Bomar Oligomers® BR-640D

1 of 88 products in this brand
Bomar™BR-640Dis a polybutadiene (PBD) urethane acrylate with a functionality of two. Designed to meet rigorous electronic applications, BR-640D has many desirable properties typical to PBD resins, combined with radiation curability. In applications requiring thermal cycling resistance, BR-640Dwithstands the extremes of temperature typical of such tests, without undue degradation of properties.Excellent hydrophobic properties exhibited where 0.012 and 0.037% water was absorbed by cured coating when submerged in water for 24 hours. In addition to the adhesion properties, BR-640D showed excellent adhesion to ABS, acrylic, nylon-6, PVC, and PS.

Chemical Family: Urethane Acrylate/Isocyanate

Technical Data Sheet
  • TypeDocument Name
View All Documents

Knowde Enhanced TDS

Identification & Functionality

Technologies

Features & Benefits

Product Highlights
  • Excellent Hydrophobic Properties
  • Acid/Base Resistant
  • Low Water Absorption
  • Low Temperature Flexibility
  • Excellent Dielectric Properties

Applications & Uses

Recommended Application
  • Electronic Coatings
  • Potting Compounds
  • Anti-fog Coatings & Inks

Properties

Uncured Properties
ValueUnitsTest Method / Conditions
Viscosity (50 °C)9,000cP
Pt-Co Color (APHA)20
Pt-Co Color20APHA
Refractive Index (25°C)1.48
Density (25°C)0.94g/cm3

Technical Details & Test Data

Viscosity Reduction with Reactive Diluents

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* 15,000 1,500 60 9,900
Cured Mechanical Properties
Property I30 I50 TM50 TP50 H50 HE30

Tensile Strength, psi**

500 800 1 500
Elongation, 6** 190 190 10 60

Elastic Modulus, ksi*

0.27 0.65 35 17

Durometer Hardness

76A 45D 66D 45D

Water Absorption, 96 (24 hrs)

0.01 0.04 0.09 0.85

MEK Double Rubs (#)

65 9 >200 10
Tg(DMA)=89°C; Peak tan delta; cured with 2 phr of Omnirad® 184

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

Cold Rolled Steel

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

X - Recommended, XX - Highly Recommended, XXX - Strongly Recommended

Viscosity Reduction with Reactive Diluents

Bomar Oligomers® BR-640D - Viscosity Reduction With Reactive Diluents