PPG SigmaGuard 720, a two-component, reinforced high solids tank coating, based upon polyamine adduct cured pure epoxy technology. The coating has recognized corrosion control (Lloyd's Register) and short curing periods, curing at low temperatures down to 5°C (41°F).

Features & Benefits

• Tank coating with good chemical resistance against a wide range of chemicals
• Short curing periods
• Good low-temperature curing
• Easy to clean
• Recognized corrosion control coating (Lloyd's Register)
• Can be used at temperatures above 15°C (59°F)
• Can be applied easily by spray
• Touch dry after 2-3 hours
• Can be overcoated after 8 hours
• See below for more information on surface preparation, application details and curing times

Product Data

Two-component, reinforced high solids tank coating, based upon polyamine adduct cured pure epoxy technology.

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, blasting profile 40 – 70 µm (1.6 – 2.8 mils)
• Previous coat must be dry and free from any contamination
• Surface of previous coat should be sufficiently roughened if necessary

IMO-MSC.288(87) requirements for cargo tanks of crude oil tankers

• Steel; ISO 8501-3:2006 grade P2, with all edges treated to a rounded radius of minimum 2 mm (0.079 in) or subject to three pass grinding or at least equivalent process before painting
• Steel; blast cleaned to ISO-Sa2½, blasting profile 30 – 75 µm (1.2 – 3.0 mils)
• Dust quantity on the surface to be coated must not exceed rating "1" for dust size class "3", "4" or "5" (ISO 8502-3-2017). Lower dust size classes (“1” and/or “2”) to be removed if visible without magnification.

Substrate Temperature & Application Conditions

• Substrate temperature during application and curing should be above 5°C (41°F)
• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point

System Specification

System for chemical resistance according to the latest issue of the chemical resistance list.

• SIGMAGUARD 720: 125 µm (5.0 mils)
• SIGMAGUARD 720: 125 µm (5.0 mils)

System for cargo tanks of Crude Oil Tankers according to IMO resolution MSC.288(87).

• SIGMAGUARD 720: 160 µm (6.3 mils)
• SIGMAGUARD 720: 160 µm (6.3 mils)

Application

Instructions for Use

Mixing ratio by volume: base to hardener 75:25 (3:1)

• The temperature of the mixed base and hardener should preferably be above 15°C (59°F), otherwise extra thinner may be required to obtain application viscosity
• Adding too much thinner results in reduced sag resistance and slower cure
• Thinner should be added after mixing the components

Induction Time

Allow induction time before use

Air spray

Recommended thinner

• THINNER 91-92

Volume of thinner

• 5 - 15% for a one coat application of 125 µm (5.0 mils) DFT

Nozzle orifice

• 1.8 – 2.0 mm (approx. 0.070 – 0.079 in)

Nozzle pressure

• 0.3 - 0.4 MPa (approx. 3 - 4 bar; 44 - 58 p.s.i.)

Airless Spray

Recommended thinner

• THINNER 91-92

Volume of thinner

• 0 - 10% for a one coat application of 125 µm (5.0 mils) DFT

Nozzle orifice

• Approx. 0.53 – 0.69 mm (0.021 – 0.027 in)

Nozzle pressure

• 15.0 MPa (approx. 150 bar; 2176 p.s.i.)

Brush/roller

• For stripe coating and spot repair only

Cleaning Solvent

• 90-53.

Spreading Rate and Film Thickness

Note:

• Maximum DFT when brushing: 100 µm (4.0 mils)

Overcoating interval for DFT up to 125 µm (5.0 mils)

Notes:

• Surface should be dry and free from any contamination

Curing time for DFT up to 125 µm (5.0 mils)

Notes:

• Minimum curing time of SIGMAGUARD 720 tank coating system before transport of cargoes with note 4, 7, 8 or 11: 3 months
• For detailed information on resistance and resistance notes, please refer to the latest issue of the Tank Coating Resistance List (TRIS)
• 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)

Curing time for DFT up to 125 µm (5.0 mils)

Pot Life (at application viscosity)

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
• This is a solvent-borne paint and care should be taken to avoid inhalation of spray mist or vapor, as well as contact between the wet paint and exposed skin or eyes

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)
• Relative humidity - Substrate Temperature - Air Temperature (information sheet 1650)