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Scotchkote 323 Liquid Epoxy, by 3M

Two-part system designed to protect steel pipe.

 

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Product Description

3M™ Scotchkote 323 Liquid Epoxy Coating is a two-part system designed to protect steel pipe and other metal surfaces from the harsh affects of corrosion. An ideal spray applicator is the 3M Scotchkote Spray System HSS-450.

Intended Uses

  • As a patch material.
  • As a girthweld coating.
  • As an internal lining
  • As a stand alone coating for pipe rehabilitation.
  • In a wide variety of other field applications where corrosion protection of metal is required.

Product Features

  • No solvents needed.
  • High build, up to 45 mils/1150 microns in one application
  • Applicable by cartridge, brush, roller or plural component spray.
  • Excellent adhesion.
  • 100% solids.
  • Can be applied to a substrate as cold as 41°F / 5°C.
  • Meets the requirements of AWWA C210, - 97 clause 4.3.4.1.

Brush application of 3M Scotchkote 323 liquid epoxy coatingChemical Resistance

Scotchkote 323 is resistant to damage by acids and bases in the pH range of 2 to 14. It is also resistant to hydrocarbons such as crude oil, motor oil, gasoline and many solvents. Testing is suggested if the coating is to be used in continual contact with oxidizing agents such as sodium hypochlorite (bleach) and aggressive solvents such as methyl ethyl ketone (MEK).

 

General Application Steps

For use as a joint coating, a refurbishing coating or as a pipe coating:

  1. Remove oil, grease and loosely adhering deposits.
  2. Abrasive blast clean the surface to NACE No. 2/SSPCSP10, ISO 8501:1, Grade SA 2 1/2 near-white metal.
  3. Ensure the abraded surface is cleaned of abrading debris with the use of an air blast or a clean lint free cloth.
  4. Within four hours of blasting as per the above cleaning process and with the metal above 41˚F / 5˚C and a minimum of 37°F/3˚C above the dew point, apply Scotchkote 323 at a minimum thickness of 635 microns or 25 mils.
  5. Allow to cure.
  6. Visually or electrically inspect the coating for defects.
  7. Repair all defects using Scotchkote 323 as a repair material.
  8. For use as a repair material in the field where scratches or other holidays may have occurred as a result of shipping damage, etc., and the bare area of steel substrate exposed exceeds approximately 20 mm diameter or about 0.6 sq. in. or 400 sq. mm:
  9. Remove oil, grease and loosely adhering deposits.
  10. Abrade the FBE surface with medium grit sandpaper (approximately 80 grit). Powered rotary sanders are anacceptable means to perform this task. Ensure that the surrounding FBE is roughened for 10 mm on all sides.An anchor pattern of 40 to 100 microns is preferred on the substrate.
  11. Ensure the abraded surface is cleaned of abrading debris with the use of an air blast or a clean lint free cloth.
  12. With the metal above 41˚F/5˚C and a minimum of 37°F / 3°C above the dew point, apply Scotchkote 323 at a minimum thickness of 635 microns or 25 mils.
     

Scotchkote 323 Coverage per Kit Size
              (assuming no waste)
 

Kit Pounds Coverage in Square Feet
25 mils 28 mils 30 mils
50 ml
400 ml
Quart
Gallon
5 gal x 3		 0.15
1.19
2.1
8.4
152		 0.85
6.78
11.9
47.7
866		 0.76
6.05
10.6
42.6
773		 0.71
5.65
9.9
39.7
722
 
 
Number of Quarts Needed per Weld
 
Pipe Diameter(inches) Total Length to Coat (cutbacks + overlaps)
6" / 15 cm 8" / 20 cm 10" / 25 cm 12"/ 30 cm
6
12
20
24
30
36
42
48		 0.06
0.13
0.21
0.25
0.31
0.38
0.44
0.50		 0.08
0.17
0.28
0.33
0.42
0.50
0.59
0.67		 0.10
0.21
0.35
0.42
0.52
0.63
0.73
0.84		 0.13
0.25
0.42
0.50
0.63
0.75
0.88
1.00
Properties
 
Property Value

Color

Blue-green

Mix Ratio

2A to 1B by volume, 70.8% to 29.2% by weight

323 Viscosity @ 72°F / 22°C
   Brush grade
   Spray grade

 
Part A: 154,000, Part B: 6,000
Part A: 90,000, Part B: 19,000

Shelf Life

24 months

Specific gravity

1.35 mixed

Coverage

142 sq ft / lb / mil (0.74 m2 / kg / mm)

Maximum Operating Temperature
   Wet
   Dry

 
203°F / 95°C
250°F / 121°C

Minimum Coating Thickness

25 mils / 635 microns recommended
 
Typical Test Properties
 
Property Test Description Typical Value

Shyodu Gel Time
(approximate pot life)

200 gm mass

75°F / 24°C: 18 min
104°F / 40°C: 11 min

Dry to Touch Time

ASTM D1640
clause 7.5.2

41°F / 5°C: 7 hrs
75°F / 24°C: 1 hr 45 min
122°F / 50°C: 26 min

Approximate Back Fill Time

ASTM D1640
clause 7.7.1

41°F / 5°C: 8 hrs
75°F / 24°C: 2 hrs 39 min
122°F / 50°C: 39 min

Cathodic Disbondment
(steel grit blasted plates lab
applied; results may very depending
on blast media)

CSA Z245.20-02
clause 12.8

149°F / 65°C, 3.5V, 24 hrs, 4.9 mmr
149°F / 65°C, 1.5V, 48 hrs, 5.5 mmr
149°F / 65°C, 1.5V, 28 days, 7.5 mmr
176°F / 80°C, 1.5V, 14 days, 6.4 mmr
176°F / 80°C, 1.5V, 28 days, 6.6 mmr

Adhesion of Coating

CSA Z245.20-02
clause 12.14

203°F / 95°C, 24 hrs, Rating 1
167°F / 75°C, 48 hrs, Rating 1
167°F / 75°C, 28 days, Rating 1

Flexibility

CSA Z245.20-02
clause 12.11

68°F / 20°C, 0.7, °/PD
32°F / 0°C, 0.7, °/PD

Abrasion Resistance
(wheels resurfaced every
5000 cycles)

ASTM D4060-95
CS-17 wheels
1000 g load
5000 cycles

0.325 g loss

Impact Strength

ASTM G14

323 = 73.6 inch-lbs (8.3 joules) at 75°F / 24°C

Impact Resistance

CSA Z245 20-98
clause 12.12

See chart below.
 
Impact Resistance
(Impact value is the last Joule where three impacts have passed)
 
Panel
Number		 Test
Temperature		 Joule
Value		 Holiday Detection Volts Average DFT (mils)
1
2
3
4
5
6
7
8		 -40°F / -40°C
-22°F / -30°C
14°F / -10°C
32°F / 0°C
68°F / 20°C
122°F / 50°C
149°F / 65°C
176°F / 805°C		 1.5
1.0
1.5
1.5
2.75
2.5
4.0
3.5		 2500
2500
2500
2500
2500
2500
2500
2500		 30.4
24.5
27.2
25.0
26.9
27.7
27.0
26.3

323 Brush Grade Application Instructions

  1. Mix separate parts A and B.
  2. Pour part B into part A. Scotchkote 323 has a mix ratio of 2A to 1B by volume.
  3. Thoroughly mix combined parts into a uniform color.

 

Recommendations

  1. Prepare only the quantity of coating that can be applied within the pot life:
    20 min with 200 gm mass at 75°F / 24°C, 11 min with 200 gm mass at 104°F / 40°C.
  2. A 1/4" (6 mm) nap roller is suggested.
  3. For speed of application, and to extend the working life of the product, pour mixed product directly to the top of the substrate/pipe, then pull the mixture down around pipe in one direction with brush.
  4. Because of the high viscosity of this product, mix parts A & B together at temperatures above 68°F (20°C).
  5. Using a brush or roller, apply Scotchkote 323 to a minimum thickness of 25 mils (635 μm) or as specified.
  6. Overlap the pipe coating no less than 1" (25 mm).
  7. Allow coating to properly cure before handling.

 

Scotchkote 323 Patch Compound Applicator

3M Scotchkote 323 Patch Compound Applicator

Multiple Coats

Scotchkote 323 has been formulated to achieve a coating thickness of up to 45 mils/1150 microns in one coat. If additional thickness is required, apply the additional coats within four hours of the initial coat. This coating may be applied in any thickness consistent with producing an acceptable surface finish.

Helpful Spray Information

  • Suggested tip size of 625.
  • Tip pressure approximately 2,200 psi / 15.2 MPa.
  • Preheat Part A to 150°F / 66°C.
  • Preheat Part B to 120°F / 49°C.
  • Mix ratio of pumps is 2:1.

 

Equipment Clean-Up

MEK or tolulene may be used to clean spray equipment, rollers and brushes. Utilize proper safety guidelines.