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3M
Scotchkote™ 323/323i
Liquid Epoxy Coatings for Corrosion Protection
Product Description
3M™ Scotchkote 323/323i Liquid Epoxy
Coatings are two-part systems designed to protect steel pipe and other
metal surfaces from the harsh affects of corrosion.
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.
- Certified to ANSI/NSF Standard 61,
Drinking Water System Components.
 Chemical
Resistance
Scotchkote 323/323i are 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:
- Remove oil, grease and loosely adhering
deposits.
- Abrasive blast clean the surface to NACE
No. 2/SSPCSP10, ISO 8501:1, Grade SA 2 1/2 near-white metal.
- Ensure the abraded surface is cleaned of
abrading debris with the use of an air blast or a clean lint free cloth.
- 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 323/323i at a minimum
thickness of 635 microns or 25 mils.
- Allow to cure.
- Visually or electrically inspect the
coating for defects.
- Repair all defects using Scotchkote
323/323i as a repair material.
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:
- Remove oil, grease and loosely adhering
deposits.
- 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.
- Ensure the abraded surface is cleaned of
abrading debris with the use of an air blast or a clean lint free cloth.
- With the metal above 41˚F/5˚C and a
minimum of 37°F / 3°C above the dew point, apply Scotchkote 323/323i at
a minimum thickness of 635 microns or 25 mils.
Scotchkote 323/323i 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 |
|
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 |
323i Viscosity @ 72°F / 22°C
Brush grade
Spray grade |
Part A: 154,000, Part B: 3,500
Part A: 90,000, Part B: 9,500 |
|
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 |
|
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
323i = 60.9 inch-lbs (6.8 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 |
323/323i Brush Grade Application Instructions
- Mix separate parts A
and B.
- Pour part B into
part A. Scotchkote 323/323i have a mix ratio of 2A
to 1B by volume.
- Thoroughly mix
combined parts into a uniform color.
Recommendations
- 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.
- A 1/4" (6 mm) nap
roller is suggested.
- 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.
- Because of the high
viscosity of this product, mix parts A & B together
at temperatures above 68°F (20°C).
- Using a brush or
roller, apply Scotchkote 323/323i to a minimum
thickness of 25 mils (635 μm) or as specified.
- Overlap the pipe
coating no less than 1" (25 mm).
- Allow coating to
properly cure before handling.
Scotchkote 323/323i
Patch Compound Applicator
Multiple Coats
Scotchkote 323/323i
have 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.
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