Scotchkote™ Abrasion Resistant Epoxy Coating 328, by 3M

Combining a traditional liquid epoxy with enhanced abrasion resistance, flexibility, and impact resistance, an AREC coating can be used in place of a conventional Abrasion Resistant Overcoat (ARO) or as a primary corrosion protection coating.

Description

3M™ Scotchkote™ Abrasion Resistant Epoxy Coating (AREC) 328 is a 100% solids, two-part epoxy system designed for directional drilling, rocky terrain, or other applications that require a rugged coating. Combining a traditional liquid epoxy with enhanced impact resistance, gouge resistance, and flexibility, an AREC coating can be used in place of a conventional Abrasion Resistant Overcoat (ARO). With strong adhesion to both metal and FBE, it is equally effective for use as a primary corrosion protection coating for applications which require high flexibility after cure, in which long-term adhesion is critical. Best of all, Scotchkote coating shows that abrasion resistant coatings can be easy to apply!


Features

  • Increased Gouge Resistance*
  • Increased Abrasion Resistance*
  • Increased Flexibility*
  • 2 part ambient cured
  • Improved adhesion to steel and FBE*
  • Improved Cathodic Disbondment resistance*
  • Air temperature does NOT have to be 5°F above dew point
  • Applied by brush and roller or sprayed by High Spray Solids (HSS) System and Plural Component Spray equipment No solvents needed
  • High build up to 45 mils/ 1150 microns in one pass
  • 100% Solids (Wet film thickness same as dry film thickness)
  • VOC on mixed product 8.0 g/l
  • Can be applied to substrate at temperature down to 41°F/5°C
  • Chemical resistance in the pH range 2-14

 

More Rugged than Traditional Epoxy Coatings

  • Increased Abrasion Resistance, Impact Resistance, Gouge Resistance and Flexibility
  • Provides rugged protection at 20-30 mil instead of 40-70 mil

Improved Performance Over Traditional Liquid Epoxies

  • Improved adhesion to steel and FBE
  • Improved Cathodic Disbondment Resistance

Easier to Apply than some Abrasion Resistant Overcoat (ARO) products

  • Applied by plural component spray equipment, brush or roller
  • High build up to 45 mils / 1150 microns in one pass
  • Lower viscosity = easier to work with
  • Can be applied to substrate at temperatures down to 41°F/5°C


3M Scotchkote Abrasion Resistant Epoxy Coatings 328

Multiple Coats (Recoat Window)

Scotchkote coating 328 has been formulated to achieve a coating thickness of 45 mils/1150 microns in one application. If additional thickness is required then it is to be applied within the following time in table below. If the time is exceeded then abrade existing coating by brush blast or coarse sand paper before applying second coat.

Air Temperature Recoat Window

60°F (16°C)

6 hours

75°F (24°C)

4 hours

85°F (29°C)

2 hours

100°F (38°C)

1 hour



3M™ ScotchkoteAbrasion Resistant Epoxy Coating 328 Coverage per Kit Size (assume no waste)

Kit Material (lbs) 25 mils 28 mils 30 mils
50 ml 0.15 0.87 sq ft 0.78 sq ft 0.72 sq ft
450 ml 1.31 7.6 sq ft 6.8 sq ft 6.3 sq ft
1000 ml 2.91 16.9 sq ft 15.1 sq ft 14.1 sq ft
1.3 liter 3.87 22.4 sq ft 20.0 sq ft 18.7 sq ft
3.78 liter 11.0 63.8 sq ft 57.0 sq ft 53.2 sq ft
20 liter 58.2 337.6 sq ft 301.4 sq ft 281.3 sq ft
200 liter 582.0 3375.6 sq ft 3013.9 sq ft 2813 sq ft
         


Application

Scotchkote AREC 328 as an Abrasion Resistant Coating over FBE or Steel

3MScotchkoteAbrasion Resistant Epoxy Coating (AREC) 328 is applied with the same ease as traditional two part epoxy coatings. This makes it an easier way to protect factory-applied FBE coatings for directional drilling, thrust boring, river crossings, or similar applications. Scotchkote coating 328 is also ideal for the protection of field joints on pipe coated with a 3MScotchkoteFusion Bonded Epoxy Dual Coating System 6352.

Primary Benefits:

  • Easy to apply
  • Lower viscosity than many AROs
  • High build up to 45mils / 1150 microns in one pass

 

Scotchkote AREC 328 as a Traditional Corrosion Protection Coating

With strong adhesion to both metal and FBE, 3MScotchkoteAbrasion Resistant Epoxy Coating (AREC) 328 is also effective for use as a primary corrosion protection coating for directional drilling, rocky terrain, or other situations that require a rugged coating. Scotchkote coating 328 also demonstrates improved flexibility (greater than 4.0 °/PD at 70°F/20°C) over traditional liquid epoxy coatings for applications which require high flexibility after cure. With cathodic disbondment values lower than many traditional epoxy coatings, ARECs can also be used where long-term adhesion is critical.

Use an AREC when:

  • A rugged, abrasion resistant coating is required
  • A highly flexible field coating is required
  • Long term adhesion to metal is critical

 


Recommended Applications

  • An Abrasion Resistant Overcoat (ARO) over Factory Applied Fusion Bonded Epoxy (FBE) coatings
  • An abrasion resistant corrosion protection coating for the field joints of pipelines coated with an abrasion resistant parent coating
  • A high durability patch material for FBE
  • For rehabilitation of failing corrosion protection coatings
  • Off shore application with “S” and “J” lay
  • Internal lining of steel pipes
  • Corrosion protection of metal assets that may experience some expansion, shifting, or other sources of strain
  • Other field applications where corrosion protection is needed

  

Recommendations

  • Prepare only the quantity of coating that can be applied within given pot life.
  • A 1/4 in (6 mm) nap, lint free roller is suggested.
  • For the speed of application, and to extend the working time of the product, pour mixed product directly on to substrate/pipe, then pull the mixture down around pipe with brush or roller.
  • Because of the high viscosity of this product, we suggest mixing parts A & B together at temperatures above 60°F/15°C.


Using a brush or roller, apply Scotchkote coating 328 to a minimum thickness of 20 mils/500 microns or as specified. As an ARO, apply Scotchkote coating 328 to a minimum thickness of 40 mils/1000 microns. Overlap the pipe coating no less than 1 in /25 mm. Allow coating to properly cure before handling.
 

 

Hand Application

1. Mix part A and part B separately.

2. Pour part B into part A completely.

3. Thoroughly mix using mix stick until color consistency is achieved.


General Application Steps

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

1. Remove oil, grease, and loosely adhering deposits.

2. Abrasive blast clean surface to NACE SSPC-SP10, ISO 8501:1 SA-2 1/2 near white metal.

3. With air hose, clean blasted surface of any abraded debris then verify anchor profile is 1-4 mils/25-100 microns.

4. Apply Scotchkote coating 328 as soon as possible after blasting but no more than 4 hours.

5. Allow to cure per the requirements listed in time/ temperature table below.

6. Visually or electrically inspect the coating for defects.

7. Repair all defects using Scotchkote coating 328 as repair material.

Preparation

Pipe Surface Preparation Scotchkote coating 328 has excellent adhesion to poorly prepped surfaces. In pipe rehabilitation, remove old coating then examine pipe surface for corrosion. If minimal corrosion (SSPC-VIS 1 Rust Grade A) is noticed on pipe surface then a power tool can be use to remove the corrosion (SSPC SP- 11), then apply Scotchkote coating 328. CAUTION! If pipe surface has severe corrosion or pitting then a NACE #2/SSPC SP10 Near White Metal must be achieved with media blast.

3M Scotchkote Abrasion Resistant Epoxy Coatings 328

Product Handling Times* and Temperature

Product
Temperature 
Pot Life Dry To Touch
Time 
Back Fill Time

45°F (7°C)

50 minutes 10-12 hours 18-20 hours

60°F (16°C)

35 minues 3-4 hours 6-8 hours

75°F (24°C)

22 minutes 2-3 hours 4-5 hours

85°F (29°C)

18 minutes 60-80 minutes 2-3 hours

100°F(38°C)

10 minutes 40-60 minutes 90-120 minutes

120°F(49°C)

3 minutes 20-40 minutes 60-90 minutes

 

* Important! Times listed in the chart above are approximate and will vary due to ambient and substrate temperature as well as a combination of both.


Helpful Plural Component Spray Information

• Suggested tip size of 625/ 329.

• Tip pressure 2,500-3,000 psi/16-18 MPa.

• Preheat Part A to 140°-160°F/60°-70°C.

• Preheat Part B to 130°-150°F/55°-6C.

• Mix ratio of pumps is 3:1.


Equipment Clean-up

MEK or toluene may be used to clean spray equipment, rollers, and brushes. Utilize proper safety guidelines when working with solvent.


Multiple Coats

Scotchkote coating 328 has been formulated to achieve a coating thickness of 45 mils/1150 microns in one coat. If additional thickness is required, apply the additional coats within 4 hours of the initial coat at temperature of 70°F/20°C. This coating may be applied in any thickness consistent with producing an acceptable surface finish.

 

Directional Drilling

Scotchkote coating 328 has outstanding gouge resistance properties therefore can be applied on girth welds for directional drilling under rivers and roads. A minimum of 40 mils/1000 microns dry film thickness is required as a stand alone coating and 30 mils/625 microns as field applied ARO.

Properties

Product Name Product
Description
Sotck
Number 
Contents Billing Unit
      

3MScotchkote
Abrasion Resistant

Epoxy Coating 328

  
Scotchkote 328 1 Liter Kit - Part A  80-6300-0330-1 4 x 0.75L Containers of Part A in One Case  Case
 Scotchkote 328 1 Liter Kit - Part B 80-6300-0334-3  4 x 0.25L Containers of Part B in One Case Case 
 Scotchkote 328 3 Liter Kit - Part A 80-6300-0331-9  4 x 2.25L Containers of Part A in One Case Case 
 Scotchkote 328 3 Liter Kit - Part B 80-6300-0335-0  4 x 0.75L Containers of Part B in One Case  Case 
 Scotchkote 328 17 Liter Pail- Part A 80-6300-0332-7  1 x 17L Pail of 328 Part A (Order 3A:1B)  Each 
  Scotchkote 328 17 Liter Pail- Part B 80-6300-0333-5  1 x 17L Pail of 328 Part B  Each 
 Scotchkote 328 190 Liter Drumb - Part A 80-6300-0250-1  1 x 19L Drum of 328 Part A (Order 3AL1B)  Drumb 
 Scotchkote 328 190 Liter Drumb - Part B 80-6300-0251-9  1 x 190L Drum of 328 Part B  Drumb 

 

Coating Properties 
Property Results
Color Blue-Green
Mix Ratio  

Viscosity 70°F/20°C (cps)

Part A = 22,000
Part B = 14,000

Shelf Life (unopened)

24 months

Specific Gravity (g/cc)

Part A
Part B
Part A & B Mixed



1.34
1.48
1.38

Coverage(ft2/lb/mil)/(m2/kg/mm)

145/0.81

Minimum/Maximum Coating Thickness
(as a primary corrosion protection coating)

 

20/60 mils (500/1500 microns)

 

Minimum/Maximum Coating Thickness (as an ARO)

 

40/100 mils (1000/2500 microns)

 

Gel Time 70°F/20°C (minutes)
Dry to Touch Time 70°F/20°C (minutes)
Hard Dry Time (Shore D>70) (minutes)

 

38
155
255

 

Test Properties   
Property Test Description

 

Typical Values

Cathodic Disbondment

CSA Z245.20-10 (Cl. 12.8)

149°F/65°C, 28 days, 1.5V
176°F/80°C, 28 days, 1.5V
203°F/95°C, 28 days, 1.5V

4.1 mmr
4.4 mmr
3.7 mmr

 

Hot Water Soak Adhesion

CSA Z245.20-10 (Cl. 12.14)

167°F/75°C, 28 days
203°F/95°C, 28 days

 

Rating 1
Rating 1

Dry Film Adhesion to Steel

ASTM D-4541 (IV)

70°F/20°C

 

6100 psi

Dry Film Adhesion to FBE

ASTM D-4541 (IV

70°F/20°C

 

7200 psi

Flexibility

CSA Z245.20-10 (Cl. 12.11)

70°F/20°C

-22°F/-30°C

 

4.0 °/PD
1.2 °/PD

Abrasion Resistance

ASTM D4060-07

5000 Cycles with 1000 g load

375 mg

Impact Resistance

ASTM G14

14.0 J (40-60 mils)

 Pass

Gouge Resistance

CSA Z245.20-10 (Smooth Bit)

70 Kg

Pass 

Shore D Hardness

ASTM D785

70°F/20°C

82 

Repair

Repair Process

1. Remove oil, grease, and loosely adhering deposits.

2. Abrade the coating surface with medium grit sandpaper

(80 grit). Ensure that the surrounding coating is abraded on all sides of the holiday.

3. Ensure abraded surface is cleaned of any debris with air blast or clean lint free cloth.

4. With metal above 41°F/5°C, apply Scotchkote coating 328 at minimum film of 20 mil/ 500 microns.

 

Cold Weather Repair

1. Follow steps 1, 2 & 3 above.

2. Heat substrate to approximately 200°F using propane torch.

3. Apply Scotchkote coating 328 at minimum thickness of 20 mils/ 500 microns.