Bomar Oligomers® BR-643

1 of 88 products in this brand
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

Chemical Family: Urethane Acrylate/Isocyanate

End Uses: Radiation Curable Adhesive

Technical Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

CASE Ingredients Functions
Technologies

Features & Benefits

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

Adhesive & Sealant Type

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.