EC-2500 is a low durometer, polyurethane encapsulate specifically formulated to create a soft polymer that is especially well suited for encapsulating electrical components, absorbing impact and resisting water infiltration.


  • Low Density
  • UV stable
  • Convenient mix ratio
  • Excellent long term resistance to water

Application and Mix Ratio

Carefully measure out Component A (100 parts) to Component B (91 parts) by Weight or 1:1 by Volume. Use a flat metal spatula and mix for 1 to 2 minutes then pour into another clean container and mix again. Then pour into prepared mold.


Working Properties

Mix Ratio By Weight

100 parts A/ 91 part B

Mix Ratio By Volume

100 parts A/ 100 parts B

Viscosity @ 72°F (A Side)

389 CPS

Viscosity @ 72°F (B Side)

5,698 CPS

Viscosity @ 72°F (Mixed)

1,579 CPS


Part A:

Translucent Yellow


Part B:





Working Life @ 72°F

60 minutes

Full Cure @ 72°F

2-3 days



Physical Properties

Specific Gravity (Part A)


Specific Gravity (Part B)


Specific Gravity (Mixed)


Weight/Gallon Part A

8.37 lbs.

Weight/Gallon Part B

7.61 lbs.

Weight/Gallon Mixed

7.99 lbs.

Cubic inch per lb. of product

28.88 in3

Hardness @ 72°F

 ASTM 2240

20-30 Shore A

Tensile Strength

ASTM 412 Die-C 

68 PSI


ASTM 412 Die-C


Tear Strength

ASTM D-624

51 lb./in.

Dielectric Strength

 ASTM D-149

1017.5 V/mil

Dielectric Constant

ASTM D-150 4.76


Clean Up

Clean up with Mineral Spirits or Toluene.

Dispose of all empty EC-2500 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

EC-2500 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 (6) months.


Shipping Class: Class 55 Non-hazardous