Poly-Fast 72-40 Liquid Rubber

Price:	$278.00

Poly-Fast 72-40 Liquid Rubber is a two-part, liquid polyurethane system that cures (RTV) to an ivory, Shore A40 rubber. This is a pourable rubber, but it can be easily thickened with Poly-Fast Part D Thickener or Fumed Silica for brush-on application.

Quantity

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This 49.5-lb kit includes:
4.5 lb of Poly-Fast 72-40 Part A (~2 quarts)
45 lb of Poly-Fast 72-40 Part B (~5 gallons)

Specifications & Product Information

Mix Ratio	Shore Hardness	Pour Time	Cured Color	Mixed Viscosity	Specific Volume	Demold Time	Shrinkage Upon Cure
1A:10B	A40	30 min.	Ivory	4,000 cP	20 in³/lb	~16 hr.	Nil

Notes:

This product may soften/degrade with age and should not be considered for molds where long shelf life is required. For mold rubber options that will not soften with age, consider Poly 74-Series polyurethane mold rubbers. Shake or stir Part A & Part B before use. This is a 1A:10B mix ratio product that must be measured by weight. The color of polyurethane Part Bs may change in color from batch to batch or may darken with age, but product performance is not affected. For additional physical property specifications, refer to the Physical Properties Bulletin.

Product Literature

Poly-Fast 72-40 Technical Bulletin

Physical Properties Bulletin

Safety Data Sheet - Part A

Safety Data Sheet - Part B & Part C

Accessories

Poly-Fast 72 Part D Thickener is a liquid additive that can be added to Poly-Fast 72-40 liquid rubber to thicken it for brush-on application.

Poly-Fast 72 Part D Thickener

Poly-Fast 72 Part C Softener is a liquid additive that can be added to Poly-Fast 72-40 liquid rubber to reduce the Shore A hardness.

Poly-Fast 72 Part C Softener

Add PolyFiber II to Polytek^® liquid polyurethane plastics or rubbers to thicken for brush-on application or to make mold shells.

PolyFiber II Thickener

A fine powder that can be added to polyurethane and silicone liquid rubbers to thicken them for brush-on/lay-up applications.

Fumed Silica

Spray PolyPurge dry gas into open containers of liquid polyurethane products just before resealing the lid.
PolyPurge displaces moist air, thus extending the life of the liquid product.

PolyPurge Dry Aerosol Gas

A silicone-based, aerosol spray release agent for use on non-porous or sealed models when making polyurethane rubber molds.
Not recommended for use with silicone mold rubbers.
Also apply to cured polyurethane molds when casting a variety of materials, including polyurethane liquid plastics, rubber and epoxies.

Pol-Ease^® 2300 Release Agent

Related Products

Poly 74-45 Liquid Rubber
Type: Polyurethane Rubber
Shore Hardness: A45
Mix Ratio: 1A:1B
Pour Time: 30 Minutes
Demold Time: 16 Hours
Color: Yellow

Poly 74-45 Liquid Rubber

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Poly-Fast 72-40 Liquid Rubber