A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Smoke suppression in PVC plenum cable jackets
To reduce the potential of flame and smoke propagation in air plenum cavities, plenum rated communication cable must meet stringent standards established by the National Fire Protection Association (NFPA). These standards are based on NFPA 262. Although no single small-scale lab test has proven to be a predictor of NFPA 262, laboratory tests can provide guidance in developing successful formulations and insight into the mechanism of flame and smoke control. To meet the NFPA 262 standard, PVC jacket compound requires the use of various flame retardant and smoke suppressant additives. Typically, smoke suppressant additives are based on molybdate chemistry, which promotes the formation of a protective char layer. The authors compare the performance of various molybdate additives in several different flexible PVC formulas. Zinc molybdate lowers the temperature at which char is formed in PVC. While this may partially account for the mechanism of smoke suppression, it can also result in diminished thermal stability. However, it has also been shown that zinc molybdate/magnesiurn hydroxide complex can promote the formation of a thermally stable char without affecting the onset temperature of char formation. As a result, smoke suppressants based on this chemistry should provide smoke suppression without sacrificing thermal stability. The optimum use level depends both on the chemistry of the smoke suppressant and the system used. Smoke suppressants based on zinc molybdate can have an optimum use level lower than that of ammonium molybdate.Testing was conducted using the cone calorimeter, NBS smoke chamber and thermo-chemical techniques. Strategies to achieve low smoke performance without sacrificing dynamic stability are also presented.
Smoke suppression in PVC plenum cable jackets
To reduce the potential of flame and smoke propagation in air plenum cavities, plenum rated communication cable must meet stringent standards established by the National Fire Protection Association (NFPA). These standards are based on NFPA 262. Although no single small-scale lab test has proven to be a predictor of NFPA 262, laboratory tests can provide guidance in developing successful formulations and insight into the mechanism of flame and smoke control. To meet the NFPA 262 standard, PVC jacket compound requires the use of various flame retardant and smoke suppressant additives. Typically, smoke suppressant additives are based on molybdate chemistry, which promotes the formation of a protective char layer. The authors compare the performance of various molybdate additives in several different flexible PVC formulas. Zinc molybdate lowers the temperature at which char is formed in PVC. While this may partially account for the mechanism of smoke suppression, it can also result in diminished thermal stability. However, it has also been shown that zinc molybdate/magnesiurn hydroxide complex can promote the formation of a thermally stable char without affecting the onset temperature of char formation. As a result, smoke suppressants based on this chemistry should provide smoke suppression without sacrificing thermal stability. The optimum use level depends both on the chemistry of the smoke suppressant and the system used. Smoke suppressants based on zinc molybdate can have an optimum use level lower than that of ammonium molybdate.Testing was conducted using the cone calorimeter, NBS smoke chamber and thermo-chemical techniques. Strategies to achieve low smoke performance without sacrificing dynamic stability are also presented.
Smoke suppression in PVC plenum cable jackets
Walker, J. Ken (author) / Ho, Wai-Kwong (author) / Mittleman, Martin L. (author)
2005
6 Seiten, 4 Bilder, 7 Tabellen, 4 Quellen
Conference paper
English
Initial investigations on plenum cable fires
| Tema Archive | 2002
Taylor & Francis Verlag | 1987
| British Library Online Contents | 1999
Initial Investigations on Plenum Cable Fires (RP-1108)
| British Library Online Contents | 2001
Initial Investigations on Plenum Cable Fires (RP-1108)
| British Library Conference Proceedings | 2002