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Controlled Products Regulations

Version of section 44 from 2006-03-22 to 2015-02-10:


 For the purpose of establishing that a product, material or substance falls into Division 1 of Class D — Poisonous and Infectious Material, an LC50 that is obtained in an animal assay at an exposure duration of other than four hours may be converted to an LC50 equivalent to an exposure duration of four hours by using the following formulae:

  • (a) for a gas or vapour,

    LC50 at Y hours × (Y hours)½ ÷ 2 = LC50 at 4 hours; and

  • (b) for dust, mist or fume,

    LC50 at Y hours × (Y hours) ÷ 4 = LC50 at 4 hours.

    Note: Y = actual number of hours of exposure duration.


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