ISO 4660-2020 pdf free

04-24-2021 comment

ISO 4660-2020 pdf free.Rubber, raw natural — Colour indextest.
This document specifies two methods to determine the colour of raw natural rubber according to astandard colour scale:
– Method A: colour matching against standard coloured glasses;- Method B: colour determination using colour spectrophotometer.In case of dispute, the preferred method is Method B.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies.ISO 2393,Rubber test mixes — Preparation, mixing and vulcanization —Equipment and procedures.
No terms and definitions are listed in this document.
The raw rubber is prepared in the form of a moulded disc of specified thickness.
For Method A, the colour of this disc is compared and matched as closely as possible with that ofstandard glasses. Colour matching is carried out under diffuse daylight illumination against a mattwhite background, preferably by use of a comparator which suitably locates and shrouds the test pieceand standard glass.For Method B, the colour of the test piece is compared and matched automatically using a colourspectrophotometer.
Annex A gives additional information on comparison study between Method A and Method B.
Mould, of stainless steel or aluminium, 1,6 mm ± 0,05 mm thick, having cavities approximately14 mm in diameter with two mould covers of similar material, 1 mm to 2 mm thick. A suitable mould isillustrated in Figure 1.
Platen press, capable of applying a pressure of not less than 3,5 MPa over the platen surfaces andmaintaining platen temperatures of 150C± 3 °C.Platens with lateral dimensions of 200 mm × 200 mmare suitable.
The purpose of the punch is to produce test pieces of approximately constant volume quickly andwithout difficulty.The punch shall consist of a flat-ended cylindrical anvil and a coaxial tubular knife moving independently of one another; a single action of the handle shall compress a portion of thematerial to a thickness of 3,4 mm 0,2 mm and shall cut a disc of approximately 13 mm diameter.
Standard coloured glasses, conforming to the requirements of Table 1 (colour index scale: 1 to5 units in half-unit steps and 5 to 16units in unit steps).The standard glasses are produced according tothe intensity of amber colour to provide a colour index scale in which the higher index values correspondto darker colours.ISO 4660 pdf download.

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