Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:1:p37
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 1 (pt 37/43)
Character Range: 244206–247496

of approval a set of samples will be considered satisfactory if one of the following conditions is met:

              7.2.1.1. All samples give a satisfactory result.

              7.2.1.2. One sample having given an unsatisfactory result a second set of samples gives satisfactory results.

              8. Resistance to chemicals

              8.1. Indices of difficulty and test method

               The requirements of Annex 3, paragraph 11.2.1., shall apply.

              8.2. Interpretation of results

               A set of samples shall be considered acceptable if one of the following conditions is met:

              8.2.1. All samples give satisfactory results.

              8.2.2. One sample having given an unsatisfactory result, a second set of samples gives satisfactory results.

Annex 16
  Rigid plastic multiple-glazed units
              1. Definition of type

               (Annex 16 is only valid for multiple-glazed units assembled of two panes)

               Multiple-glazed units shall be considered to belong to different types if they differ in at least one of the following principal or secondary characteristics.

              1.1. The principal characteristics are as follows:

              1.1.1. The trade names or marks,

              1.1.2. The chemical designation of the component sheets.

              1.1.3. The classification of the sheets by the manufacturer.

              1.1.4. The thickness of the component sheets.

              1.1.5. The process of window manufacture.

              1.1.6. The width of air gap between the component plastic sheets.

              1.1.7. The colouring of the plastic sheets.

              1.1.8. The nature and type of coating.

              1.2. The secondary characteristics are as follows:

              1.2.1. No secondary characteristic is involved.

              2. General

              2.1. In the case of rigid plastic double glazed units, tests will be performed on either flat test pieces or finished parts depending upon test requirements.

              2.2. The test pieces shall be freed from protecting maskings and cleaned before testing. They shall be stored for 24 hours at a temperature of 23 °C ± 2 °C and a relative humidity of 50 per cent ± 5 per cent prior to testing.

              2.3. The nominal thickness tolerance for extruded plastic products is ±10 per cent of the nominal thickness. For plastic products produced by other techniques (e.g. cast acrylic sheet), the acceptable thickness tolerance is given by the equation:

               Thickness tolerance limits (mm) = ± (0.4 + 0.1 . e)

               Where e is the sheet nominal thickness.

               Reference standard is ISO 7823/1

               NB: Where the thickness is not constant due to forming techniques, the measurement of the thickness will be at the geometric centre of the unit.

              2.4. Test carried out on rigid plastic double glazed units having a nominal width of gap e measured at the geometrical centre shall be considered to be applicable to all rigid plastic double glazed units having the same characteristics and a nominal width of gap e ± 5 mm.

               The applicant for approval may alternatively submit the sample having the largest and