The National Fire Protection Association (NFPA) has ratings known as Standard 704 for flammable and hazardous substances. A detailed description of the ratings may be found here.
In addition, the NFPA Code 430 has classifications for oxidizers mostly relating to their storage requirements (see this link and this link).
The following are the ratings for chlorine products used in pools (see this link for oxidizer ratings).
CHLORINE TYPE ..... HEALTH ..... FLAMMABILITY ..... REACTIVITY ..... OXIDIZER
..... Trichlor ................ 2 .....................0 ....................... 2.................Class 1
Dichlor (dihydrate) ...... 2 .................... 0 ...................... 1 ............... Class 1
Dichlor (anhydrous) .... 2 .................... 0 ....................... 2 ............... Class 3
Calcium Hypochlorite . 3 .................... 0 ....................... 1 ............... Class 2 (<=50% concentration), Class 3 (>50% concentration)
Lithium Hypochlorite .. 3 .................... 0 ....................... 1 ............... Class 1 (<=39% Avail. Chlorine), Class 2 (>39% Avail. Chlorine)
Sodium Hypochlorite .. 2 .................... 0 ....................... 1 ........... not an oxidizer (<=12.5% concentration; see this link)
Remember that the above is for the concentrated form of these chemicals, not for their very diluted use in pools and spas. The only real controversy over the years has been with fires associated with storage of high concentrations of Cal-Hypo. None of the chlorine products are flammable in the sense that temperature alone does not ignite the products, but the higher classes of oxidizer can self-sustain their burning once they get started by having the oxidizer come in contact with other substances such as organics (oils).
Richard
In addition, the NFPA Code 430 has classifications for oxidizers mostly relating to their storage requirements (see this link and this link).
The following are the ratings for chlorine products used in pools (see this link for oxidizer ratings).
CHLORINE TYPE ..... HEALTH ..... FLAMMABILITY ..... REACTIVITY ..... OXIDIZER
..... Trichlor ................ 2 .....................0 ....................... 2.................Class 1
Dichlor (dihydrate) ...... 2 .................... 0 ...................... 1 ............... Class 1
Dichlor (anhydrous) .... 2 .................... 0 ....................... 2 ............... Class 3
Calcium Hypochlorite . 3 .................... 0 ....................... 1 ............... Class 2 (<=50% concentration), Class 3 (>50% concentration)
Lithium Hypochlorite .. 3 .................... 0 ....................... 1 ............... Class 1 (<=39% Avail. Chlorine), Class 2 (>39% Avail. Chlorine)
Sodium Hypochlorite .. 2 .................... 0 ....................... 1 ........... not an oxidizer (<=12.5% concentration; see this link)
Remember that the above is for the concentrated form of these chemicals, not for their very diluted use in pools and spas. The only real controversy over the years has been with fires associated with storage of high concentrations of Cal-Hypo. None of the chlorine products are flammable in the sense that temperature alone does not ignite the products, but the higher classes of oxidizer can self-sustain their burning once they get started by having the oxidizer come in contact with other substances such as organics (oils).
Richard