Covestro Baytec® SPR-256D Polyurethane

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Covestro Baytec® SPR-256D Polyurethane
Categories:	Polymer; Thermoset; Polyurethane, TS
Material Notes:	Characterization: Baytec SPR-256D is a two-component, 100%-solids spray system with a Shore hardness of 56D.* Properties / Applications: Baytec SPR-256D is a two-component, 100%-solids spray system with a Shore hardness of 56D.* The isocyanate component is a modified diphenylmethane diisocyanate (MDI) prepolymer, and the polyol component is a polyether polyol blend. Baytec SPR-256D spray system is typically used for in-mold spray applications with polyurethane structural composites. As with any product, use of Baytec SPR-256D in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability. Information provided by Covestro
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Physical Properties	Original Value	Comments

Specific Gravity	1.04 g/cc	Polyol
	1.07 g/cc	ASTM D792
	1.14 g/cc	Isocyanate
Viscosity	600 cP	Isocyanate
	1500 cP	Polyol

Mechanical Properties	Original Value	Comments
Hardness, Shore D	56	ASTM D2240
Tensile Strength at Break	10.3 MPa @Treatment Temp. 120 °C, Time 18000 sec	Humid Aging, 100 % RH; GM 7001, X9588
	15.2 MPa @Treatment Temp. 120 °C, Time 1.81e+6 sec	Heat Aging; GM 7001M, W6655
Tensile Strength, Ultimate	2400 psi	ASTM D639
Elongation at Break	54 %	ASTM D412
	64 %	Humid Aging; GM 7001, K9588
Tear Strength	72.0 pli	Split Tear; ASTM D1938
	323 pli	Die C; ASTM D624
Taber Abrasion, mg/1000 Cycles	166 @Load 1.00 kg	H-18; ASTM D3489

Thermal Properties	Original Value	Comments
Flash Point	201 °C	Polyol
	210 °C	Isocyanate

Processing Properties	Original Value	Comments
Gel Time	0.0830 - 0.250 min

Descriptive Properties
Appearance	Clear amber liquid	Isocyanate
	Gray opaque liquid	Polyol
Content	19%	NCO, Isocyanate
Hydroxyl number	[mg KOH/g], Polyol

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