NYC-WTC_000195120

NYC 9/11 Public Portal Document

ASBESTOS HAZARDTEXT ® - Hazard Management Page 2 of 3

NIOSH/RTECS CI 6478000 (Anthophyllite) NIOSH/RTECS CI 6479000 (Crocidolite; blue asbestos) NIOSH/RTECS CI 6560000 or XX 2095000 (Tremolite)

1.2.3 UN/NA NUMBER;

2212/2590 - Asbestos 2590 - Chrysotile (white asbestos) 2212 - Amosite (brown asbestos) 2590 - Anthophyllite 2212 - Crocidolite (blue asbestos) 2590 - Tremolite

1.2.5 DESIGNATIONS: NCI-C08991

1.2.6 MOLECULAR FORMULA:

UVCB Mg6(514010)(OH)8 (Chrysotile) Ca2(Mg,Fe)5(Si8O22)(OH)2 (Actinolite) Fe5Mg2(Si8O22)(0H)2 (Amosite) (Mg,Fe)7(518022)(OH)2 (Anthophyllite) Na2Fe3Fe2(518022)(OH)2 (Crocidolite) Ca2Mg5{Si8O22)(OH)2 (Tremolite)

1.2.7 ERG2000 GUIDE NUMBER:

171 - SUBSTANCES (LOW TO MODERATE HAZARD) (UN/NA 2212; UN/NA 2590)

1.3 SYNONYM REFERENCE

A. HSDB, 1999; Lewis, 1996; RTECS, 1999; Sittig, 1991

1.4 USES/FORMS/SOURCES

A. Asbestos is used in fireproof fabrics, brake linings, gaskets, roofing compositions, electrical and heat insulations, paint fillers, chemical filters, and diaphragm cells. It is also used as a reinforcing agent in rubber, plastics, and cement, as an inert filler medium, and as a component of paper dryer felts (Budavari, 1996; Lewis, 1998). B. Asbestos is a generic name for a class of naturally occurring, hydrated, fibrous silicates. In general, asbestos fibers are white, gray, green, or brown, have exceptional tensile strength, are moldable, and are relatively inert chemically. They are noncombustible in air and separate into filaments. Asbestos is divided into two groups (Budavari, 1996; ITI, 1988; Lewis, 1993, Lewis, 1998; Sittig, 1991): 1. Serpentine asbestos is the mineral chrysotile, a magnesium silicate, with strong, flexible fibers. It is possible to spin the longer serpentine fibers. Serpentine or chrysotile asbestos (white asbestos) is the most common form of asbestos. 2. Amphibole asbestos includes various silicates of magnesium, iron, calcium, and sodium. The fibers of this group are generally brittle and cannot be spun, but they are more resistant to chemicals and heat than serpentine asbestos. Subdivisions of amphibole

http://www.tomescps.com/DATA/DT/DT356-l.htm 1/4/2002

CITY_21MC100_012170687

NYC-WTC_000195121