Rule 14 Use of small quantities of di-isocyanates, or organic plasticisers
The discharge of contaminants into air in connection with any process involving:
(1)the use of substances containing di-isocyanates or organic plasticisers at a rate of less than 10 litres (or10 kg) per day and also at a rate of less than 3 litres (or 3 kg) per hour;
is a Permitted Activity, provided the activity complies with the conditions below.
The person responsible for the activity shall ensure that:
(i)there is no discharge of particulates of a concentration greater than 250 mg/m (at STP), measured at the point of discharge;
(ii)no contaminant is discharged from the process, that is noxious, dangerous, offensive, or objectionable at or beyond the boundary of the property; and
(iii)for coating processes undertaken indoors, the discharge of contaminants to air is vented with an unimpeded vertical flow, through a chimney(s) or vent(s) which terminates at least three metres above the level of any adjacent area to which there is general access (i.e., ground level, roof areas or adjacent openable windows) and as far as practicable from any boundary with a residential property.
Explanation: Rule 14 relates to discharges to air from processes involving the use of substances containing di-isocyanates and organic plasticisers. Rule 15 permits discharges to air associated with the use of less than 10 litres (or 10 kg) per day and also less than 3 litres (or 3 kg) per hour of substances containing di-isocyanates or organic plasticisers, subject to compliance with the stated conditions. The use of 10 litres (or 10 kg) or more per day or 3 litres (or 3 kg) or more per hour of these substances is a discretionary activity covered by Rule 23.
Di-isocyanates are used in the production of polyurethane materials. In New Zealand, the manufacture of flexible and rigid polyurethane foam accounts for the bulk of isocyanate use. Use of polyurethane paints and lacquers also involves significant amounts of di-isocyanate. Other products using isocyanates are urethane rubbers, adhesives and binders. Plasticisers determine the flexibility of plastics. For example, plastic bags contain a high proportion of plasticisers whereas a plastic pen contains a relatively small amount of plasticiser.
The conditions in Rule 14 require that there is no discharge of particulates of a concentration greater than 250 mg/m 3 (at STP), measured at the point of discharge, and that there are no noxious, dangerous, offensive, or objectionable discharges.