VFI-425 High Pressure Foundation Spray Coating

VFI-425 High Pressure Foundation Spray Coating is a fast setting, 100% solids polyurea hybrid with excellent tensile strength. When applied before backfilling, the coating creates a seamless, long-lasting barrier that waterproofs commercial and residential foundations. The membrane’s low permeability prevents water from penetrating into the foundation walls. As a polyurea hybrid, it has excellent chemical resistance and will not degrade underground. VFI-425 is an exterior defense for the foundation and provides the durability required to lengthen the life of the structure.

Physical Properties	Test Method	Test Results
Hardness Shore D	ASTM D2240	57 D
Tensile Strength	ASTM D412	2,410 psi
Elongation	ASTM D412	80%
Tear Strength	ASTM D624	241 pli
Solid Material Density	N/A	65.75 pcf
Elastic Modulus	N/A	12,987 psi
Yield Strength	N/A	1,464 psi
Permanent Set	N/A	2%
Cold Temperature Flexibility	N/A	Pass
Adhesion Strength Prepared Steel/Prepared Concrete	N/A	675/825 lbs/in2

Physical Properties

Test Method

Test Results

Hardness Shore D

ASTM D2240

57 D

Tensile Strength

ASTM D412

2,410 psi

Elongation

ASTM D412

80%

Tear Strength

ASTM D624

241 pli

Solid Material Density

N/A

65.75 pcf

Elastic Modulus

N/A

12,987 psi

Yield Strength

N/A

1,464 psi

Permanent Set

N/A

Cold Temperature Flexibility

N/A

Pass

Adhesion Strength Prepared Steel/Prepared Concrete

N/A

675/825 lbs/in2

Liquid Properties	Test Method	Test Results
Solids by Volume	ASTM D2697	100%
Liquid Density A Side	ASTM D2939	9.38 lbs/gal
Liquid Density B Side	ASTM D2939	8.26 lbs/gal
Mixed Liquid Density	ASTM D2939	8.83 lbs/gal
Ratio by Volume (A:B)	N/A	1A:1B
Viscosity A Side	ASTM D2196	900 cps
Viscosity B Side	ASTM D2196	800 cps
Gel Time	N/A	4 seconds
Tack Free	N/A	28 seconds
Recoat Time	N/A	2 hours
Place Into Service	N/A	light 4 hours \| full 24 hours
Full Cure	N/A	5 days
VOC	N/A	0

Liquid Properties

Test Method

Test Results

Solids by Volume

ASTM D2697

100%

Liquid Density A Side

ASTM D2939

9.38 lbs/gal

Liquid Density B Side

ASTM D2939

8.26 lbs/gal

Mixed Liquid Density

ASTM D2939

8.83 lbs/gal

Ratio by Volume (A:B)

N/A

1A:1B

Viscosity A Side

ASTM D2196

900 cps

Viscosity B Side

ASTM D2196

800 cps

Gel Time

N/A

4 seconds

Tack Free

N/A

28 seconds

Recoat Time

N/A

2 hours

Place Into Service

N/A

light 4 hours | full 24 hours

Full Cure

N/A

5 days

VOC

N/A

Equipment

Use a high-pressure, heated plural component spray rig capable of 2,300-2,500 psi and temperatures between 130°F – 150°F to apply the coating.

Surface Preparation

Clean all surfaces so they are free of contaminants such as oils, dirt, and films that could affect the coating’s adhesion. Loose particles can be brushed off or washed off with a power washer. Protrusions must be removed, and existing holes, cracks, or chips should be repaired. To achieve an acceptable surface for coating, you can sandblast or shot-blast smooth or contaminated concrete. New concrete must be dry and should be aged at least 28 days. VFI recommends using a primer to seal porous surfaces.

Mixing

Before using VFI-425, bring the material to a minimum temperature of 65°F. The B side (Poly) must be premixed until uniform before spraying. The time it takes to mix will depend on volume and mixing method.

Application Requirements

Both A and B side materials must be brought to a minimum temperature of 65°F before spraying. The target surface temperature should be between 40°F – 100°F during application. VFI requires an application of at least 40 mils to get the proper permeance. If additional coats are needed, they must be applied within the 2-hour recoat window. A foundation can be coated and backfilled the same day for a quick return to service.

Cleanup

VFI’s preferred cleaning solvent is xylene or MEK. When flushing spray lines, we recommend the VFI-8005 Pump Flush to remove the material from the hoses.

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, it should be used immediately. If you are storing after opening, the container must be nitrogen purged.

Precautions

VFI-425 contains isocyanate, which is irritating to the skin and toxic if inhaled as particulate matter. Avoid prolonged breathing of vapors and repeated skin contact. The product is UV resistant but will fade over time. Do not add foreign material to the product. Use only with adequate ventilation. See Safety Data Sheet for complete safety information.