Baydur® 661 IBS (45 pcf, 20% Wollastocup) Bayer Polyurethane (MDI)

Product Description

Baydur 661 IBS is a gray-pigmented, rigid polyurethane structural foam system used in the reaction injection molding (RIM) process. This system incorporates a specially engineered interactive blowing system (IBS) and 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 should be agitated thoroughly prior to delivery of drum contents to day tank due to possible pigment settling.

The Baydur 661 IBS system is used in transportation, industrial, and recreational markets. The applications typically take advantage of the material's strength, excellent surface finish, and large-part capability. As with any product, use of the Baydur 661 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 Strength

Good Surface Finish

Uses

Industrial Applications

Structural Foam

Appearance

Grey

Processing Method

Reaction Injection Molding (RIM)

Physical	Nominal Value	Unit	Test Method
Specific Gravity			ASTM D792
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
Thermal	Nominal Value	Unit	Test Method
Deflection Temperature Under Load			ASTM D648
66 psi, Unannealed, 0.250 in		°F
66 psi, Unannealed, 0.500 in		°F
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: Medium gray liquid Specific Gravity @ 25°C: 1.11 Viscosity @25°C: 1800 cps Flash Point PMCC: 117°C Water: 0.35 wt% Material Temperatures: 32 to 35°C Mold Temperature: 55 to 66°C Hand Mix Reactivity at 25°C Cream Time: 16 to 26 sec Gel Time: 30 to 40 sec Tack Free Time: 50 to 60 sec Free-Rise Density: 13 to 15 lb/ft³ Polyol Nucleation Specific Gravity: 0.85 to 0.95 0 Recommended Shot Time: 5 to 6 sec Typical cure Time, 0.500 in Thickness: 5 sec
Related Terminology
Product names can be difficult to match. You may have searched any one of these terms to find this product: Baydur® 661 IBS, Baydur 661 IBS, Baydur® 661 IBS (45 pcf, 20% Wollastocup), Baydur 661 IBS 45 pcf 20 Wollastocup, Baydur® , Baydur, Baydur661IBS45pcf20Wollastocup, 661 IBS, 661 IBS (45 pcf, 20% Wollastocup), 661 IBS 45 pcf 20 Wollastocup, 661IBS, IBS45, 45pcf, pcf20, 20Wollastocup, 661IBS45pcf20Wollastocup, Polyurethane, Polyurethane (MDI), Polyurethane MDI, PUR-MDI, PURMDI, PUR:MDI, PUR/MDI, PUR+MDI, PUR_MDI, PUR MDI, PUR, Bayer, PolyurethaneMDI, IBS661
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: Structural Foam.

Notes

¹Typical properties: these are not to be construed as specifications.

²0.5

³0.25 in

Baydur® 661 IBS (45 pcf, 20% Wollastocup)

Polyurethane (MDI)

Supplied by Bayer MaterialScience LLC