CAFCOTHERM® - Mineral Wool Cement Mix Spray
INTRODUCTION
CAFCOTHERM® is a dry spray applied, single pack factory controlled premix, based on a mixture of mineral wool and cement binders, for internal use or when protected from direct exposure to the weather.
CAFCOTHERM® is used for application on steel and concrete frames, concrete soffits, metal decks and return air plenums.
The application of CAFCOTHERM® provides and economical and joint-free barrier to thermal transmission and offers excellent sound absorption. Building types that will benefit from the use of CAFCOTHERM® include a wide range of educational, leisure and entertainment centres or commercial projects, including the thermal insulation of ground floor car parks.
| Properties and performance |
| Colour and finish |
Off-white. Surface can be textured or tamped |
| Minimum practical thickness |
10mm |
| Theoretical coverage |
103m2/tonne at 65mm thickness |
| Number of coats |
One or more as required |
| Cure |
By hydraulic set |
| Initial set |
6 to 8 hours at 20°C and 50% RH |
| Density |
200kg/m3 ± 15% for fire resistance and sound absorption
145kg/m3 ± 15% for thermal insulation
|
| Combustibility |
Non-combustible to BS476: Part 4: 1970 |
| Flame spread |
Class 0 as defined by the Building Regulations |
| Thermal conductivity |
0.036W/mK at a density of 145kg/m3 |
| Smoke generation |
Does not contribute to smoke generation |
| pH value |
12.0 - 12.5 |
| Sound absorption |
Noise reduction coefficient (NRC) 0.85, see TABLE 2 |
| Fire resistance |
Structures protected with CAFCOTHERM® have been assessed for up to 120 minutes fire resistance as defined in BS476: Part 8 for cellulosic fires
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 ratings on receipt of beam and column section details
|
ADVANTAGES
Durable, lightweight coating that offers combined thermal and acoustic properties in addition to fire protection. Can be sprayed around any complex shape.
FIRE PROTECTION THICKNESS
The thickness of the fire protection for a given period of fire resistance in a cellulosic type fire, relates to the A/V ratio of the section. A/V 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 A/V ratio. Please consult Promat to establish the A/V ratio for a particular beam or column section. Use TABLE 1 ascertain the thickness of CAFCOTHERM® that meets the required period of fire resistance.
TABLE 1 CAFCOTHEM® thicknesses for I-section beams (3-sided exposure). Critical temperature 550ºC.
| A/V |
Thickness for the required fire resistance |
| 30 min |
60 min |
90 min |
120 min |
| 30 |
13mm |
13mm |
13mm |
17mm |
| 50 |
13mm |
13mm |
13mm |
18mm |
| 70 |
13mm |
13mm |
13mm |
25mm |
| 90 |
13mm |
13mm |
16mm |
35mm |
| 110 |
13mm |
13mm |
22mm |
40mm |
| 130 |
13mm |
13mm |
26mm |
42mm |
| 150 |
13mm |
13mm |
27mm |
43mm |
| 170 |
13mm |
13mm |
29mm |
44mm |
| 190 |
13mm |
13mm |
31mm |
46mm |
| 210 |
13mm |
14mm |
35mm |
46mm |
| 230 |
13mm |
16mm |
35mm |
47mm |
| 250 |
13mm |
17mm |
36mm |
47mm |
| 270 |
13mm |
18mm |
36mm |
48mm |
| 290 |
13mm |
20mm |
39mm |
49mm |
| 310 |
13mm |
21mm |
42mm |
52mm |
SOUND INSULATION THICKNESS
CAFCOTHERM® has been extensively tested and used as a medium for absorbing sound, and being spray applied presents a monolithic surface. The noise reduction coefficient (NRC) is the average absorption of sound in the 250-2000 Hertz (Hz) range. In TABLE 2, figures are also given for 125 Hz as this represents the pitch of the average male voice and has relevance to office design.
TABLE 2 CAFCOTHERM® thicknesses at density of 200kg/m3 and sound absorption
| Thickness |
Substrate |
Air void below substrate |
Frequency |
NRC rating |
| 125 Hz |
250 Hz |
500 Hz |
1000 Hz |
2000 Hz |
4000 Hz |
| Absorption coefficient |
| 10mm |
Solid |
- |
0.08 |
0.19 |
0.37 |
0.61 |
0.79 |
0.78 |
0.50 |
| 13mm |
Solid |
41mm |
0.38 |
0.20 |
0.57 |
0.73 |
0.75 |
0.74 |
0.60 |
| 19mm |
Metal lath |
41mm |
0.49 |
0.65 |
0.88 |
0.93 |
0.90 |
0.87 |
0.85 |
| 25mm |
Solid |
41mm |
0.59 |
0.50 |
0.71 |
0.91 |
0.91 |
0.88 |
0.75 |
| 25mm* |
Solid |
– |
0.06 |
0.24 |
0.78 |
0.95 |
0.93 |
0.97 |
0.72 |
*All thicknesses are established by Western Electro Acoustic except 25mm established by University of Salford.
THERMAL INSULATION THICKNESS
The thermal insulation requirement for a building can be expressed as a U-value. Part L of the Building Regulations provides guidance according to building type.
Promat is able to calculate the thickness of CAFCOTHERM® required in order to achieve the specified U-value of a construction. In order to do so this the following information is required:
- Specified U-value to be achieved.
- Detailed section showing the build up of the construction to be insulated.
- Please consult Promat Technical Department for further information.
| Preparation |
| Typical substrates |
Concrete soffits, metal decks, steel and concrete structural frames, and return air plenums |
| Substrate preparation |
The substrate shall be clean, dry and free from dust, loose millscale, loose rust, oil and any other conditions preventing good adhesion
All surfaces should be prepared by the application of Cafco BONDSEAL®
|
| Application |
| Initial steps |
Application of CAFCOTHERM® must be carried out by an applicator recognised by Promat and applied in accordance with the installation guide available from Promat |
| Methods |
CAFCOTHERM® is mixed with potable water at the nozzle of a spraying machine approved by Promat
|
| Limitations |
CAFCOTHERM® may be applied when the substrate and air temperatures are at least 4ºC and rising, and must be maintained for 24 hours before, during and 24 hours after application. Maximum substrate and air temperature is 45ºC
Substrate temperature should be at least 2ºC above dew point temperature
|
QUALITY ASSURANCE
Promat operates a quality system in accordance with BS EN ISO 9001: 2000 and has received full accreditation to these standards.
Operating to these standards means that all activities, which have a bearing upon quality, are set out in written procedures. Systematic and thorough checks are made on all materials and their usage. Test equipment is subjected to regular checks and is referred back to national standards.
The information given in this data sheet is based on actual tests and is believed to be typical of the product. No guarantee of results is implied however, since conditions of use are beyond our control.
HEALTH AND SAFETY
Adequate ventilation must be provided during use. Avoid contact with the skin and eyes by using eye protection, gloves, barrier cream and a face mask.
If the product comes into contact with the skin, wash immediately with soap and water. If the eyes are affected, flush with plenty of water and seek medical attention immediately.
A safety data sheet is available from Promat upon request.
Promat activities are conducted with due regard to all statutory requirements with appropriate safeguards against exposing employees and the public to health and safety risks.
PACKAGING
20kg bags.
STORAGE
Above ground and kept dry.
SHELF LIFE
Maximum 12 months.
ENVIRONMENTAL
Do not discharge into drains, watercourses or soil.