PPG Sigmadur 550 H (formerly known as Sigmadur 568), two-component, high solids, high-build aliphatic acrylic polyurethane finish available in 2,300+ colours from RAL, NCS and BS.

The finish has excellent resistance to atmospheric exposure conditions with good colour and gloss retention, resisting splash of mineral and vegetable oils, paraffins, aliphatic petroleum products and mild chemicals.

Applies directly to metal and can be recoated even after long atmospheric exposure, curing at temperatures down to -5°C (23°F).

Features & Benefits

• Available in 2,300+ colours, inc. RAL, BS, NCS & the new NCS 2050 colours
• Excellent resistance to atmospheric exposure conditions
• Good colour and gloss retention
• Cures at temperatures down to -5°C (23°F)
• Resistant to splash of mineral and vegetable oils, paraffins, aliphatic petroleum products and mild chemicals
• Can be recoated even after long atmospheric exposure
• Good application properties by airless, brush and roller
• High film build-up to 150 µm (6.0 mils) for one coat
• Can be applied direct to metal
• Drying and curing times can be reduced significantly using PPG 866M ACCELERATOR

Product Data

Two-component, high solids, high-build aliphatic acrylic polyurethane finish

Notes:

• See below for more information on surface preparation, application details and curing times

Surface Preparation

Recommended Substrate Conditions and Temperatures

Substrate conditions

• Steel; blast cleaned to ISO-Sa2½, blasting profile 40 – 70 µm (1.6 – 1.8 mils), or power tool cleaned to ISO-St3
• Compatible previous coat must be dry and free from any contamination

Substrate Temperature & Application Conditions

• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point
• Substrate temperature during application and curing down to -5°C (23°F) is acceptable; provided the substrate is free from ice and dry
• Relative humidity during application and curing should not exceed 85%
• Premature exposure to early condensation and rain may cause colour and gloss change

Application

Instructions for Use

Mixing ratio by volume: base to hardener 87:13

• Do not thin more than is required by appropriate application property
• Adding too much thinner results in reduced sag resistance
• Thinner should be added after mixing the components

Induction Time

None.

Pot life

• 2.5 hours at 20°C (68°F)

Refer below for more information

Air spray

Recommended thinner

• THINNER 21-06

Volume of thinner

• 10 - 15%, depending on required thickness and application conditions

Nozzle orifice

• 1.0 - 1.5 mm (approx. 0.040 - 0.060 in)

Nozzle pressure

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

Airless spray

Recommended thinner

• THINNER 21-06

Volume of thinner

• 0 - 10%, depending on required thickness and application conditions

Nozzle orifice

• Approx. 0.43 – 0.48 mm (0.017 – 0.019 in)

Nozzle pressure

• 20.0 MPa (approx. 200 bar; 2901 p.s.i.)

Brush/roller

Recommended thinner

• THINNER 21-06

Volume of thinner

• 0 – 5%

Spreading Rate and Film Thickness

Overcoating interval for DFT up to 150 µm (6.0 mils)

Overcoating interval with PPG 866M ACCELERATOR for DFT up to 150 µm (6.0 mils)

Note: Surface should be dry and free from any contamination

Curing time for DFT up to 150 μm (6.0 mils)

Curing time with PPG 866M ACCELERATOR for DFT up to 150 µm (6.0 mils)

Notes:

• Adequate ventilation must be maintained during application and curing (please refer to INFORMATION SHEETS)
• Safe Working in Confined Spaces (1433) and Directives for Ventilation Practice (1434)
• Premature exposure to early condensation and rain may cause colour and gloss change

Pot Life (at application viscosity)

Note:

• Mixing this product with PPG 866M ACCELERATOR will not affect the pot life

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 vapour, as well as contact between the wet paint and exposed skin or eyes
• Contains a toxic polyisocyanate curing agent
• Avoid at all times inhalation of aerosol spray mist

References

• 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)