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Bomar Oligomers® BR-345

1 of 88 products in this brand
Bomar™ BR-345 is a difunctional polyether urethane acrylate that provides unique properties for 3D printing resins. This soft material is ideal for use in applications where high elongation is desired, and can be used as an additive for impact resistance. Resins with less than 1000 cps can be formulated with this material when monomer levels are above 50%.

Chemical Family: Urethane Acrylate/Isocyanate

Technical Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

Base Chemicals Functions
CASE Ingredients Functions

Features & Benefits

Features
  • Color stability for better esthetics
  • Easy to paint or finish for better looking products
  • Extreme flexibility
  • Low Tg and very high elongation
  • Soft surface hardness
  • High elongation for impact resistance

Applications & Uses

Base Chemicals End Uses
Applications
  • Flexible 3D printing resins
  • Flexibilizing agent for rigid coatings

Properties

Uncured Properties
ValueUnitsTest Method / Conditions
Density (25 °C)1.06g/cm3
Pt-Co Color(APHA)max. 50
Pt-Co Colormax. 50APHA
Refractive Index (25°C)1.49
Viscosity (25 °C)46000cP

Technical Details & Test Data

Typical Formulations
Test FormulationName I30 I50 TP50 TM50 H50 HE30
BR-345 70 50 50 50 50 70
IBOA 30 50        
TMPTA       50    
TPGDA     50      
HDDA         50  
HEMA           30
Omnirad™ 481 2 2 2 2 2 2
Viscosity, 25°C  5,500 1,400 4,800 1,500 900 4,200
Cured Mechanical Properties : 
Property I30 I50 TP50 TM50 H50 HE30
Tensile Strength, psi 95 600 1,500 1,100 1,100 110
Elongation, % 120 400 2.6 19.4 6.5 290
Elastic Modulus, ksi 0.15 0.66 65 20 25
Durometer Hardness 21A 32A 61D 36D 93A 25A
Water Absorption (24hrs) 1.21 0.82 1.69 1.51 1.29 6.82
MEK Double Rubs (#) 4 4 10 5 6 10
Tg(DMA)=-42°C;Peak tan delta; cured with 2 phr of Omnirad™ 184
Adhesion Properties : 
Substrate I30 I50 TP50 TM50 H50 HE30
Aluminum   X X   X  
Cold Rolled Steel   X       XX
Glass           X
HDPE            
Polycarbonate   X XXX XX X  
PET   XX X X X XX
PMMA     XX X X  
PVC   X X   X  
Stainless Steel   X        

 

X Recommended XX Highly Recommended XXX Strongly Recommended

Viscosity Reduction with Reactive Diluents

Dymax Corporation Bomar BR-345 Viscosity Reduction with Reactive Diluents