PPG - Sigmadur 550H is a twin pack, high-solids, high-build polyurethane finish with Excellent resistance to atmospheric exposure conditions

Features

• Good color 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

Recommended Substrate Conditions and Temperatures

Substrate conditions

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

Substrate temperature and 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 my cause color and gloss change

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 component

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%