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Bomar Oligomers® BR-990S2

1 of 88 products in this brand

BR-990S2 is a dual-functional urethane acrylate with isocyanate functional groups. While products formulated with BR-990S2 can be cured with a UV light source, a free isocyanate can also react with ambient moisture to complete the curing process. This UV+moisture curing process will benefit applications where shadow areas are present. BR—990S2 can also be used as a component in a 2K UV+Heat curable product, the other component being a polyol, glycol, or other compound with OH functional groups. A diol, or compound with two OH groups, will exhibit the best properties because it enables chain growth rather than chain termination. BR-990S2 exhibits good flexibility and develops good tensile strength when cured using both UV light and moisture. More flexible products can also be formulated with BR-990S2, different polyols, and UV+heat curing processes.

Technical Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

CASE Ingredients Functions

Features & Benefits

Features
  • Flexible dual cure oligomer
  • Low viscosity
  • Non yellowing
  • Good adhesion to plastics and steel
  • Excellent hydrolytic stability
  • Good weatherability

Applications & Uses

Markets
Compatible Substrates & Surfaces
Cure Method
Applications
  • UV+Moisture cure applications for shadowed areas
  • UV+Heat applications for dual cure properties
  • Plastic and steel adhesives
  • Dual cure 3D printing resins

Properties

Typical Properties
ValueUnitsTest Method / Conditions
Avg. Acrylate Functionality1
Density (at 25°C)1.13g/cm3
Refractive Index (at 25°C)1.49
NCO10%
Viscosity (at 60°C)2cP

Regulatory & Compliance

Certifications & Compliance

Technical Details & Test Data

UV + Moisture Cure Properties
Property UV Only Molsture Only UV+ Moisture
Tensile Strength, psi** 70 300 4,400
Elongation, % ** 20 30 50
Elastic Modulus, ksi* 0.19 6.1 150
Durometer Hardness 57A 58A 68A
Water Absorption, % (24 hrs) 0.35 N/A* 0.2
MEK Double Rubs (#) 7 23 70
Viscosity (cPs) 400 400 400

BR-990S2 diluted in 30% IBOA, cured with 2 phr of OmniradTM 184 (No photoinitiator in Moisture Only)

  • For UV cured materials, two passes at 20 ft/min under Fusion D bulb, 2.1 inches.
  • Moisture cure for 11 days at 25 C/50%RH, when NCO peak was gone on IR.
  • Tensile strips are ~10 mils/250 microns
UV + Heat Cure Test Formulation
Test Formulation Name Part A Part B
PPG Diol (265 OH#) 38.3  
BR-99052   79.25
IBOMA (fresh) 56.3 20.75
Omnirad™ 184 4.6  
Omnirad™ 819 0.46  
DBTDL 0.38  
Viscosity, 25'C (CPs) 10 900
UV + Heat Cure Properties
Property UV Only UV + Heat
Tensile Strength, psi** 1,200 1,700
Elongation, 6** 95 110
Elastic Modulus, ksi* 11.9 14.5
Durometer Hardness 44D 470
Water Absorption, 9% (24 hrs) 0.52 0.49
MEK Double Rubs (#) 4 3
Viscosity (cPs) 140 140

Ratio of 1:1 Part A:Part B UV cured with OmniradTM 184 and 819

** Per ASTM D882

Cured Mechanical Properties
Property I30 I50 TM50 TP50 H50 HE30
Tensile Strength, psi** 65 165 2,900 370 600 2
Elongation, %** 25 65 2.8 6.5 2.8 40
Elastic Modulus, ksi* 0.19 0.34 1000 6.5 20 40
Durometer Hardness 57A 80A 83D 46D 670 81D
Water Absorption, % (24 hrs) 0.35 0.24 0.35 0.5 0.36 1
MEK Double Rubs (#) 7 10 >200 13 107 >200
Tg(DMA)=-8°C; Peak tan delta; cured with 2 phr of Omnirad® 184  

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

Adhesion Properties
Substrate I30 I50 TM50 TP50 H50 HE30
ABS ** * ***   *** *
Aluminum ** *     *  
Cold Rolled Steel * ***   * *** ***
Glass   *       *
HDPE            
PET * *   *** *** ***
PMMA * *     * *
Polycarbonate * * ***   ***  
Polypropylene            
PVC * ** *** * ***  
Stainless Steel   *     * ***

* Recommended ** Highly Recommended *** Strongly Recommended

Typical Formulations
Test Formulation Name 130 160 TM50 TP50 H50 HE30
BR-146 70 50 50 50 50 70
IBOA 30 50        
TMPTA     50      
TPGDA       50    
HODA         50  
HEMA           30
Omniradw 184 2 2 2 2 2 2
Viscosity, 25C 400 130 600 160 80 240

* Brookfield – CAP 2000+ @ 25°C.

Viscosity Reduction with Reactive Diluents

Bomar Oligomers® BR-990S2 - Viscosity Reduction With Reactive Diluents

Safety & Health

Safety

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.

Packaging & Availability