Bomar Oligomers® BR-641E

1 of 88 products in this brand
Bomar®BR-641E is a polybutadiene urethane acrylate oligomer designed for rigorous electronic coating, flexible ink,and pressure-sensitive adhesive applications. This oligomer is also perfect for extremely low water absorption applications. It is resistant to thermal cycling and can withstand the temperature extremes typical of such tests without undue degradation of properties.

Chemical Family: Urethane Acrylate/Isocyanate

End Uses: Pressure Sensitive Adhesive

Technical Data Sheet

Knowde Enhanced TDS

Identification & Functionality

CASE Ingredients Functions
Technologies

Features & Benefits

Product Highlights
  • Excellent Flexibility
  • Excellent Moisture Resistance
  • Pressure-Sensitive Adhesives
  • Extremely Low Water Absorption
  • Excellent Heat Resistance
  • Electronic Coatings
  • High Temperature Resistance
  • Excellent Light Stability
  • High Chemical Resistance

Applications & Uses

Adhesive & Sealant Type

Properties

Uncured Properties
ValueUnitsTest Method / Conditions
Viscosity (60 °C)25,000cP
Refractive Index (25°C)1.477
Pt-Co Color18APHA
Density (25°C)0.882g/cm3

Technical Details & Test Data

Viscosity Reduction with Reactive Diluents

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

Typical Formulations

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

Cold Rolled Steel

  XXX
Glass   XX
HDPE    
PET   XX
PMMA   XX
Polycarbonate   XX
Polypropylene   X
PVC   XX
Stainless Steel   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* 16,000 2,600

* Brookfield – CAP 2000+ @ 25°C.

Cured Mechanical Properties
Property I30 I50 TM50 TP50 H50 HE30

Tensile Strength, psi**

50 350
Elongation, 6** 85 400

Elastic Modulus, ksi*

0.07 0.22

Durometer Hardness

42A 60A

Water Absorption, 96 (24 hrs)

0.02 0.03

MEK Double Rubs (#)

32 12
Tg(DMA)=-28°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.