UraGel 770 consists of two thin liquids, Component A and Component B. After mixing, UraGel 770 immediately thickens to a buttery non-sag paste, which forms a high strength rigid bond. UraGel 770 is especially well suited for forming rigid parts and molds. When fully cured, UraGel 770 forms a rigid “fiberglass like” polymer that is easily sanded or machined into final form. UraGel 770 can also be used as a rigid mother mold back up for flexible molding compounds. UraGel 770 can be used with expanded polystyrene foam as an adhesive or “hard” coating. The thixotropic (self-thickening) nature of UraGel 770 allows for easy application to difficult overhead and vertical surfaces. UraGel 770 contains no solvents or fumes thereby avoiding fire and worker health hazards in contained work environments.

Application and Mix Ratio

Condition liquids to 72°F, remove container lids and stir carefully stir component A and component B separately. Carefully measure out equal parts of component A and component B in separate container. Do not mix more than one quart of finished material per batch. To insure proper mixing and adequate working time. Pour all of component B into component A and mix by hand with flat spatula. Carefully scrape sides down and bottom of container to insure all of both components are included in the mixture. Mixture will change color to a lighter green and thicken to a creamy paste and become slightly warm to touch. Apply thickened mixture to surface.

All surfaces to be coated with Uragel 770 should be coated with silicone mold release “Parfilm” (available through Industrial Polymers) to prevent unwanted bonding. Parts to be coated must be absolutely dry. Fabric or chopped fiber can be used to enhance the physical properties of the cured material. Application and curing of finished parts should be done in a dry environment to prevent any unwanted surfacing bubbling. All parts are fully cured in 24 hours @ 72° F before removing clamps and trimming access adhesive. Elevated temperatures will accelerate cure time, and cooler temperature will slow down curing.

Properties

Working Properties

Mix Ratio By Weight

100 parts A/ 88.27 part B

Mix Ratio By Volume

100 parts A/ 100 parts B

Viscosity @ 72°F (Component A)

450 cps

Viscosity @ 72°F (Component B)

600 cps

Viscosity @ 72°F (Mixed)

500,000 cps

Color

Part A:

Black

Color

Part B:

White

Color

Mixed:

Gray

Working Life @ 72°F

10-20 minutes

Full Cure Time* @ 72°F

24 hours

*Full Cure time depends on temperature and relative humidity.

 

Physical Properties

Specific Gravity: (Part A)

1.22

Specific Gravity: (Part B)

1.07

Specific Gravity: (Mixed)

1.15

Weight/Gallon Part A

10.16 lbs.

Weight/Gallon Part B

8.96 lbs.

Weight/Gallon Mixed

9.56 lbs.

Cubic inch per lb. of product

24.16 in3

Hardness @ 72° F

ASTM 2240-85

75-85 Shore D

Tear Strength

ASTM D-624

900 lb/in

Tensile Strength

ASTM D-412 die C

3500 psi

Elongation

ASTM D-412 die C

3%

Solids content

100%

 

Clean Up

Dispose of all empty UraGel 770 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 material to cure for 24 hours. The containers will then contain non-hazardous cured urethane.

Storage and Shelf Life

UraGel 770 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 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

Shipping Class: Class 55 Non-hazardous