VFI-4172 75 D Slow Casting Plastic

VFI-4172 75 D Slow Casting Plastic is a hard, 100% solids, polyurethane plastic with a convenient 1:1 mix ratio by volume and high tensile strength. A longer pot life provides you with ample time to pour and process the material, which is great when pouring larger castings. The slow cure allows for pours at least ½” thick. This material is highly functional and easily machined with CNC or woodworking equipment. VFI-4172 is made to be poured and cured at room temperature for easier processing.

Physical Properties	Test Method	Test Results
Hardness Shore D	ASTM D2240	75 D ± 2
Tensile Strength	ASTM D638	5000 psi
Tensile Modulus	ASTM D638	N/A
Elongation	ASTM D638	14%
Flexural Modulus	ASTM D790	221,000 psi
Yield Stress	ASTM D790	N/A
Shrinkage Linear	12"x0.5"x0.5"	<0.005 in/in

Physical Properties

Test Method

Test Results

Hardness Shore D

ASTM D2240

75 D ± 2

Tensile Strength

ASTM D638

5000 psi

Tensile Modulus

ASTM D638

N/A

Elongation

ASTM D638

14%

Flexural Modulus

ASTM D790

221,000 psi

Yield Stress

ASTM D790

N/A

Shrinkage Linear

12"x0.5"x0.5"

<0.005 in/in

Liquid Properties	Test Method	Test Results
Mixed Solids by Volume	ASTM D2697	100%
Liquid Density A Side	ASTM D2939	9.59 lbs/gal
Liquid Density B Side	ASTM D2939	9.59 lbs/gal
Mixed Liquid Density	ASTM D2939	9.00 lbs/gal
Specific Gravity A Side	N/A	1.15 g/mL
Specific Gravity B Side	N/A	1.02 g/mL
Mixed Specific Gravity	N/A	1.08 g/mL
Ratio by Volume (A:B)	N/A	88.40A:100B
Ratio by Weight (A:B)	N/A	1A:1B
Pot Life	N/A	15 minutes
Gel Time	N/A	18 minutes
Flash Point	ASTM D56	>200°F
VOC	N/A	0

Thickness Requirements

We recommend pouring VFI-4172 at a minimum thickness of 1/2”. Anything thinner than 1/2” will require post-curing at 150°F for a minimum of 2 hours.

Storage/Shelf Life

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

Mold Preparation

Using a release agent is recommended for any molding application to extend the life of the mold, and for prototyping urethane molds, it is a requirement. 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.

If vacuum degassing, prepare an appropriately sized container with at least 2/3 of headspace. Pour measured A side into the container and promptly follow by pouring measured B side into the same container. Mix until uniform by hand or power mixer. Mixing, degassing, and pouring must all be completed before the end of the pot life.

Post Cure

VFI-4172 does not require post-curing unless it is poured at less than 1/2”. If pouring thinner than 1/2 of an inch, 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.

Precautions

This product contains isocyanate, which may irritate the skin and is toxic if inhaled as particulate matter. VFI-4172 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 Safety Data Sheet for complete safety information.