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
More Rugged than Traditional Epoxy Coatings
Improved Performance Over Traditional Liquid Epoxies
Easier to Apply than some Abrasion Resistant Overcoat (ARO) products
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™ Scotchkote™ Abrasion 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
3M™ Scotchkote™ Abrasion 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 3M™ Scotchkote™ Fusion Bonded Epoxy Dual Coating System 6352.
Primary Benefits:
Scotchkote AREC 328 as a Traditional Corrosion Protection Coating
With strong adhesion to both metal and FBE, 3M™ Scotchkote™ Abrasion 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:
Recommended Applications
Recommendations
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°-65°C.
• 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 |
3M™ Scotchkote™ |
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 |
Shelf Life (unopened) |
24 months |
Specific Gravity (g/cc) Part A |
|
Coverage(ft2/lb/mil)/(m2/kg/mm) |
145/0.81 |
Minimum/Maximum Coating Thickness |
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) |
38 |
Test Properties | |||
Property | Test Description |
|
Typical Values |
Cathodic Disbondment |
CSA Z245.20-10 (Cl. 12.8) |
149°F/65°C, 28 days, 1.5V |
4.1 mmr |
Hot Water Soak Adhesion |
CSA Z245.20-10 (Cl. 12.14) |
167°F/75°C, 28 days |
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 |
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.