PPG Sigmaline 2500, a two-component, solvent-free amine cured novolac phenolic epoxy one-coat system direct to metal for pipe internals and externals. The coating has excellent resistance to cathodic protection and resists crude oil up to 120°C (250°F).

Fast-curing, especially when applied to preheated substrates, Sigmaline 2500 can be applied to rotating pipes at a dry-film thickness (DFT) up to 600 µm (24.0 mils) at a substrate temperature up to 90°C (194°F).

Features & Benefits

• One-coat system direct to metal for pipe internals and externals
• Excellent resistance to cathodic protection
• Excellent resistance to crude oil up to 120°C (250°F)
• Glossy and smooth appearance
• Reduced explosion risk and fire hazard
• Fast-curing, especially when applied to preheated substrates
• Can be applied to rotating pipes at a dry-film thickness (DFT) up to 600 µm (24.0 mils) at a substrate temperature up to 90°C (194°F)

Product Data

Two-component, solvent-free amine cured novolac phenolic epoxy coating

Notes:

• Refer below for more details on spreading rate and film thickness, overcoating intervals and curing times

Surface Preparation

Recommended Substrate Conditions and Temperatures

Substrate conditions

• Steel; blast cleaned to a minimum of ISO-Sa2½ (SSPC SP-10), blasting profile 50 – 100 µm (2.0 – 4.0 mils)

Substrate Temperature & Application Conditions

• Substrate temperature during application and curing should be above 15°C (59°F)
• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point
• Substrate temperature during automatic application between 40°C (104°F) and 60°C (140°F) is recommended, which will ensure good curing and appearance

Application

Instructions for Use

Mixing ratio by volume: base to hardener 80:20 (4:1)

• Application with twin-feed hot airless spray equipment

Induction Time

• None.

Airless spray

• Twin-feed, hot airless spray
• Pumping viscosity is achieved at 40°C (104°F) to 60°C (140°F)
• Temperature in the mixing unit must be between 40°C - 70°C (104°F - 158°F)

Recommended thinner

• No thinner should be added

Nozzle orifice

• Approx. 0.48 – 0.78 mm (0.019 – 0.031 in)

Nozzle pressure

At 40°C (104°F) paint temperature min. 19.0 MPa (approx. 190 bar; 2756 p.s.i.). At 60°C (140°F) min. 15.0 MPa (approx. 150 bar; 2176 p.s.i.)

Note:

• Sag resistance depends on both paint and substrate temperature. Film build can be optimized by applying multiple passes wet-in-wet after allowing the previous pass to set

Brush/roller

Only for touch-up and spot repair

Recommended thinner

• No thinner should be added

Cleaning Solvent

• THINNER 90-83 or 90-53.

Note:

All application equipment must be cleaned immediately after use. Paint inside the spraying equipment must be removed before the pot life has been expired.

Spreading Rate and Film Thickness

Note:

• Maximum DFT when brushing: 150 µm (6.0 mils)

Overcoating interval for DFT up to 600 µm (24.0 mils)

Notes:

• Surface should be dry and free from any contamination

Curing time for DFT up to 600 µm (24.0 mils)

Notes:

• Adequate ventilation must be maintained during application and curing (please refer to information sheets information sheet 1433 and Directives for Ventilation Practice (information sheet 1434)

Pot Life (at application viscosity)

Note:

• Due to exothermic reaction, temperature during and after mixing may increase

Safety Precautions

• For paint and recommended thinners, see information sheets information sheet 1430, information sheet 1431 and the relevant Material Safety Data Sheets in the attachments section above
• Although this is a solvent-free paint, care should be taken to avoid inhalation of spray mist, as well as contact between the wet paint and exposed skin or eyes
• Ventilation should be provided in confined spaces to maintain good visibility

References

• Conversion Tables (information sheet 1410)
• Explanation to product data sheets (information sheet 1411)
• Safety Indicators (information sheet 1430)
• Safety in Confined Space and Health Safety, Explosion Hazard - Toxic Hazard (information sheet 1431)
• Safe Working in Confined Spaces (information sheet 1433)
• Directives for Ventilation Practice (information sheet 1434)
• Cleaning of Steel and Removal of Rust (information sheet 1490)
• Specification for Mineral Abrasives (information sheet 1491)
• Surface Preparation of Steel Pipes and Fittings Shop Application (information sheet 1492)
• Internal Chemical Cleaning of Steel Pipes (information sheet 1493)
• Relative humidity - Substrate Temperature - Air Temperature (information sheet 1650)