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Bomar Oligomers® BR-643

Bomar®BR-643 is a polybutadiene (PBD) urethane acrylate. Designed to meet rigorous electronic applications, BR-643 has many desirable properties typical to PBD resins, combined with radiation curability. In applications requiring thermal cycling resistance, BR-643 withstands the extremes of temperature typical of such tests,without undue degradation of properties

Brand: Bomar Oligomers (88 products)

Chemical Family: Urethane Acrylate/Isocyanate

End Uses: Radiation Curable Adhesive

Technical Data Sheet

Enhanced TDS

Knowde-enriched technical product data sheet

Identification & Functionality

Chemical Family
Urethane Acrylate/Isocyanate
CASE Ingredients Functions
Oligomer
Technologies
CASE Ingredients
Product Families
CASE Ingredients — Monomers & Intermediates
Oligomers

Features & Benefits

CASE Ingredients Features
Acid Resistance,
Alkali Resistance,
Good Hydrolysis Resistance,
High Dielectric Properties,
High Gloss,
Improves Adhesion,
Low Temperature Flexibility,
Low Water Absorption
Product Highlights
  • Excellent Hydrophobic Properties
  • Low Temperature Flexibility
  • Acid/Base Resistance
  • Excellent Dielectric Properties
  • Curable with Radiation
  • Exhibits Hydrolytic Stability
  • Improves Adhesion
  • Gloss Finish
  • Low Water Absorption

Applications & Uses

Markets
Electrical & Electronics,
Paints & Coatings
Applications
Electrical & Electronics — Packaging & Assembly
Electronics Coatings,
Potting Compounds
Paints & Coatings — Specialty Coatings
Electronics Coatings
Adhesive & Sealant Type
Radiation Curable Adhesive

Properties

Uncured Properties
ValueUnitsTest Method / Conditions
Viscosity (50 °C)65,000cP-
Pt-Co Color (APHA)50--
Pt-Co Color50APHA-
Refractive Index (25°C)1.508--
Density (25°C)0.95g/cm3-

Technical Details & Test Data

Viscosity Reduction with Reactive Diluents

Bomar Oligomers® BR-643 - Viscosity Reduction With Reactive Diluents

Typical Formulations

Adhesion Properties
Substrate I30 I50 TM50 TP50 H50 HE30
ABS     ‖ XXX XXX -
Aluminum     ‖     -

Cold Rolled Steel

 X X ‖     -
Glass   X ‖     -
HDPE     ‖     -
PET     ‖     -
PMMA     ‖     -
Polycarbonate     ‖   XX -
Polypropylene     ‖     -
PVC     ‖   XX -
Stainless Steel X XX ‖     -

X Recommended XX Highly Recommended XXX Strongly Recommended

Typical Formulations
Test Formulation Name 130 150 TM50 TP50 H50 HE30
BR-742M 70 50 50 50 50 70
IBOA 30 50        
TMPTA     50      
TPGDA       50    
HDDA         50  
HEMA           30
Omnirad 184 2 2 2 2 2 2
Viscosity, 25°C* 19,000 2,100 ‖ 2,300 900 —

* Brookfield – CAP 2000+ @ 25°C.

Cured Mechanical Properties
Property I30 I50 TM50 TP50 H50 HE30

Tensile Strength, psi**

 1,100 3 ‖ 2,000 1,500 -
Elongation, 6** 55 65 ‖ 25 3 -

Elastic Modulus, ksi*

 7.7 80 ‖ 40 65 -

Durometer Hardness

 84A 58D ‖ 69D 76D -

Water Absorption, 96 (24 hrs)

 0.04 0.03 ‖     -

MEK Double Rubs (#)

 10 7 ‖ 40 >200 -
Tg(DMA)=-16°C; Peak tan delta; cured with 2 phr of Omnirad® 184

** Per ASTM D882 – Not Tested || Incompatible X Unable to Measure

Safety & Health

General Information

This product is intended for industrial use only. Keep out of the reach of children. Avoid breathing vapors. Avoid contact with skin, eyes, and clothing. Wear impervious gloves. Repeated or continuous skin contact with uncured material may cause irritation. Remove material from skin with soap and water. Never use organic solvents to remove material from skin and eyes. For more information on the safe handling of this material, please refer to the Safety Data Sheet before use.