Primer 302

1. Resistance to Condensation:*
Test panels were placed in the QCT Condensation Cabinet and maintained at a temperature of 120°F (49°C) and 100'% relative humidity. PRIMER 302 LV had no loss of adhesion, no blistering or softening, and no corrosion was observed beneath the film. Visual observations were made within 30 minutes after test panels were removed from the test chamber and again after 24 hours following the test. Tested in accordance with ASTM D2247.

2. Adhesion:*
Test panels primed with PRIMER 302 LV were cross-cut, forming a grid area of 100 squares. Tape was then firmly placed across the center of the grid. After the tape was removed, the grid area was inspected for adhesion of the primer to the substrate under magnification. The results were 100% adhesion, meeting the
requirements for a 5 B Classification as defined in the ASTM Standard. The edges of the cuts were completely smooth and none of the squares of the grid were detached. Tested in accordance withASTMD3359.

3. Resistance to Salt Spray:*
Test panels were placed in the Harshaw Salt Spray Cabinet and maintained at a temperature of 95°F (35°C), utilizing a sodium chloride fog solution of not less than 5% by weight. Test panels were "X" scribed to initiate
corrosion before being placed into the test chamber. After 1,000 hours of continuous testing, PRIMER 302 LV had no loss of adhesion, no blistering or softening, and no corrosion was observed beneath the film.
Corrosion was observed on "X" cut. Visual observations were made immediately after test panels were removed from the test chamber. Tested in accordance with ASTM B117.

4. Flexibility:*
PRIMER 302 LV retains its ability to withstand multiple 7/16" (1.11 cm) mandrel bends without cracking. Observations were made under 10 times magnification. Tested in accordance with Federal Test Method
Standard No. 141 a-6221.

5. Resistance to Impact:**
Gardner Impact Tester – PRIMER 302 LV did not shatter, crack or chip when struck by a direct impact of 60 inch pounds. Tested in accordance with Federal Test Method Standard No. 141 a-6226.

6. Bond Strength:
PRIMER 302 LV was applied over steel test panels to a minimum thickness of 1.5 dry mils (38 dry microns). Steel panels were sandblasted to Near-White (SP10) prior to being primed. UNITEDS Elastuff 504 was
then applied over the primed test panels to a minimum thickness of 38 dry mils (965 dry microns). After test panels were allowed to fully cure, the bond (peel) strength was tested using the Instron Universal Testing
Instrument. Elastuff 504 reached its maximum elongation point and pulled parts of PRIMER 302 LV from the steel panels. The bond between the primer and the substrate proved to be outstanding. The peel strength of PRIMER 302 LV exceeded 75 lbs. per lineal inch (13.13 kN/m). Tested in accordance with ASTM D903.

7. Cathodic Disbondment:
Successful coatings for steel pipe subjected to negative voltage for corrosive resistance must pass rigid cathodic disbondment criteria as outlined in ASTM Standard G8. PRIMER 302 LV surpasses the most critical
requirements and effectively bonds polyurethane and polyurea elastomers to steel pipe subjected to varying degrees of negative voltage.

8. Low & High Temperature Applications:
PRIMER 302 LV may be applied at temperatures as low as 32°F (0°C) and at surface temperatures as high as 120°F (49°C). For applications below 32°F (0°C), consult UNITED'S Technical Service Department

9. Fast Cure Time:
PRIMER 302 LV dries in under 3 hours at 75°F (24°C), 50% R.H. This allows topcoating on the same day, thus maximizing work efficiency. Dry time can be reduced by reducing with a “fast” solvent, such as MEK.