film or behind the cells in crystalline silicon module constructions, but is suitable anywhere moisture intake and transmission is a concern.

Lamination Instructions
  • Platen temperature: 140 - 150°C
  • Evacuation Time: 180 - 300 seconds
  • Cure Time: 300 - 360 seconds


Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Tensile Strength14.0MPaASTM D638
Shrinkage (Transverse direction)max. 1%IEC 62788
Ultimate Elongation1000.0%ASTM D638
Shrinkage (Machine direction)max. 3%IEC 62788
Adhesion (Glass)150.0N/cmHBF
Adhesion (Backsheet)80.0N/cmHBF
Moisture Vapor Transmission Ratemax. 5g/m²/24 hrsAFTM F1249
Water Absorptionmax. 0.05wt.%ASTM D570
Optical Transmission91.0%ASTM E424
UV Cut-off360.0nmASTM E424
Volume Resistivitymin. 5x 10¹⁶Ohm cmASTM D257
Dielectric Strength30.0KV/mmASTM D149
Comparative Tracking Index600.0VIEC 60112

Regulatory & Compliance

Regulatory Information

PHOTOCAP 3650 is a UL listed product in category QIHE2 Photovoltaic Polymeric Materials. Each HB Fuller manufacturing plant maintains a separate UL file. Please refer to UL file numbers E10488, E335471 and E335472.

Safety & Health

Safety Information

Avoid contact with skin and eyes. Product will irritate eyes if contact occurs. Skin irritation is possible on prolonged or repeated contact.

Packaging & Availability

Regional Availability
  • Africa
  • Europe (Excluding Russia)
  • India
  • Latin America
  • Middle East
  • North America

Storage & Handling

Storage Conditions

Clean and dry conditions below 40°C and 70% RH. For best performance, the product should be stored and used at 65°F – 85°F. Do not freeze.