PPG AquaWeld 100 (also known as Sigma AquaWeld 100) is a two-component, moisture-curing, waterborne low zinc (ethyl) silicate prefabrication primer that is suitable for automatic application on shot-blasted steel plates.

Top Features & Benefits

• Fast drying properties
• Good cutting and excellent welding properties, including MIG/MAG welding in various positions (either automatic or manual welding)
• Provides regular, smooth weld seams
• Low fume release during welding and cutting
• No adherence of weldspatter at surrounding primed surface
• Good thermal stability minimizes heat damage during hot work procedures
• For use in seawater immersion in combination with controlled cathodic protection systems; please contact your Rawlins Paints for more information
• Certified by Lloyds Register and SLV
• Flat finish

Product Data

RECOMMENDED SUBSTRATE CONDITIONS AND TEMPERATURES

Substrate conditions

• Steel; shot blast cleaned to ISO-Sa2½, blasting profile 40 – 70 µm (1.6 – 2.8 mils)
• Substrate must be dry, free from oil, grease and any contamination
• 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 and application conditions
• Substrate temperature during application should be between 25°C (77°F) and 40°C (104°F)
• Substrate temperature during automatic application should be between 30°C (86°F) and 35°C (95°F)
• Substrate temperature during application should be at least 3°C (5°F) above dew point
• Relative humidity during application and curing should be above 50%
• Relative humidity during application and curing should not exceed 85%

SYSTEM SPECIFICATION

First coat shall be SIGMACOVER 280 or SIGMAPRIME 200 or other approved systems

SECONDARY SURFACE PREPARATION

During storage and construction, contamination of the prefabrication primer should be limited. After fabrication, surface defects should be treated according to the scheme hereafter. Where two possible surface treatments are indicated, the choice of treatment is dependent on the location and on the system to be applied (see below table). The preferred pre-treatment for optimal results is shown; other possibilities are indicated in brackets

The atmospheric corrosive conditions to which the shop primer coated steel is exposed to in the given performance period should not exceed C3 corrosive atmosphere according to ISO 12944-2 and where appropriate steel plate atmospheric exposure should be minimized by shielding or internal storage to prolong the life time of the shop primer coated steel. When stored outside, ponding water must be prevented by stacking the plates in a slightly tilted position and capillary effects should be avoided by using spacers in between plates

INSTRUCTIONS FOR USE

On steel blasted to recommended profile a DFT of 18 µm (0.7 mil) corresponds to 22 µm (0.9 mil), as measured on a smooth test panel; Minimum thickness for a closed film is 15 µm (0.6 mil) measured on smooth a test panel.

Adequate ventilation must be maintained during application and curing Mixing ratio by weight: binder to powder 48:52. Pour the binder into the empty steel drum. Add the powder to the binder. The temperature of the mixture of binder and powder should preferably be above 15°C (59°F).

Stir the powder thoroughly into the binder. Stir thoroughly until homogeneous. Strain mixture through a 30 – 60 mesh screen. Mixed paint is ready for use.

Agitate continuously during application, adjust speed so foam formation will be minimized. Best performance is obtained when the sprayed steel structure is stored dry for 24 hours. Mixed paint should not be stored in closed containers, please consult your local PPG Protective & Marine Coatings sales office.

Pot life

4 hours at 20°C (68°F)

Airless spray

Restricter plate PN029025 (Nordson) prior to nozzle

Recommended thinner: No thinner should be added

Nozzle orifice: Approx. 0.43 – 0.53 mm (0.017 – 0.021 in)

Nozzle pressure: 8.0 - 12.0 MPa (approx. 80 - 120 bar; 1161 - 1741 p.s.i.)

Cleaning Solvent

Tap water and PPG Thinner 70-05

Cleaning Procedures

• Pulsator filter and tip filter must be taken out of the equipment and cleaned properly
• The following tables illustrate the cleaning procedure of the spray equipment when changing from spraying with solvent-borne paint to waterborne paints (table 1) and from waterborne paints to solvent-borne paints (table 2)

SAFETY PRECAUTIONS

• For paint and recommended thinners see INFORMATION SHEETS 1430, 1431 and relevant Material Safety Data Sheets
• Although this is a waterborne paint, care should be taken to avoid inhalation of spray mist, 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)
• 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)
• CLEANING OF STEEL AND REMOVAL OF RUST
• RELATIVE HUMIDITY – SUBSTRATE TEMPERATURE – AIR TEMPERATURE