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Bomar Oligomers® BR-371B

1 of 88 products in this brand

BR-371B, a low molecular weight, difunctional, aliphatic polyether urethane acrylate oligomer, is a great fit for coatings that require high tensile strength, superior hardness, scratch resistance, and weathering resistance. Formulations with BR-371B yield hard, clear, low-yellowing films. This is a reduced MEHQ version of BR-371S.

Chemical Family: Urethane Acrylate/Isocyanate

Technical Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

CASE Ingredients Functions
Technologies

Features & Benefits

Features
  • High tensile strength
  • Superior hardness
  • Excellent adhesion to plastics
  • Low color
  • Fast cure speeds
  • Optical clarity

Applications & Uses

Compatible Substrates & Surfaces
Applications
  • Wood coatings
  • Rigid plastic coatings
  • Hard gel nail coatings

Properties

Uncured Properties
ValueUnitsTest Method / Conditions
Viscosity (at 60°C)67,000cP
Color (Pt-Co)max. 100APHA
Refractive Index (at 25°C)1.497
Density (at 25°C)1.10g/cm3

Technical Details & Test Data

Test Data

Adhesion Properties

Substrate I30 I50 TM50 TP50 H50 HE30
ABS X X XXX XX XXX X
Aluminum            

Cold Rolled Steel

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

* Recommended ** Highly Recommended *** Strongly Recommended

Cured Mechanical Properties

Property I30 I50 TM50 TP50 H50 HE30

Tensile Strength, psi**

6,000 5,500 5,600 4,500 4,600 5,500
Elongation, 6** 4.3 4.1 2.6 42 3.7 41

Elastic Modulus, ksi*

250 230 290 210 190 250

Durometer Hardness

86D 87D 92D 85D 84D 88D

Water Absorption, 96 (24 hrs)

0.21 0.15 0.25 0.31 0.24 0.78

MEK Double Rubs (#)

>200 100 >200 >200 >200 >200
Tg(DMA)=89°C; Peak tan delta; cured with 2 phr of Omnirad® 184

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

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* 42,000 1,900 12,000 1,900 500 5,500

* Brookfield – CAP 2000+ @ 25°C.

 

Viscosity Reduction with Reactive Diluents

Bomar Oligomers® BR-371B - 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.