Bayflex® WR-20

About
Bayflex WR-20 is a solid elastomer which has a flexural modulus of 3,000 psi (21 MPa) at room temperature. It is processed on reaction injection molding (RIM) equipment and is used for rollers, gaskets, and encapsulated windows. This system combines rapid demold times, excellent integrity at demold, improved release characteristics, and outstanding physical properties.The Bayflex WR-20 system was developed to add a weather-resistant grade to our range of window encapsulation systems. In some cases, the weatherability of this system eliminates the need for post-painting or in-mold coatings. This product is available only in black. Bayflex WR-20 is a formulated RIM system supplied as two reactive liquid components. Component A is a diphenylmethane diisocyanate (MDI) prepolymer, and Component B is a polyether polyol. As with any product, use of the Bayflex WR-20 system in a given application must be tested (including field testing, etc.) in advance by the user to determine suitability.&&

About

Bayflex WR-20 is a solid elastomer which has a flexural modulus of 3,000 psi (21 MPa) at room temperature. It is processed on reaction injection molding (RIM) equipment and is used for rollers, gaskets, and encapsulated windows. This system combines rapid demold times, excellent integrity at demold, improved release characteristics, and outstanding physical properties.The Bayflex WR-20 system was developed to add a weather-resistant grade to our range of window encapsulation systems. In some cases, the weatherability of this system eliminates the need for post-painting or in-mold coatings. This product is available only in black. Bayflex WR-20 is a formulated RIM system supplied as two reactive liquid components. Component A is a diphenylmethane diisocyanate (MDI) prepolymer, and Component B is a polyether polyol. As with any product, use of the Bayflex WR-20 system in a given application must be tested (including field testing, etc.) in advance by the user to determine suitability.&&

Product Description
Supplier	Covestro
Generic	PUR-脂肪族+MDI
Material Status	Commercial: Active
Features	Weather resistance is good,Good stripping performance
Availabilitys	Africa & Middle East ,North America,Latin America,Asia Pacific,Europe

Technical Data
PHYSICAL	Nominal value	Unit	Test method
Density	1.00	g/cm³	ASTM D1622
Water absorption rate
10days	7.4	%	Internal Method
24hr	3.8	%	Internal Method

elastic body	Nominal value	Unit	Test method
tensile strength
fracture	11.0	MPa	ASTM D412
Tensile strain
fracture	450	%	ASTM D412
tear strength	33.3	kN/m	ASTM D624

Supplementary information	Nominal value	Unit	Test method
Water Immersion，Length Increase	1.6	%	Internal Method

MECHANICAL	Nominal value	Unit	Test method
Shore hardness
Shaw’s A	70		ASTM D2240
Bending modulus			ASTM D790
-30℃	60.7	MPa	ASTM D790
23℃	20.7	MPa	ASTM D790
65℃	17.2	MPa	ASTM D790

THERMAL	Nominal value	Unit	Test method
Low temperature brittleness
-50℃	No Cracking		ASTM D746
Thermosetting components
Component A	按重量计算的混合比: 30
Component B	按重量计算的混合比: 100
stripping time	0.50	min

Notes
1. Typical properties: these are not to be construed as specifications.
2. Die C
3. 105 Index
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