ADR 2017: Introdotte nuove rubriche N.A.S per le Sostanze soggette a polimerizzazione

Le sostanze soggette a polimerizzazione sono sostanze che, senza stabilizzazione, sono suscettibili di subire una reazione fortemente esotermica causando la formazione di molecole più grandi o causando la formazione di polimeri in condizioni normali durante il trasporto.

Tali sostanze sono inserite nella classe 4.1 ed individuate con i nuovi numeri ONU:

3531 SOSTANZE SOGGETTE A POLIMERIZZAZIONE, SOLIDE, STABILIZZATE, N.A.S.
3532 SOSTANZE SOGGETTE A POLIMERIZZAZIONE, LIQUIDE, STABILIZZATE, N.A.S.
3533 SOSTANZE SOGGETTE A POLIMERIZZAZIONE, SOLIDE, A TEMPERATURA CONTROLLATA, N.A.S.
3534 SOSTANZE SOGGETTE A POLIMERIZZAZIONE, LIQUIDE, A TEMPERATURA CONTROLLATA, N.A.S.

Disposizione Speciale: 386

____________

Polymerizing substances

Definitions and properties

2.2.41.1.20
Polymerizing substances are substances which, without stabilization, are liable to undergo a strongly exothermic reaction resulting in the formation of larger molecules or resulting in the formation of polymers under conditions normally encountered in carriage.

Such substances are considered to be polymerizing substances of Class 4.1 when:

(a) Their self-accelerating polymerization temperature (SAPT) is 75°C or less under the conditions (with or without chemical stabilization as offered for carriage) and in the packaging, IBC or tank in which the substance or mixture is to be carried;

(b) They exhibit a heat of reaction of more than 300 J/g;
and

(c) They do not meet any other criteria for inclusion in classes 1 to 8. A mixture meeting the criteria of a polymerizing substance shall be classified as a polymerizing substance of Class 4.1.

Temperature control requirements

2.2.41.1.21
Polymerizing substances are subject to temperature control in carriage if their self-accelerating polymerization temperature (SAPT) is:

(a) When offered for carriage in a packaging or IBC, 50°C or less in the packaging or IBC in which the substance is to be carried; or

(b) When offered for carriage in a tank, 45 °C or less in the tank in which the substance is to be carried.”.

2.2.41.3

Under “flammable solids - without subsidiary risk”, insert the following new arm:

At the end, add the following arm:

Table A 3.2

 

Attenzione: traduzione IT non ufficiale su draft ADR 2017, possibili modifiche

Working Party on the Transport of Dangerous Goods
100th session 21 April 2016 Geneva,
9-13 May 2016 Item 6 (b) of the provisional agenda

	Descrizione	Livello	Dimensione	Downloads
	ADR 2017 Preview - Polymerizing substances.pdf Polymerizing substances	Abbonati Merci Pericolose	222 kB	18

	Descrizione	Lingua	Dimensione	Downloads
	Report Working Party 100th session Geneva from 9 to 12 May 2016	EN	194 kB	950