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| AEROFLEX, Closed Cell Thermal Insulation Materials. |
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In tropical countries,
many big buildings installed with central Air Conditioning Systems often
experience a lot of problem caused by damaged insulations. This is because
some insulations are not suitable for insulating chilled water pipes and
do not last as long as they are expected to; thus giving rise to condensation
and loss of energy problems. |
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| Comparision & Structure of Various Thermal Insulations Used in Air-conditioning Systems |
| OPEN
CELL INSULATION This fibrous insulation usually contains air pockets which are open to each other. Water and vapor can easily be absorbed or penetrate into the insulation because of the fibrous structure. If this kind of insulation is used to insulate cold surface pipes, moisture and water can be easily absorbed into the air gaps of the insulation. This can damage the insulation easily. Vapor barrier must be used and great care must be taken during installation because any areas unprotected by vapor barrier or any torn areas will absorb vapor, and lead to quick deterioration of the insulation. This kind of insulation includes Glass Fibre, Rock Wool and Calcium Silicate. |
| Fiber Glass
* SEM. X 50 |
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| INTERCONNECTING
CELL INSULATION This kind of insulation is produced by compressing small foam beads together. Penetration of moisture and vapor into the insulation is more difficult than Open Cell Insulation. The degree of penetration depends on the degree of insulation. If the insulation is more compact, the density will be higher and penetration of water vapor will be lower. However, this kind of insulation must be coated with vapor barrier material such as Bitumen or Jacketing. Because of its rigid characteristic, installation is more difficult. Sometimes the coated material can be damaged due to the shrinkage of the insulation. Condensation can result easily if the installation is not done properly. This kind of insulation includes Polystyrene foam and cork. |
| POLYSTYRENE
FOAM (PS. FOAM) * SEM. X 7 |
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| SEMI
- OPEN CELL INSULATION This kind of insulation contains a lot of tiny independent cells. Most cells are not perfectly closed, so its water absorption is more than 10% by weight. This kind of insulation includes Polyurethane Foam, Polyurethylene Foam and Phenolic Foam which have low density of 1-3 lb/ft3 or 16-48 kg/cubic m. The rigidity of the material and thin wall structure enables the insulation to deteriorate easily, therefore water absorption and water vapour penetration is quite high. This kind of insulation is more difficult to install and provides shorter service life. |
| POLYURETHANE
FOAM (PS. FOAM) * SEM. X 30 |
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| CLOSED
CELL INSULATION This kind of insulation contains is produced from Crosslinked Elastomeric Material Material that contains many complete independent because of the highly elastic material (elastomer) used. The water absorption is lower than 5% (tested by ASTMD 1056). This kind of insulation has the lowest water penetration or transmission when compared with above thermal insulations. The thermal conductivity of this insulation is very stable even after a long period of service. Closed cell insulation is the most ideal thermal insulation for chilled water pipes of Central Cooling Systems. |
| POLYURETHANE
FOAM (PS. FOAM) * SEM. X 30 |
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| Aeroflex complies with ASTM Standard. | ||||
| ASTM D 1667 | ASTM D 1056 | ASTMD 1171 | JIS K 6911 | DIN 52 613 |
| ASTM D 1693-74 | ASTM D 177 | ASTM C 355 | JIS A 1412-1989 | DIN 52 615 |
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