Polyurethane

Polyurethane coatings alter the surface hardness of any substrate to provide abrasion resistance, friction control and noise reduction.

Polyurethane Coating Technology

Polyurethane is an elastic, rubber-like polymer which is applied in liquid form using an airless spray gun system, cartridge system, or a conventional HVLP spray gun.

Prior to the application of any polyurethane, all substrates must be cleaned thoroughly and this is done via a sandblasting process. The sandblasted finish provides a key for the coating to adhere to. Polyurethane is applied at room temperature and cures within 12 to 24 hours.

There are two family types of polyurethane – aliphatic and aromatic. Aliphatic polyurethane comprises a chain structure whereas aromatic polyurethane comprises a ring structure in its molecular make-up. A polyurethane polymer forms from mixing two components – it is a two-pack coating which uses the reaction between the two components to create the coating.

Aromatic polyurethanes have better chemical and abrasion resistance than aliphatic polyurethanes but lower flexibility and UV resistance.

Polyurethane coatings are versatile in that different properties can be obtained from what is ostensibly the same coating. For example, a soft, high-traction finish in one case or a hard, low-friction finish in another. All the coatings applied by Marcote have a high gloss appearance and exceptional weathering performance.

The versatility of polyurethane means it can be used within all sorts of industries, such as food, packaging, engineering, pharmaceutical, and transportation.

Overview of Performance Properties

  • Abrasion resistance
  • Cavitation protection
  • Chemical resistance
  • Corrosion resistance
  • Electrical insulation
  • Hydrophobic
  • Impact resistant
  • Low friction
  • Scratch protection
  • Seamless coating
  • Sound deadening/noise reduction

Common Components for Coating

  • Chutes and hoppers
  • Cyclones
  • Mixers
  • Pumps
  • Quarry plant and equipment
  • Shotblast cabinets
  • Turbines
  • Valve bodies
  • Vibratory deburring and polishing bowls
  • Vibratory feeder bowls
  • Vibratory lateral feeders

Performance Information

Coating Thickness – From 0.5mm upwards

Colour – Limited range of primary colours

Chemical Resistance – Excellent (for specific applications)

Corrosion Resistance – Excellent (for specific applications)

Electric Resistance – Electrical Insulator – breakdown voltage >5kV/mm

Fatigue Resistance – Excellent

Flammability – Non-Flammable

Friction0.2 to 0.7 (depending on hardness)

Hardness – Between 50 and 98 Shore A available

Heat Conductivity – Low

Loadability – Fair

Release Properties – Fair

Surface RoughnessRa < 1 µm

Temperature Resistance – -50°C to +130°C

Wear Resistance – Excellent

As a part of our commitment to quality, care and communication, we invite you to contact us to explore how we can assist you and meet your specific needs.

Surfaces that polyurethane coatings can be applied to

Metallic substrates

Aluminium
Stainless Steel
Steel Alloys
Carbon Steel
Magnesium
Brass
Copper

Non-Metallic substrates

Rubber
Carbon Fibre
Glass Fibre
Plastics
Glass

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