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Baydur® 641 IBS (20 pcf)

Polyurethane (MDI)

Supplied by Bayer MaterialScience LLC

The technical datasheet with complete property values for Baydur® 641 IBS (20 pcf) is available to members of the Prospector Plastics Database.
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Product Description
Baydur 641 IBS is a rigid polyurethane structural foam system used in the reaction injection molding (RIM) process. This system is supplied as two reactive liquid components and is typically used with a blowing paste purchased separately. Component A is a polymeric diphenylmethane diisocyanate (PMDI). Component B is a formulated polyol system containing no CFC- or HCFC-blowing additives. The blowing paste is Baydur PU-1731.

The Baydur 641 IBS system is used in the industrial and medical equipment markets for applications requiring dimensional stability and excellent surface finish, such as, rollers for photographic and X-ray film processing equipment. As with any product, use of Baydur 641 IBS 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
Features 
  • Good Dimensional Stability
  • Good Surface Finish
  
Uses 
  • Industrial Applications
  • Medical/Healthcare Applications
  • Structural Foam
Processing Method 
  • Reaction Injection Molding (RIM)
Physical
Nominal Value
Unit
Test Method
Specific Gravity
 
 ASTM D792
Molding Shrinkage - Flow (0.500 in)
in/in
 ASTM D955
Mechanical
Nominal Value
Unit
Test Method
Tensile Strength (Break, 0.500 in)
psi
 ASTM D638
Tensile Elongation (Break, 0.500 in)
%
 ASTM D638
Flexural Modulus (0.500 in)
psi
 ASTM D790
Flexural Strength (0.500 in)
psi
 ASTM D790
Compressive Strength (0.500 in)
psi
 ASTM D695
Impact
Nominal Value
Unit
Test Method
Charpy Unnotched Impact Strength 2
ft·lb/in²
 Internal Method
Hardness
Nominal Value
Unit
Test Method
Durometer Hardness (Shore D, 0.500 in)
 
 ASTM D2240
Thermal
Nominal Value
Unit
Test Method
Deflection Temperature Under Load (66 psi, Unannealed, 0.500 in)
°F
 ASTM D648
Thermoset
Nominal Value
Unit
Test Method
Thermoset Components
      
Part A
 
  
Part B
 
  
Additional Information
Part A
  • Type: Isocyanate
  • Appearance: Dark brown 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: Pale yellow liquid
  • Specific Gravity @ 25°C: 1.02
  • Viscosity @25°C: 2000 cps
  • Flash Point PMCC: 187°C
  • Water: 0.45 wt%
  • Hydroxyl Number: 367 KOH/g

Material Temperatures: 27 to 35°C
Mold Temperature: 60 to 70°C

Hand Mix Reactivity at 25°C
  • Cream Time: 8 to 13 sec
  • Gel Time: 15 to 25 sec
  • Tack Free Time: 23 to 28 sec
  • Free-Rise Density: 7.5 to 10 lb/ft³

Polyol Nucleation Specific Gravity: 0.85 to 0.90 0
Typical cure Time, 0.500 in Thickness: 4 sec
Related Terminology
Product names can be difficult to match. You may have searched any one of these terms to find this product: Baydur® 641 IBS, Baydur 641 IBS, Baydur® 641 IBS (20 pcf), Baydur 641 IBS 20 pcf, Baydur® , Baydur, Baydur641IBS20pcf, 641 IBS, 641 IBS (20 pcf), 641 IBS 20 pcf, 641IBS, IBS20, 20pcf, 641IBS20pcf, Polyurethane, Polyurethane (MDI), Polyurethane MDI, PUR-MDI, PURMDI, PUR:MDI, PUR/MDI, PUR+MDI, PUR_MDI, PUR MDI, PUR, Bayer, PolyurethaneMDI, IBS641
Features
Features may also be described by the following terms: Good Dimensional Stability, Dimensionally Stable, Good Surface Finish.
Uses
Uses may also be described by the following terms: Medical Applications, Structural Foam.
Notes
1Typical properties: these are not to be construed as specifications.
20.5 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.