VFI-145 95 A Polyurethane Casting Rubber

VFI-145 95 A Polyurethane Casting Rubber is a fast setting, 1:1, hard rubber with good durability and rebound properties. It is capable of being a hand pour material when making smaller parts or for use in an injection system. The material’s fast setting capabilities allow for a quick demold time that increases part production. It provides excellent physical properties, such as good chemical resistance and low-temperature flexibility for increased use through multiple cycles. VFI-145 has a workable viscosity, which allows for increased part sizes that maintain final physical properties. This tough rubber has been used in a variety of applications like mold and model making, prototyping, and industrial part making.

Physical Properties	Test Method	Test Results
Hardness Shore A	ASTM D2240	95 A
Hardness Shore D	ASTM D2240	55 D
Tensile Strength	ASTM D638	2,500 psi
Elongation	ASTM D412	300%
Tear Strength	ASTM D624	300 pli
Dimensional Stability	ASTM D1204	0.75%
Impact Test Results
1/8" Film No Backing	@ 0°F	12 psi
1/2" Film No Backing	@ 0°F	>28 psi

Physical Properties

Test Method

Test Results

Hardness Shore A

ASTM D2240

95 A

Hardness Shore D

ASTM D2240

55 D

Tensile Strength

ASTM D638

2,500 psi

Elongation

ASTM D412

300%

Tear Strength

ASTM D624

300 pli

Dimensional Stability

ASTM D1204

0.75%

Impact Test Results

1/8" Film No Backing

@ 0°F

12 psi

1/2" Film No Backing

@ 0°F

>28 psi

Liquid Properties	Test Method	Test Results
Mixed Solids by Volume	ASTM D2697	100%
Mixed Liquid Density	ASTM D2939	9.16 lbs/gal
Specific Gravity A Side	N/A	1.1 g/mL
Specific Gravity B Side	N/A	1.1 g/mL
Specific Gravity Mixed	N/A	1.1 g/mL
Ratio by Volume (A:B)	N/A	1A:1B
Ratio by Weight (A:B)	N/A	100A:100B
Viscosity A Side	ASTM D2196	1,000 cps
Viscosity B Side	ASTM D2196	1,750 cps
Pot Life	N/A	1.5 minutes
Gel Time	N/A	2 minutes
Demold Time	N/A	15 minutes
Full Cure	N/A	3 days
VOC	N/A	0

Liquid Properties

Test Method

Test Results

Mixed Solids by Volume

ASTM D2697

100%

Mixed Liquid Density

ASTM D2939

9.16 lbs/gal

Specific Gravity A Side

N/A

1.1 g/mL

Specific Gravity B Side

N/A

1.1 g/mL

Specific Gravity Mixed

N/A

1.1 g/mL

Ratio by Volume (A:B)

N/A

1A:1B

Ratio by Weight (A:B)

N/A

100A:100B

Viscosity A Side

ASTM D2196

1,000 cps

Viscosity B Side

ASTM D2196

1,750 cps

Pot Life

N/A

1.5 minutes

Gel Time

N/A

2 minutes

Demold Time

N/A

15 minutes

Full Cure

N/A

3 days

VOC

N/A

Thickness Requirements

If you are pouring or injecting over 5 pounds of material, a different material that has a longer working time should be used. When casting, pour the material in a single spot at the lowest point of the mold.

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

Ensure all molding equipment and surfaces are clean and free of oils, dirt, or debris. The mold should be properly sealed and released to prevent unwanted adhesion when demolding. Using a release agent is required to help extend the life of the mold. Heating the mold between 70°F-150°F before use can accelerate the curing process, decreasing the demold time. Heating will also decrease the pot life. Compatible molds include urethane, metal, and platinum silicone when properly prepared.

Mixing

The B side (Poly) must be slowly premixed to minimize air entrapment. Small volumes can be hand-mixed, but larger quantities should be mixed with a power mixer or injection equipment. Once measured into containers, pour the B side material into the A side (Iso) material, and mix until uniform. Scrape the bottom and sides of the container while mixing. Transfer to a new container to 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. Mix times may vary depending on volume and mixing method.

Post-cure

Leave the material to cure for at least 15 minutes at room temperature before demolding. Full physical properties occur after 3 days at room temperature, but they can be achieved faster if the material is post-cured at 150°F for a minimum of 2 hours. Post-curing is recommended at thinner pours.

Precautions

VFI-145 is sensitive to moisture and contains isocyanate, which may irritate the skin and is toxic if inhaled as particulate matter. Avoid prolonged breathing of vapors or repeated skin contact. Use only with adequate ventilation. Do not thin or add foreign material to the product. See Safety Data Sheet for complete safety instructions.