ISO 2004:1997

This International Standard gives specifications for natural rubber latex concentrate types which are preserved wholly or in part with ammonia and which have been produced by centrifuging or creaming.

This International Standard covers requirements for centrifuged and creamed natural rubber concentrates of the following types:

• NR latex concentrate, type HA. Centrifuged latex preserved after concentration with ammonia only, with an alkalinity of at least 0,60 % (m/m) calculated with respect to the latex.
• NR latex concentrate, type LA. Centrifuged latex preserved after concentration with ammonia together with other preservative(s), with an alkalinity of not more than 0,29 % (m/m) calculated with respect to the latex.
• NR latex concentrate, type XA. Centrifuged latex preserved after concentration with ammonia together with other preservative(s), with an alkalinity of at least 0,30 % (m/m) calculated with respect to the latex.
• NR latex concentrate, type HA, creamed. Creamed latex preserved after concentration with ammonia only, with an alkalinity of at least 0,55 % (m/m) calculated with respect to the latex.
• NR latex concentrate, type LA, creamed. Creamed latex preserved after concentration with ammonia together with other preservative(s), with an alkalinity of not more than 0,35 % (m/m) calculated with respect to the latex.