PPG SigmaGuard CSF 585 is a two-component, solvent-free, amine-cured epoxy tank coating for the storage of drinking water (approved by KIWA Holland) up to 60°C (140°F), for use with SIGMACOVER 522 primer. The coating meets NSF/ANSI Standard 61 for potable water when applied and used as described on nsf.org/

SigmaGuard CSF 585 has reduced fire hazard and explosion risk, with good visibility in confined spaces due to its light colour.

Features & Benefits

• Tank coating for drinking water
• Can be applied by single-feed, airless spray equipment
• Reduced explosion risk and fire hazard
• Solvent-free
• Good visibility in confined spaces due to light colour
• Suitable for storage of drinking water up to 60°C (140°F) with SIGMACOVER 522 primer
• Approved for drinking water by: KIWA Holland
• Meets NSF/ANSI Standard 61 for potable water when applied and used as described on nsf.org/

Product Data

Two-component, solvent-free, amine-cured 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

Carbon steel

• Steel; blast cleaned to ISO-Sa2½, blasting profile 50 – 100 µm (2.0 – 4.0 mils)
• If a holding primer is required SIGMACOVER 280 (DFT of 50 µm (2.0 mils)) or SIGMAPRIME 200 (DFT of 75 µm (3.0 mils)) should be used

Concrete

• Remove grease, oil and other penetrating contaminants according to ASTM D4258
• Abrade the surface per ASTM D4259 to remove all chalk and surface glaze or laitance. Achieve surface profile - ICRI CSP 3 to 5
• AMERCOAT 114 A may be used as a pit filler for certain applications. Check with PPG Technical Service for guidance on chemical resistance
• Maximum recommended moisture transmission rate is 3 lbs / 1,000 ft2 / 24 hours by moisture transmission test (ASTM F1869, calcium chloride test or by ASTM D4263, plastic sheet test)
• Alternatively, ASTM D4944 (Calcium Carbide Gas method) can be used, moisture content should not exceed 4%

Substrate Temperature & Application Conditions

• Substrate temperature during application should be above 10°C (50°F)
• Substrate temperature during application should be at least 3°C (5°F) above dew point

Application

Instructions for Use

Mixing ratio by volume: base to hardener 77.5:22:5

• At lower temperature, the viscosity will be too high for spray application
• The temperature of the mixed base and hardener should preferably be at least 20°C (68°F)
• No thinner should be added
• For recommended application instructions, see working procedure

Induction Time

Airless spray

• Use heavy-duty, single-feed, airless spray equipment, preferably 60:1 pump ratio and suitable high-pressure hoses
• In-line heating or insulated hoses may be necessary to avoid cooling down of paint in hoses at low air temperature
• Application with 45:1 airless spray equipment is possible, provided in-line, heated high-pressure hoses are used
• Length of hoses should be as short as possible

Recommended thinner

• No thinner should be added

Nozzle orifice

• Approx. 0.53 mm (0.021 in)

Nozzle pressure

At 20°C (68°F) paint temperature min. 28.0 MPa (approx. 280 bar; 4061 p.s.i.). At 30°C (86°F) min. 22.0 MPa (approx. 220 bar; 3191 p.s.i.)

Note:

In case of using 45:1 airless spray equipment, the paint must be heated to approximately 30°C (86°F) in order to obtain the right application viscosity

Brush/roller

Recommended thinner

• No thinner should be added

Cleaning Solvent

• THINNER 90-83 (preferred) 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: 100 µm (4.0 mils)

Measuring wet film thickness

• A difference is often obtained between the measured apparent WFT and the real applied WFT. This is due to the thixotropy and the surface tension of the paint, which retards the release of air, trapped in the paint film for some time
• A practical recommendation is to apply a WFT, which is equal to the specified DFT plus 60 µm (2.4 mils)

Measuring dry film thickness

• Because of low initial hardness the DFT cannot be measured within some days, due to the penetration of the measuring device into the soft paint film
• The DFT should be measured using a calibration foil of known thickness placed in between the coating and the measuring device

Overcoating interval for DFT up to 300 µm (12.0 mils)

Notes:

• Surface should be dry and free from any contamination

Curing time for DFT up to 300 µm (12.0 mils)

Notes:

• For the first 24 hours the maximum RH must be 50% or lower at 10°C (50°F)
• 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)
• SIGMAGUARD CSF 585 must not be applied at temperatures below 10°C (50°F)
• For drinking water tanks, a tank wash should be carried out after full cure and before the tank goes into service
• For storage and transport of drinking water the recommended working procedure should be followed

Washing procedures

• The recommended washing procedure must be applied after completion of the application.
• Sufficient time for full-curing and ventilation must be allowed in accordance with the recommendations as stated in the latest Product Data Sheets and working procedure.
• Always an adequate washing procedure should be followed.
• Several adequate washing procedures are available and may be used (see e.g. washing procedure described in relevant certificate).

Example 1: Adequate washing procedure

• After full curing of the system as per the latest PDS, the tank should be filled completely with fresh tap water
• The fresh tap water should remain in the tanks at least 4 full days
• Afterwards all tank compartments such as inner hull sides, bottom and deck-heads etc. should be thoroughly washed using high pressure water
• After washing, the tanks should be thoroughly drained
• After this procedure the tanks will be fit to carry drinking water

Example 2: Adequate washing procedure

• All personnel should wear watertight suits, boots and gloves properly cleaned with a sodium hypochlorite solution (1% active chlorine per liter)
• All tank sides, bottom and deckheads etc. should be brush cleaned or high-pressure spray cleaned with 1% active chlorine solution as above|note: this can also be done by butterworth washing
• All parts should be high pressure cleaned with tap water and tanks drained
• Concentrated active chlorine solution should be sprinkled on bottom; approx. 1 litre per 10 m² (1 quart per 100 ft²)
• Tanks should be filled with tap water to a depth of approx. 20 cm (8 inches) and the water should remain in the tank for at least 2 hours (max. 24 hours)
• Tanks should be thoroughly flushed out with tap water
• Depending upon local regulations it may be necessary to take water samples, after filling tank completely, to check on bacteria
• After this procedure the tanks will be fit to carry drinking water

Pot Life (at application viscosity)

Note:

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

Disclaimer

• SIGMAGUARD CSF 585 is especially developed for the storage and transport of drinking water and is approved for purpose in accordance with the requirements of the relevant certificate
• In order to fulfill the requirements it is important that the coating is well ventilated during application and curing and that the coating has received full curing
• Furthermore the recommended washing procedure should be followed before exposure to drinking water, in line with our latest datasheet and working procedure
• After the washing procedure, Rawlins Paints & PPG Protective & Marine Coatings does not accept any responsibility or liability for any odour, taste or contamination imparted to the drinking water from the washing products retained in the coating

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
• No solvent present; however, spray mist is not harmless, a fresh air mask should be used during spraying
• 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)
• Relative humidity - Substrate Temperature - Air Temperature (information sheet 1650)