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Baydur® 728 IBS (65 pcf)

Polyurethane (MDI)

Supplied by Bayer MaterialScience LLC

The technical datasheet with complete property values for Baydur® 728 IBS (65 pcf) is available to members of the Prospector Plastics Database.
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Product Description
Baydur 728 IBS is a high-density polyurethane structural foam system used in the reaction injection molding (RIM) process. This system incorporates a specially engineered interactive blowing system (IBS) and internal mold release (IMR). 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. Note: Component B phase separates upon standing and must be mixed thoroughly via mechanical means prior to use.

Baydur 728 IBS system is used in applications requiring a UL94 flammability rating* of V-0 and/or 5VA for use in electronic, equipment housing, and appliance markets. The applications typically take advantage of the material's strength, excellent surface finish, and large-part capability. As with any product, use of Baydur 728 IBS system in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability.
General  
Material Status 
  • Commercial: Active
Availability 
  • North America
Additive 
  • Blowing Agent
  • Mold Release
  
Features 
  • Good Strength
  • Good Surface Finish
  
Uses 
  • Appliances
  • Electrical/Electronic Applications
  • Housings
Processing Method 
  • Reaction Injection Molding (RIM)
Mechanical
Nominal Value
Unit
Test Method
Tensile Strength (Break, 0.125 in)
psi
 ASTM D638
Tensile Elongation (Break, 0.125 in)
%
 ASTM D638
Flexural Modulus (0.125 in)
psi
 ASTM D790
Flexural Strength (0.125 in)
psi
 ASTM D790
Impact
Nominal Value
Unit
Test Method
Charpy Unnotched Impact Strength 2
ft·lb/in²
 Internal Method
Notched Izod Impact (0.125 in)
ft·lb/in
 ASTM D256
Unnotched Izod Impact (0.125 in)
ft·lb/in
 ASTM D256
Thermal
Nominal Value
Unit
Test Method
Deflection Temperature Under Load (66 psi, Unannealed, 0.125 in)
°F
 ASTM D648
CLTE - Flow (158°F, 0.125 in)
in/in/°F
 ASTM D696
Flammability
Nominal Value
Unit
Test Method
Flame Rating - UL (0.125 in)
 
 UL 94
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

Part B
  • Type: Polyol
  • Appearance: Pale amber liquid
  • Specific Gravity @ 25°C: 1.108
  • Viscosity @25°C: 1000 cps
  • Flash Point PMCC: 161°C

Material Temperatures: 27 to 35°C
Mold Temperature: 66 to 76°C

Hand Mix Reactivity at 25°C
  • Cream Time: 19 to 29 sec
  • Gel Time: 28 to 39 sec
  • Tack Free Time: to 34 to 48 sec
  • Free-Rise Density: 12 to 20 lb/ft³

Machine Reactivity at 30°C
  • Cream Time: 6 to 12 sec
  • Gel Time: 15 to 19 sec
  • Tack Free Time: 19 to 22 sec
  • Free-Rise Density: 15 to 20 lb/ft³

Polyol Nucleation Specific Gravity: 0.85 to 0.90 0
Maximum Shot Time: 7 sec
Typical cure Time, 0.250 in Thickness: 3 to 4
Related Terminology
Product names can be difficult to match. You may have searched any one of these terms to find this product: Baydur® 728 IBS, Baydur 728 IBS, Baydur® 728 IBS (65 pcf), Baydur 728 IBS 65 pcf, Baydur® , Baydur, Baydur728IBS65pcf, 728 IBS, 728 IBS (65 pcf), 728 IBS 65 pcf, 728IBS, IBS65, 65pcf, 728IBS65pcf, Polyurethane, Polyurethane (MDI), Polyurethane MDI, PUR-MDI, PURMDI, PUR:MDI, PUR/MDI, PUR+MDI, PUR_MDI, PUR MDI, PUR, Bayer, PolyurethaneMDI, IBS728
Features
Features may also be described by the following terms: Good Surface Finish, Good Strength.
Uses
Uses may also be described by the following terms: Electrical Applications, Electronic Applications, Electrical/Electronic Applications, Electrical Sector, Housings, Housing.
Notes
1Typical properties: these are not to be construed as specifications.
20.125 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.