Denso Protal 7900HT is a VOC free, 100% solids epoxy coating for pipelines operating at higher temperatures. It is a high-build liquid coating that can be hand or spray applied in one coat in the field or shop. It cures fast to allow quick backfill when applied to hot pipe.

Uses

Spray or hand applied to pipelines operating at temperatures up to 250°F (121°C). Used on girth welds, pipe, fittings, valves and fabrication.

Features

Application

1. By Hand:
   Prepare surfaces by grit blasting to a clean near white finish, SSPC-SP 10/NACE No. 2. Mix each of the base and hardener to an even consistency. Add the hardener to base and mix until an even color is achieved making sure all sides of container are scraped. Product shall be applied to surfaces ranging from 40°F (4°C) to 220°F (105°C) at a minimum of 30 mils. Immediately pour mixed material onto surface and brush, trowel or roll to required mil thickness. A wet film thickness gauge should be used to measure mil thickness.
    
2. Spray:
   Prepare surfaces by grit blasting to a clean near white finish, SSPC-SP 10/NACE No. 2. The equipment should be a plural component airless spray unit with a proportioning pump capable of a volume mixing ratio of 3:1. Standard ancillary equipment should include minimum 10 gallon hoppers, static mixers, whip hose, and mastic gun. (Applicator should consult with Denso regarding recommended equipment). Product shall be applied to surfaces ranging from 40°F (4°C) to 220°F (105°C). A wet on wet spray technique should be used to achieve a minimum thickness of 30 mils. The coating thickness should be measured using a wet film thickness gauge.

Solids Content

100%

Base Component - unmixed @ 77°F (25°C)
     Specific Gravity
     Viscosity
     Color

1.54
197,000 cps
White

Hardener Component - unmixed @ 77°F (25°C)
     Specific Gravity
     Viscosity
     Color

1.43
90,000 cps
Black

Mixed Material - mixed @ 77°F (25°C)
     Specific Gravity
     Viscosity
     Color

1.51
164,000 cps
Gray

Mixing Ratio by Volume

3 parts base: 1 part hardener

Theoretical Coverage

14 ft² / 30 mils / liter

Cure Times
     Pot Life @ 77°F (25°C), 100 gram
     Handling Time @ 77°F (25°C)

40 to 45 minutes
6 to 8 hours

Theoretical Coverage

14 ft² (1.3 m²) / 30 mils / liter

Thickness
     Minimum
     Maximum

  
30 mils
60 mils

Holiday Detection

100 volts / mil

Hardness (ASTM 2240)

Shore D min. 85

Resistance to Cathodic Disbondment

Excellent

Abrasion Resistance

Excellent

Adhesion to Steel

3,030 psi

Maximum Service Temperature

250°F (121°C)

Intermittent Maximum Service Temperature

302°F (150°C)

Pot Life @ 77°F (25°C)

30 minutes

Initial Handling @ 77°F (25°C)

4 to 6 hours

Initial Handling @ 220°F (104°C)

15 to 20 minutes

Storage

Minimum 24 months when stored in original containers above 40°F (4°C). On job-site where temperatures are below 68°F (20°C), product must be kept warm to mix properly.

Cleaning

Clean equipment with solvent cleaner (Xylene 95%, Butanol 5%).

Packaging

1.0 liter and 2.0 liter kits. For spray applications, sold in 75 liter and 800 liter drums. Special kit sizes are available on request.