PureCast 605 is a two-component liquid castable polyurethane elastomer that contains no TDI or MOCA. The material when cured has outstanding physical properties. Exhibiting high tensile and tear strength along with exceptional abrasion resistance. It is insensitive to typical environmental moisture and exhibits low shrinkage. The product is reddish/brown in color.

Application and Mix Ratio

Condition the liquid components: Component A to 90˚F-100°F to reduce viscosity which greatly aids with mixing and Component B to 72°F before combining. Warmer temperature will significantly shorten the working time and colder temperatures will length time and make mixing difficult.

In a clean plastic container, mix by Weight 100 parts of Component A (clear) and 13 parts Component B (clear or clear amber) or mix by Volume 100 parts Component A and 14 part Component B.

Start mixing immediately after A & B components are added to the beaker. Use a clean flat spatula taking care to scrape the sides and bottom of the container to include all of the unmixed material.

Mix for 1 minute, mixture should be evenly mixed with no "lines" of unmixed clear or black.
Pour mixture into prepared mold. Cami 980 silicone mold release is recommended for most surfaces.

Clean up with mineral spirits.

Metallic surfaces to be bonded should be brushed blasted to achieve a 2 to 3-mill surface profile to remove all surface oxidation and traces of previously bonded polymer. After blasting, etched surface should be thoroughly degreased using clean Toluene or mineral spirits solvent wipe. Surface is now ready for priming.

To prevent further surface oxidation, prepared metallic surface should be immediately primed using Primer 460SPX or Primer 800 and allowed to cure in a dry environment overnight for 12 hours.  This should be allowed to cure for 1 hour at 72°F before applying PureCast 605 urethane elastomer (see Primer 460SPX or Primer 800 technical data sheet for full mixing and application instructions).

Do not allow Primer 460 SPX or Primer 800 to cure longer than 6 hours before applying PureCast 605 urethane elastomer to ensure a total chemical bond in between primer and elastomer coating.

Maintain at least 72°F during the complete application process. Colder temperatures retard curing times, warmer temperatures reduce curing times.

All primed surfaces should be kept free of moisture, dust and any grease or oil, which may interfere with polymer bond.


Working Properties

Mix Ratio By Weight

100 parts A/ 13 part B

Mix Ratio By Volume

100 parts A/ 14 parts B

Viscosity @ 72°F (A Side)

7,000 CPS

Viscosity @ 72°F (B Side)

100 CPS

Viscosity @ 72°F (Mixed)

4000 CPS


Part A:



Part B:

Clear to Clear Amber



Clear to Clear Amber

Working Life @ 72°F

15-25 minutes

Demold Time* @72°F

8-10 hours

Demold Time* @150°F

1-2 hours

Complete Cure Time* @ 72°F

7 days

* Set time and Demold time depends on temperature and relative humidity.


Physical Properties

Specific Gravity (Part A)


Specific Gravity (Part B)


Specific Gravity (Mixed)


Weight/Gallon Part A

8.59 lbs.

Weight/Gallon Part B

8.50 lbs.

Weight/Gallon Mixed

8.59 lbs.

Hardness @ 72° F

ASTM 2240-85

50-60 Shore D

Tear Strength

ASTM D-624 die C

1221 lb./in.

Tensile Strength

ASTM D-412 die C

6284 psi


ASTM D-412 die C



Clean Up

Dispose of all empty PureCast 605 component containers in accordance with local, state and federal regulations. Empty component containers can be rendered non-hazardous by rinsing the containers with a small amount of mixed material and allowing the solvents to evaporate. The containers will then contain non-hazardous cured urethane.

Storage and Shelf Life

PureCast 605 is shipped from the factory in sealed containers. The containers should be stored in a cool, dry area that is protected from direct sunlight and moisture. Storage temperatures should not exceed 80°F. The shelf life of the factory sealed containers stored under these conditions is six months. Containers that have been opened should be resealed immediately after material has been removed in order to prevent solvent evaporation.


Shipping Class: Class 55 Non-hazardous