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Baydur® 646 (30 pcf)

Polyurethane (MDI)

Supplied by Bayer MaterialScience LLC

The technical datasheet with complete property values for Baydur® 646 (30 pcf) is available to members of the Prospector Plastics Database.
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Product Description
Baydur 646 is a rigid polyurethane structural foam system used in the reaction injection molding (RIM) process. The system is supplied as two reactive liquid components: Component A is a polymeric diphenylmethane diisocyanate (PMDI), and Component B is a formulated polyol system containing no CFC- or HCFC-blowing additives.

The Baydur 646 system is used to produce foam cores for composite applications, such as water skis, wake boards, snow boards, and various components for the transportation and marine markets. As with any product, use of the Baydur 646 system in a given application must be tested (including field testing, etc.) in advance by the user to determine suitability.
General  
Material Status 
  • Commercial: Active
Availability 
  • North America
Uses 
  • Automotive Applications
  • Marine Applications
  • Sporting Goods
  • Structural Foam
  
Processing Method 
  • Reaction Injection Molding (RIM)
Physical
Nominal Value
Unit
Test Method
Specific Gravity
 
 ASTM D792
Molding Shrinkage - Flow (0.250 in)
in/in
 ASTM D955
Mechanical
Nominal Value
Unit
Test Method
Tensile Strength
     ASTM D638
Break, 0.250 in
psi
  
Break, 0.500 in
psi
  
Tensile Elongation
     ASTM D638
Break, 0.250 in
%
  
Break, 0.500 in
%
  
Flexural Modulus
     ASTM D790
0.250 in
psi
  
0.500 in
psi
  
Flexural Strength
     ASTM D790
0.250 in
psi
  
0.500 in
psi
  
Compressive Strength
     ASTM D695
0.250 in
psi
  
0.500 in
psi
  
Impact
Nominal Value
Unit
Test Method
Charpy Unnotched Impact Strength
     Internal Method
-- 2
ft·lb/in²
  
-- 3
ft·lb/in²
  
Hardness
Nominal Value
Unit
Test Method
Durometer Hardness
     ASTM D2240
Shore D, 0.250 in
 
  
Shore D, 0.500 in
 
  
Thermoset
Nominal Value
Unit
Test Method
Thermoset Components
      
Part A
 
  
Part B
 
  
Additional Information
Part A
  • Type: Isocyanate
  • Appearance: Dark brown to black liquid
  • Specific Gravity @ 25°C: 1.24
  • Viscosity @25°C: 200 cps
  • Flash Point PMCC: 199°C
  • NCO: 31.5 wt%

Part B
  • Type: Polyol
  • Appearance: Amber liquid
  • Specific Gravity @ 25°C: 1.08
  • Viscosity @25°C: 1200 cps
  • Flash Point PMCC: 123°C
  • Water: 1.05 wt%
  • Hydroxyl Number: 370 KOH/g

Material Temperatures: 29 to 38°C
Mold Temperature: 50 to 60°C

Hand Mix Reactivity at 25°C
  • Cream Time: 30 to 40 sec
  • Gel Time: 65 to 75 sec
  • Tack Free Time: 77 to 85 sec
  • Free-Rise Density: 5 to 7 lb/ft³

Machine Reactivity at 30°C
  • Cream Time: 10 to 20 sec
  • Gel Time: 30 to 40 sec
  • Tack Free Time: 50 to 60 sec
  • Free-Rise Density: 5 to 7 lb/ft³

Polyol Nucleation Specific Gravity: 0.8 to 0.9 0
Typical cure Time, 0.500 in Thickness: 4 to 5 sec
Molded Density: 10 to 30 lb/ft³
Related Terminology
Product names can be difficult to match. You may have searched any one of these terms to find this product: Baydur® 646, Baydur 646, Baydur® 646 (30 pcf), Baydur 646 30 pcf, Baydur® , Baydur, Baydur64630pcf, 646, 646 (30 pcf), 646 30 pcf, 64630, 30pcf, 64630pcf, Polyurethane, Polyurethane (MDI), Polyurethane MDI, PUR-MDI, PURMDI, PUR:MDI, PUR/MDI, PUR+MDI, PUR_MDI, PUR MDI, PUR, Bayer, PolyurethaneMDI, 30646
Uses
Uses may also be described by the following terms: Structural Foam, Automotive Applications, Automotive Sector.
Notes
1Typical properties: these are not to be construed as specifications.
20.5
30.25 in
 
IDES
Copyright © 2012 IDES
The information presented on this datasheet was acquired by IDES from the producer of the material. IDES makes substantial efforts to assure the accuracy of this data. However, IDES assumes no responsibility for the data values and strongly encourages that upon final material selection, data points are validated with the material supplier.