Cafco BLAZESHIELD® II is a spray applied single package factory controlled premix, based on a mixture of mineral wool and cement binders. It is designed primarily for interior application.

Cafco BLAZESHIELD® II will not crack or spall under conditions of normally expected structural movement or where deflection is within 1/250 of the span. It will also resist dusting and erosion due to high velocity air movement in plenum chambers.

Cafco BLAZESHIELD® II is used as a fire protective application to steel and concrete frames, metal decks and return air plenums. It can be sprayed around an complex shape.

Commercial projects or varying size and scale benefit from the use of versatile Cafco BLAZESHIELD® II.

Advantages

	Durable, lightweight coating offers fire protection up to 240 minutes.
	Very effective thermal insulation, particularly when applied to underside of floors.
	Acoustically efficient sound absorbing material.

Fire Protection Thickness

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

All column and beam sections have their own specific Hp/A ratio. Please consult Promat to establish the Hp/A ratio for a particular beam or column section. Tables 1 and 2 ascertain the thickness of Cafco BLAZESHIELD® II that meets the required period of fire resistance for I section beams and H section columns.

These tables show the thickness requirements for Cafco BLAZESHIELD® II under British testing standards. Thickness requirements under other testing standards are available upon request from Promat.

For advice on thickness calculations for hollow sections, cellular beams, castellated sections, composite floors, upgrading of concrete slabs and more complex situations, please contact Promat.

Sound Insulation Thickness
Cafco BLAZESHIELD® II is extensively tested and used as a medium for absorbing sound. It is spray applied and thus presents a monolithic surface which enhances its acoustic properties.

The noise reduction coefficient (NRC) is the average absorption of sound in the 250-2000 Hertz (Hz) range. However, in Table 3, data is also provided for 125 Hz as this represents the pitch of the average male voice and has relevance to office design.

Properties and performance
Colour and finish	Off-white textured surface. May be tamped/cuffed or rolled for a smoother finish or over sprayed with a recommended hard setting finish.
Theoretical coverage	210m²/tonne at 18mm thickness
Cure	By hydraulic set
Initial set	2 to 6 hours at 20°C and 50% RH
Density	264kg/m³ ± 15%
Bond impact	No cracks or delaminations
Air erosion resistance	No erosion
Deflection effect	No cracks or delaminations within normal code limits
Cohesion/adhesion	19.1kPa
Combustibility	Non combustible
Smoke generation	Does not contribute to smoke generation
Thermal conductivity	0.043 W/mK at 24°C
pH value	9.5
Sound absorption	Noise reduction coefficient (NRC) 0.75
Fire resistance	Structures protected with Cafco BLAZESHIELD® II have undergone fire resistance tests in approved independent laboratories to recognised standards throughout the world, including: UK (BS476: Part 20-21: 1987)   France (August 1999 Ministry Decree) Belgium (NBN S21-202) USA (ASTM E119) The fire resistance test results relate solely to the constructions tested and test conditions imposed. Promat provides computer based thickness calculations to meet specific fire resistance on receipt of project details.

Please consult nearest Promat office for specific details related to local, prevalent conditions.

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