• White with a slight sheen

• Spray : 1.6mm wet film thickness
• Brush : 0.76mm wet film thickness
• For airless spraying, several thin coats as opposed to one heavy coat will give greater control over finish and thickness.

• Approximately 25m√ per pail at 0.5mm dry film thickness.
• Practical coverage is dependent on surface texture and application technique.

• One or more, as required.

• By air drying.

• Approximately 6 hours at 20°C and 50%RH for 0.4mm wet film thickness.

• 72% +/- 2.

• 1.33kg/ltr.

• Flame spread 5, smoke development 35 when tested to ASTM E84.

• 80 shore D when tested to ASTM D2240.

• 18kg/m when tested to ASTM D2794.

• 0.6505g/1000 cycles when tested to ASTM D4060.

• 8.0 ± 0.2 at 25°C.

• Structures protected with SprayFilm WB3 have undergone fire resistance tests in approved independent laboratories to recognised standards throughout the world including:
  • Canada & US (to ASTM E119 and ASTM E84) *UK (to BS 476 Part 21)

Assessed in accordance with ASFP “Fire Protection for Steel buildings” procedures. As referenced in Approved document B of the Building Regulations 1991.

• The thickness of the fire protection for a given period of fire resistance in a cellulosic type fire, relates to the Hp/A ratio of the section. Hp/A is the ratio of the heated perimeter exposed to fire to the cross-sectional area of steel.

  All column and beam sections have their own specific Hp/A ratio. Refer to the ‘Technical Introduction’ to establish the Hp/A ratio for a particular beam or column section, or contact Cafco International. Then use the SprayFilm WB3 Thickness Chart to ascertain the required thickness.

  For advice on thickness calculations for I and H section beams and columns, castellated sections, composite floors, upgrading of concrete slabs and more complex situations, please contact Cafco International.

• Before applying SprayFilm WB3 to structural steel, the steel must be primed with a suitable primer, approved by Cafco International and applied in full compliance with the manufacturer’s recommendations.

  Primers compatible with SprayFilm WB3 are generally of the following types:

  • Epoxypolyamide
  • Zinc rich epoxy*
  • Vinyl modified epoxy
  • Alkyd
  • Phenolic resin modified alkyd

  Organic and inorganic Zinc Silicate Primers are not recommended for use with SprayFilm WB3.

  Contact Cafco International for confirmation of primer compatibility.

  *If left exposed for long periods Zinc Rich Epoxies may form a layer of zinc salt on the surface. These salts must be completely removed before applying SprayFilm WB3. Contact Cafco International Technical Department for further advice.

  Primed surface must be free from grease, oil, rust, dirt or any other contaminant that may inhibit the bonding of the SprayFilm WB3 to the primer.

• SprayFilm WB3 is supplied ready for use and should not be diluted.
  The primer thickness should be measured and recorded prior to the application of the SprayFilm WB3, in order to accurately check the thickness of the SprayFilm WB3 during and after application.
  Stir the SprayFilm WB3 throughly with a drill type mixer prior to application by either airless spray, brush or roller.
  Protect from rain and high humidity during application and drying.
  A SprayFilm WB3 application manual is available on request.

• To ensure the correct thickness is being applied, frequent measurements should be taken using a wet film thickness gauge. To determine approximate dry film thickness (dft) based on wet film thickness (wft), multiply wft by 0.72. For example, l.3mm wft x 0.72= 0.936mm dft.

• Take a dry film thickness reading as soon as the coating is fully cured (minimum 7 days). An Elecometer 211 permanent magnetic banana gauge or electronic electromagnetic type may be used. Ensure primer thickness is deducted from final thickness reading.
  If SprayFilm WB3 is left exposed for extended periods, it must be protected from rain and high humidity or sealed with a topcoat appropriate for the environmental conditions.

• In exposed and semi-exposed interior environments, the applied SprayFilm WB3 should be coated with a compatible finish coat, in order to give the desired colour and seal the SprayFilm WB3.
  The topcoat system must be suitable for the environment in which it is to be used, and should be a good quality, long oil alkyd, silicone, acrylic latex or polyurethane type. All topcoats should be applied in accordance with the topcoat manufacturer’s recommendations.
  Ensure that the SprayFilm WB3 is thoroughly dry before application of
  topcoat.
  Typically, allow a minimum of 7 days for the SprayFilm WB3 to fully cure before application cf any topcoat system.
  Consult Cafco International for confirmation of topcoat compatibility

• 25kg plastic pails.

• Indoors in dry conditions between 10°C and 38°C.
  Protect from frost, excessive heat and strong radiant sunlight.

• Maximum 10 months in original sealed containers.