Paragraph 19
At an installation where—
(a)
toluene di-isocyanate or other di-isocyanate of comparable volatility or, where partly polymerised, partly polymerised di-isocyanates or prepolymers of those monomers is used, and
(b)
where the use of any of the chemicals described in sub-paragraph (a) may result in a release into the air which contains such a di-isocyanate monomer,
the eligible processes are any such use.