Bitumastic 300M Coal Tar Epoxy by Carboline

Bitumastic 300M Black Coal Tar Epoxy Protective Coating By Carboline

Selection & Specification Data


Coal Tar Epoxy


Renowned high build coal tar epoxy for protection for steel and concrete in single or two-coat applications in a broad variety of aggressive industrial applications.


Excellent chemical, corrosion and abrasion resistance
High-build up to 35 mils (875 microns) in a single coat
Compatible with controlled cathodic protection
Meets or exceeds all requirements of:
- Corp of Engineers C-200, C200a
- AWWA C-210-92 for exterior
- SSPC-Paint 16
- Steel Tank Institute Corrosion Control System STI-P3


Black (0900)


Will discolor, chalk and lose gloss in sunlight exposure.


Self-priming, Carboguard 888


Not recommended

Dry Film Thickness

16.0 mils (400 microns) in one or two coats. Total dry film thickness less than 8 mils (200 microns) or in excess of 35 mils (875 microns) not recommended.

Solids Content

By volume: 74% ± 2%

Theoretical Coverage Rate

1187 mil ft2 (29.1 m2/I at 25 microns). Allow for loss in mixing and application.

Nominal VOC Values

As supplied: 2.0 Ibs/gal (192 g/I)
Thinned: 20 oz/gal w/ #10: 2.6 Ibs/gal (307 g/I)
Thinned: 25 oz/gal w/ #10: 2.7 Ibs/gal (325 g/I)

Dry Temperature Resistance

Continuous: 350°F (177°C)
Non-Continuous: 370°F (190°C)

Wet Temperature Resistance

Immersion temperature should not exceed 120°F (49°C).


Do not use for potable water requirements.

Substrates & Surface Preparation



Surfaces must be clean and dry. Employ adequate methods to remove dirt, dust, oil and all other contaminants that could interfere with adhesion of the coating.


Immersion: SSPC-SP10.
Non-Immersion: SSPC-SP6 for maximum protection. SSPC-SP2 or SP3 as minimum requirement.
Surface Profile: 2.0-3.0 mils (50-75 micron).


Concrete must be cured 28 days at 75°F (24°C) and 50% relative humidity or equivalent. Prepare surfaces in accordance with ASTM D4258 Surface Cleaning of Concrete and ASTM D4259 Abrading Concrete. Voids in concrete may require surfacing.

Performance Data

Test Method

System Results Report #

ASTM D4060

Blasted Steel
2 cts. 300M

130 mg. loss after 1000 cycles. CS 17 wheel,
1000 gm load.


ASTM D4541

Blasted Steel
2 cts. 300M

1443 psi (pneumatic)


ASTM D2794

Blasted Steel
2 cts. 300M

Impact site diameter. Inches: 3/8, 3/8, 1/2.
100 in/Ibs Gardner Impactor at 1/2 in. diam.


Salt Fog

Blasted Steel
2 cts. 300M

No  blistering, rusting or delamination. No mea- surable undercutting at scribe after 2000 hrs.

Application Equipment

Spray Application (General)

This is a high solids coating and may require adjustments in spray techniques. Wet film thickness is easily and quickly achieved. The following spray equipment has been found suitable and is available from manufacturers such as Binks, DeVilbiss and Graco.

Conventional Spray

Pressure pot equipped with dual regulators, 3/8" LD. minimum material hose, with 50' maximum material hose .086" LD. fluid tip and appropriate air cap.

Airless Spray

Pump Ratio: 30:1
GPM Output: 3.0 (min.)
Material Hose: 1/2" ID. (min.)
Tip Size: 023-.035"
Output PSI: 2300-2500
Filter Size: 30 mesh
Teflon packings are recommended and available from the pump manufacturer.

Brush & Roller (General)

Recommended for touch up, striping of weld seams (General) and hard-to-coat areas only. Avoid excessive re­brushing or re-rolling.


Use a medium bristle brush.


Use a short-nap synthetic roller cover with phenolic core.

Mixing & Thinning


Power mix separately, then combine and power mix for a minimum of two minutes. DO NOT MIX PARTIAL KITS.


4:1 Ratio (A to B)


Up to 20 oz/gal (16%) with Thinner #10.
Up to 25 oz/gal (20%) Thinner #10 #10 for the first coat application to concrete. Use of thinners other than those supplied or recommended by Carboline may adversely affect product performance and void product warranty, whether expressed or implied.

Pot Life

75°F (24°C): 3 Hours
90°F (32°C): 1 Hour
Pot life ends when coating loses body and begins to sag.

Cleanup & Safety


Use #2 Thinner or Acetone. In case of spillage, absorb and dispose of in accordance with local applicable regulations.


Read and follow all caution statements on this product data sheet and on the MSDS for this product. Employ normal workmanlike safety precautions. Hypersensitive persons should wear protective clothing, gloves and use protective cream on face, hands and all exposed areas.


This product contains flammable solvents. Keep away from sparks and open flames. All electrical equipment and installations should be made and grounded in accordance with the National Electric Code. In areas where explosion hazards exist, workmen should be required to use non-ferrous tools and wear conductive and non-sparking shoes.


Bitumastic 300M, Part A
Bitumastic 300M, Part B

Carboline Thinner #10
Carboline Thinner #2

Application Conditions


Material Surface Ambient Humidity




50°F (10°C) 50°F (10°C) 50°F (10°C) 0%


90°F (32°C) 125°F (52°C) 110°F (43°C) 90%

Condensation due to substrate temperatures below the dew point can cause flash rusting on prepared steel and interfere with proper adhesion to the substrate. Special application techniques may be required above or below normal application conditions.

Curing Schedule
Surface Temp. & 50% Relative Humidity Dry to Touch Minimum
Recoat Time
Recoat Time
Cure for

50°F (10°C)

8 Hours 10 Hours 24 Hours 14 Days

75°F (24°C)

4 Hours 6 Hours 24 Hours 7 Days

90°F (32°C)

2 Hours 3 Hours 24 Hours 5 Days

These times are based on a 16.0 mil (400 micron) dry film thickness. Higher film thickness, insufficient ventilation, high humidity or cooler temperatures will require longer cure times. Excessive humidity or condensation on the surface during curing can interfere with the cure, can cause discoloration and may result in a surface haze. Any haze or blush _must be removed by water washing before recoating. If the maximum recoat time is exceeded, the surface must be abraded by sweep blasting prior to the application of additional coats. Holiday Detection (if required): Wet sponge types may be used if the dry film thickness is below 20 mils (500 microns). High voltage spark testing should b e used when the dry film thickness exceeds 20 mils (500 microns). Refer to NACE RP0188-90 for specific procedures.

Packaging, Handling & Storage

Shipping Weight (Approximate)

1.25 Gallon Kit
12 lbs (6 kg)
5 Gallons
50 Ibs (26 kg)

Flash Point (Setaflash)

75°F (24°C) for Part A
>200°F (93°C) for Part B

Storage (General)

Store Indoors.

Storage Temperature & Humidity

40°110°F (4°-43°C)
0-100% Relative Humidity

Shelf Life

24 months at 75°F (24°C)

Bitumastic is a century-old trade name that is often associated with long-term protection from water penetration. Typically made from coal tars and blends of resins such as epoxy, these products have been used as tank linings, to coat the interior and exterior of buried pipe, and to protect equipment subjected to water immersion.