Bomar Oligomers® BR-641D

1 of 88 products in this brand

Bomar™ BR-641D is a Polybutadiene (PBD) urethane acrylate, which was designed to meet rigorous electronic coating applications. This oligomer has exceptional adhesion to various metals, glass,and polycarbonate substrates. BR-641D has many desirable properties that are typical to PBD resins, combined with radiation curability. In applications requiring thermal cycling resistance, BR-641D withstands the extremes of temperature typical of such tests, without undue degradation of properties. In addition to the adhesion properties listed in the table below, BR-641D showed excellent adhesion to PMMA, ABS, PVC, Nylon-6, Polystyrene,and Polypropylene.

Chemical Family: Urethane Acrylate/Isocyanate

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
  • Potting Compounds
  • Acid/Base Resistance
  • Excellent Dielectric Properties
  • Exception Elongation
  • Exhibits Hydrolytic Stability
  • Outstanding Adhesion
  • Gloss Finish
  • Low Water Absorption

Applications & Uses

Compatible Substrates & Surfaces

Properties

Uncured Properties
ValueUnitsTest Method / Conditions
Viscosity (60 °C)15,000cP
Pt-Co Color (APHA)max. 100
Pt-Co Colormax. 100APHA
Refractive Index (25°C)1.48
Density (25°C)0.93g/cm3

Technical Details & Test Data

Typical Formulations

Adhesion Properties

Substrate I30 I50 TM50 TP50 H50 HE30
ABS X  
Aluminum    

Cold Rolled Steel

  XX
Glass   X
HDPE    
PET   X
PMMA    
Polycarbonate    
Polypropylene    
PVC XX  
Stainless Steel   XXX

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* 12,000 1,600

* Brookfield – CAP 2000+ @ 25°C.

Cured Mechanical Properties

Property I30 I50 TM50 TP50 H50 HE30

Tensile Strength, psi**

700 1,100
Elongation, 6** 300 400

Elastic Modulus, ksi*

0.2 0.3

Durometer Hardness

85A 54D

Water Absorption, 96 (24 hrs)

0.06 0.06

MEK Double Rubs (#)

60 40
Tg(DMA)=-20°C; Peak tan delta; cured with 2 phr of Omnirad® 184

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

Viscosity Reduction with Reactive Diluents

Bomar Oligomers® BR-641D - Viscosity Reduction With Reactive Diluents

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.