# The Fishing Vessels (Safety Provisions) Rules 1975, Paragraph 5


Every such kapok lifejacket shall, in addition to complying with the requirements of paragraph 1 to 4 of this Part of this Schedule, comply with the following requirements:—
(a) it shall contain not less than 1 kilogramme of kapok;
(b) the kapok shall be of good flotation quality, well teased, evenly packed and free from seeds and other foreign matter;
(c) the kapok shall be protected from the effects of oil or oil products so that the loss of buoyancy in the lifejacket, after floating in disturbed water containing a layer of not less than 3 millimetres in depth of a mixture of gas oil for a period of 48 hours, shall not exceed 2 per cent of the initial buoyancy and for the purpose of this test the lifejacket shall be loaded with weights equal to half its initial buoyancy; and
(d) the covering shall be of pre-shrunk cotton material or a suitable synthetic material the weight of which in loom state per linear yard shall be not less than 170 grammes for a width of 685 millimetres and in proportion for other widths. The fabric shall be free from admixture of sizing or other foreign matter. The threads per inch in loomstate shall be warp 44 two-fold threads and weft 34 two-fold threads. The sewing shall be carried out with linen thread of not less quality than 25a fine cord Whittemore Cord.

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Source: https://www.legislation.gov.uk/uksi/1975/330/schedule/11/paragraph/5 (the official version)
Page: https://openlegislation.uk/fishing-vessels-safety-provisions-rules-1975/schedule-11/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.