VFI-4286 85 D Polyurethane Casting Plastic

VFI-4286 85 D Polyurethane Casting Plastic is a high-impact urethane plastic with high heat deflection and tensile strength. This material works well when vacuum-degassed and pressure-potted to provide a repeatable, uniform, void-free cast. It is a multi-faceted plastic capable of being used in rapid prototyping, production parts, and equipment housings for large part runs. VFI-4286 has a working time of 6 minutes. It is capable of passing UL 94 V-0 and can be used to make high-end, fire-retardant plastic parts for a variety of industries, including medical, automotive, and aerospace.

Physical Properties	Test Method	Test Results
Hardness Shore D	ASTM D2240	85 D
Tensile Strength	ASTM D638	10,500 psi
Tensile Modulus	ASTM D638	383,000 psi
Elongation	ASTM D412	13%
Flexural Strength	ASTM D790	16,000 psi
Flexural Modulus	ASTM D790	392,000 psi
Shrinkage Linear (12"x1/2"x1/2")	ASTM D2566	<0.0100 in/in
Izod Impact, Notched	ASTM D256	2ft-lb/in
Heat Deflection Temperature (@ 66 psi)	ASTM D648	205°F

Physical Properties

Test Method

Test Results

Hardness Shore D

ASTM D2240

85 D

Tensile Strength

ASTM D638

10,500 psi

Tensile Modulus

ASTM D638

383,000 psi

Elongation

ASTM D412

13%

Flexural Strength

ASTM D790

16,000 psi

Flexural Modulus

ASTM D790

392,000 psi

Shrinkage Linear (12"x1/2"x1/2")

ASTM D2566

<0.0100 in/in

Izod Impact, Notched

ASTM D256

2ft-lb/in

Heat Deflection Temperature (@ 66 psi)

ASTM D648

205°F

Liquid Properties	Test Method	Test Results
Specific Gravity A Side	ASTM D1475	1.22 g/mL
Specific Gravity B Side	ASTM D1475	1.08 g/mL
Mixed Specific Gravity	ASTM D1475	1.17 g/mL
Liquid Density A Side	ASTM D2939	10.13 lbs/gal
Liquid Density B Side	ASTM D2939	8.98 lbs/gal
Ratio by Volume (A:B)	N/A	177.26A:100B
Ratio by Weight (A:B)	N/A	2A:1B
Viscosity A Side (cps @ 77°F)	ASTM D2196	120 cps
Viscosity B Side (cps @ 77°F)	ASTM D2196	800 cps
Mixed Viscosity (cps @ 77°F)	N/A	500 cps
Pot Life (150 g mass @ 77°F)	N/A	6 minutes
Gel Time (150g mass @ 77°F)	N/A	7 minutes
Demold	N/A	2 hours

Thickness Requirements

To create the necessary exotherm to fully cure the part, it cannot be poured less than a quarter inch thick at room temperature. If thinner pours are needed, you must elevate the mold and molding temperature to 115°F.

Mold Preparation

Using release agents is recommended for any molding application to extend the life of the mold, and for prototyping urethane molds, it is a requirement. Heated molds or any mold over 120°F are not recommended because it will cause an uneven cure.

Mixing

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

Prepare a container that is an appropriate size with at least 2/3 of head space for vacuum degassing. Pour the measured A side into the container, and promptly follow by pouring the measured B side into the same container. Mix the material until uniform by hand or power mixer. Mixing, vacuum degassing, and pouring must all be completed before the end of the pot life.

Post-Cure

After an initial cure at room temperature for 16 hours, a heat cure at 150°F for 24 hours is recommended to achieve full physical properties. Physical properties at room temperature will be delayed until after 7 days and may not fully develop without post-curing in an oven.

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 opened, use it immediately. If storing after opening, both sides must be nitrogen purged immediately after use.

Precautions

This product 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 add foreign material to the product. See Safety Data Sheet for complete safety information.