VFI®-4176 75 D Casting Plastic

VFI-4176 75 D Casting Plastic is a hard, 100% solids, polyurethane plastic with a convenient 1A:1B mix ratio by weight and high tensile strength. A longer pot life provides ample time to pour and process the material, which is great when pouring larger castings. The slow cure allows for pours at least ¼” thick. This material is highly functional and easily machined with CNC or woodworking equipment. VFI-4176 is made to be poured and cured at room temperature for easier processing.

Physical Properties	Test Method	Test Results
Shore Hardness	ASTM D2240	75 D
Tensile Strength	ASTM D638	5,130 psi
Tensile Modulus	ASTM D638	223,000 psi
Elongation at Break	ASTM D638	11%
Flexural Modulus	ASTM D790	237,000 psi
Izod Impact, Notched	ASTM D256	55 ft-lb/in
Linear Shrinkage	ASTM D2566	<0.0005 in/in
Heat Deflection Temperature (@ 66 psi)	ASTM D648-18	N/A
Flame Test	UL 94-V0	No
Standard Cured Color	N/A	White

Physical Properties

Test Method

Test Results

Shore Hardness

ASTM D2240

75 D

Tensile Strength

ASTM D638

5,130 psi

Tensile Modulus

ASTM D638

223,000 psi

Elongation at Break

ASTM D638

11%

Flexural Modulus

ASTM D790

237,000 psi

Izod Impact, Notched

ASTM D256

55 ft-lb/in

Linear Shrinkage

ASTM D2566

<0.0005 in/in

Heat Deflection Temperature (@ 66 psi)

ASTM D648-18

N/A

Flame Test

UL 94-V0

Standard Cured Color

N/A

White

Liquid Properties	Test Method	Test Results
Mix Ratio by Volume	N/A	88.4A:100B
Mix Ratio by Weight	N/A	1A:1B
Weight per Gallon A Side	ASTM D1475	9.59 lb/gal
Weight per Gallon B Side	ASTM D1475	8.3 lb/gal
Mixed Weight per Gallon	ASTM D1475	9 lb/gal
Viscosity A Side	ASTM D2196	128 cps
Viscosity B Side	ASTM D2196	150 cps
Mixed Viscosity	ASTM D2196	N/A
Pot Life	N/A	10 minutes
Gel Time	N/A	12 minutes
Demold Time	N/A	N/A
Full Cure Time	N/A	7 days

Liquid Properties

Test Method

Test Results

Mix Ratio by Volume

N/A

88.4A:100B

Mix Ratio by Weight

N/A

1A:1B

Weight per Gallon A Side

ASTM D1475

9.59 lb/gal

Weight per Gallon B Side

ASTM D1475

8.3 lb/gal

Mixed Weight per Gallon

ASTM D1475

9 lb/gal

Viscosity A Side

ASTM D2196

128 cps

Viscosity B Side

ASTM D2196

150 cps

Mixed Viscosity

ASTM D2196

N/A

Pot Life

N/A

10 minutes

Gel Time

N/A

12 minutes

Demold Time

N/A

Full Cure Time

N/A

7 days

Thickness Requirements

We recommend pouring VFI-4176 at a minimum thickness of ¼”. Anything thinner than ¼” will require post-curing at 150°F for a minimum of 2 hours.

Mold Preparation

Release agents are recommended for any molding application to extend the life of the mold. A release agent is required when using a prototyping urethane mold. Heated molds are not recommended for this product or any mold over 120°F. Do not use a two-part closed mold.

Mixing

The B side (Poly) must be premixed once daily before each use, being careful not to introduce extra moisture or air. The A side (Iso) does not need to be mixed.

Prepare a container that is an appropriate size for degassing. It is recommended to contain at least 2/3 of headspace in order to vacuum degas. Depending on volume, vacuum degassing may not be required. Pour measured A side into the container and promptly follow by pouring measured B side into the same container. Mix until by hand or power mixer. Mixing, vacuum degassing, and pouring must all be completed before the end of the pot life.

Post-Cure

VFI-4176 does not require post-curing unless it is poured at less than ¼”. If pouring thinner than ¼”, it must be post-cured at 150°F for a minimum of 2 hours. Regardless of thickness, it will reach full properties within 7 days of curing.

Storage/Shelf Life

The shelf life is 6 months for the A side (Iso) and 1 year for the B side (Poly) from the date of manufacture. Store in a clean, dry environment between 60°F – 90°F.

Precautions

This product contains isocyanate, which may irritate the skin and is toxic if inhaled as particulate matter. VFI-4176 can be harmful if swallowed and cause eye irritation, allergies, or asthma symptoms. Seek medical attention if exposed or concerned. Avoid prolonged breathing of vapors or repeated skin contact. Wear PPE including gloves, eye, and face protection. Use only with adequate ventilation. Do not add foreign material to the product. See the Safety Data Sheet for complete safety information.