PPG - Sigmatherm 350 is a heat-resistant silicone/acrylic finish that has excellent resistance against weathering.

Features

• Excellent resistance against weathering
• A minimum drying time of 3 days at 20°C (68°F) should be allowed before exposure to heat
• Heat-resistant up to 350°C (660°F)
• To be used for the internal and external protection of steel surfaces
• Widely compatible with inorganic zinc primers

Recommended Substrate Conditions and Temperatures

Substrate conditions

• Thermal aluminum sprayed steel or thermal zinc sprayed steel must be dry and free from any contamination
• Suitable coating (zinc silicate primer) must be dry, free from any contamination and zinc salts
• Steel; blast cleaned to a minimum of ISO-Sa2½, blasting profile 40 – 70 µm (1.6 – 2.8 mils)

Substrate temperature and application conditions

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

Instructions For Use

• By using a mist coat technique, it is possible to apply SIGMATHERM 350 on top of a zinc silicate primer
• Power agitate to uniform consistency

Air spray

Recommended thinner

No thinner should be added

Nozzle orifice

1.5 – 2.0 mm (approx. 0.060 – 0.079 in)

Nozzle pressure

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

Airless spray

Recommended thinner

No thinner should be added

Nozzle orifice

Approx. 0.38 – 0.48 mm (0.015 – 0.019 in)

Nozzle pressure

12.0 - 15.0 MPa (approx. 120 - 150 bar; 1741 - 2176 p.s.i.)

Brush/roller

• Only for touch-up and spot repair

Cleaning solvent

THINNER 21-06