VFI-176 80 A Polyurethane Casting Rubber

VFI-176 80 A Polyurethane Casting Rubber is a fast-setting urethane rubber with good rebound properties. The urethane’s viscosity allows for easy processing when pouring or injecting and the creation of larger castings that maintain final properties. VFI-176 has excellent physical properties and cures at room temperature with no post-curing necessary. With a higher amine content, the rubber provides good chemical resistance, durability, and low-temperature flexibility for longer use of a mold or part. The material’s fast setting capabilities allow for a quick demold time that increases part production.

Physical Properties	Test Method	Test Results
Hardness Shore A	ASTM D2240	81 A
Tensile Strength	ASTM D412	1,021 psi
Elongation	ASTM D412	405%
Tear Strength	ASTM D624	252 pli
Yield Strength	N/A	302 psi
Elastic Modulus	N/A	2,118 psi
Solid Material Density	N/A	67.21 pcf
Permanent Set	N/A	15%
Shrinkage	N/A	0.50%

Physical Properties

Test Method

Test Results

Hardness Shore A

ASTM D2240

81 A

Tensile Strength

ASTM D412

1,021 psi

Elongation

ASTM D412

405%

Tear Strength

ASTM D624

252 pli

Yield Strength

N/A

302 psi

Elastic Modulus

N/A

2,118 psi

Solid Material Density

N/A

67.21 pcf

Permanent Set

N/A

15%

Shrinkage

N/A

0.50%

Liquid Properties	Test Method	Test Results
Solids by Weight	ASTM D1644	100%
Solids by Volume	ASTM D2697	100%
Mixed Liquid Density	ASTM D2939	8.91 lbs/gal
Specific Gravity A Side	N/A	1.086 g/mL
Specific Gravity B side	N/A	1.067 g/mL
Mixed Specific Gravity	N/A	1.07 g/mL
Ratio by Volume (A:B)	N/A	1A:1B
Ratio by Weight (A:B)	N/A	100A:98.13B
Viscosity A Side	ASTM D2196	1,200 cps
Viscosity B Side	ASTM D2196	1,300 cps
Pot Life	N/A	4 minutes
Demold Time	N/A	20 minutes
Full Cure	N/A	10 days
VOC	N/A	0

Liquid Properties

Test Method

Test Results

Solids by Weight

ASTM D1644

100%

Solids by Volume

ASTM D2697

100%

Mixed Liquid Density

ASTM D2939

8.91 lbs/gal

Specific Gravity A Side

N/A

1.086 g/mL

Specific Gravity B side

N/A

1.067 g/mL

Mixed Specific Gravity

N/A

1.07 g/mL

Ratio by Volume (A:B)

N/A

1A:1B

Ratio by Weight (A:B)

N/A

100A:98.13B

Viscosity A Side

ASTM D2196

1,200 cps

Viscosity B Side

ASTM D2196

1,300 cps

Pot Life

N/A

4 minutes

Demold Time

N/A

20 minutes

Full Cure

N/A

10 days

VOC

N/A

Thickness Requirements

There is no limit to thickness when using VFI-176, but if you are pouring or injecting less than 1/16^th of an inch thick, you will have to post-cure the material. Pour the material in a single spot at the lowest point of the mold when casting by hand.

Storage/Shelf Life

Store between 60°F – 90°F in a clean, dry building. The shelf life of unopened containers is 12 months after the date of manufacture. Once open, use immediately, but if storing after opening, both sides must be nitrogen purged.

Mold Preparation

All surfaces must be clean and free of dirt, debris, and oils that could contaminate the material. When demolding, the surface must be sealed with a release agent. A release agent will help extend the life of the mold and prevent unwanted adhesion. Compatible molds for casting include urethane and metal when properly prepared. The material can be used with platinum silicone molds but will create a surface tack, so it must be removed from the silicone mold and post-cured. You may heat the mold between 70°F-150°F to accelerate the cure process and achieve a quicker demold. However, heating the mold will shorten the pot life.

Mixing

Before combining the A (Iso) and B (Poly) side materials, the B side should be premixed until uniform. With a short work time, the main method of application is using injection equipment, but VFI-176 can also be hand poured. If pouring by hand, pre-weigh the material into separate containers and pour the B side into the A side. You can mix small volumes of the material by hand, but any quantities over ½ a gallon should be rapidly mixed with a power mixer until uniform. Transfer the material into a new container and mix again until uniform. The material must be fully mixed and used before the duration of the pot life. The pot life will shorten if the temperature exceeds 72°F.

Post-cure

The material should be allowed to cure for at least 20 minutes at room temperature before demolding. Thinner pours will need more time to cure to develop the necessary green strength to demold. VFI-176 will reach full physical properties after 10 days. To achieve final properties faster, the material can be post cured in an oven at 150°F for 16 hours. Silicone molds must be post-cured at room temperature for one day or at 150°F in an oven for 2 hours to remove surface tack.

Precautions

VFI-176 contains isocyanate, which is irritating to the skin and toxic if inhaled. Avoid prolonged breathing of vapors and repeated skin contact. Use only with adequate ventilation. The material is not UV color stable and has no long-term UV testing. It is sensitive to moisture and cannot be cross mixed with other materials. Do not thin or add foreign material to the product. See Safety Data Sheet for complete safety instructions.