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KX Flex™ 90

Fast Setting Urethane Casting Elastomer

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KX Flex™ 40

Fast Setting Urethane Casting Elastomer

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Key Differences

Mix Ratio By Volume	N/A (gram scale required)	1A:1B
Shore A Hardness	90	40
Color	Off-White	Translucent White
Tensile Strength	1,800 psi	457 psi
Elongation @ Break	125 %	400 %
Shrinkage	0.005 in. / in.	0.002 in. / in.

Disclaimer

Although we do our best to ensure accuracy, Smooth-On offers no warranties, promises, and/or representations of any kind, either expressed or implied, as to the accuracy, completeness, or reliability of the information contained on this Compare Tool, nor suitability of the information contained herein to your particular circumstances. Smooth-On assumes no liability for losses or damages of whatever nature (direct, indirect, consequential or other) associated with your use, or inability to use, the Compare Tool, or from your use (or failure to use) the information contained herein. Other useful tools include product technical bulletins and our extensive FAQ section. You can also contact our technical support team.

All Technical Data

	KX Flex™ 90	KX Flex™ 40
Product Type	Urethane Rubber Urethane Resins	Urethane Rubber Urethane Resins
Mixed Viscosity	800 cps	800 cps
Mix Ratio By Volume	—	1A:1B
Mix Ratio By Weight	100A:120B	1A:1B
Pot Life	2.5 minutes	2.5 minutes
Handling Time	30 minutes	30 minutes
Cure Time	24 hours	24 hours
Shore A Hardness	90	40
Specific Gravity	1.15 g/cc	1.07 g/cc
Specific Volume	24.1 cu. in./lb.	25.9 cu. in./lb.
Color	Off-White	Translucent White
Tensile Strength	1,800 psi	457 psi
Elongation @ Break	125 %	400 %
Shrinkage	0.005 in. / in.	0.002 in. / in.

Product Description

KX Flex™ 90

KX Flex™ Series urethanes are fast setting flexible urethane casting elastomers that cure quickly and offer exceptional physical and performance properties including high impact resistance. KX Flex™ Series urethanes are easy to color using SO-Strong™, UVO™ or IGNITE™ colorants. KX Flex™ urethanes are phthalate free, mercury free and MOCA free.

KX Flex™ Series urethanes have a pot life of 2.5 minutes and handling time of 30 minutes (depending on mass). With Shore hardness values of 40A, 60A and 90A, this material is used for a variety of applications including fast mold making, fast model duplication, prototyping, durable miniatures, props and special effects, or making parts that are impact resistant. Fully cured castings are flexible, tough and durable.