BS EN ISO 4630:2015 pdf free
BS EN ISO 4630:2015 pdf free.Clear liquids一Estimation of colour by the Gardner colour scale
BS EN ISO 4630 specifies a method for estimating the colour of optically clear,yellow/ brownish coloured liquid products by means of the Gardner colour scale using colour-measuring instruments. The method uses the Gardner colour scale described in Annex A.
It is applicable to drying oils, varnishes and solutions of fatty acids, polymerized fatty acids, resins, tall oil, tall oil fatty acids, rosin and related products. The results might be invalid if other products are tested.
The method described provides a more precise way of measuring Gardner colour than a visual sample comparison using human eyes. It is applicable to products having colours from Gardner 1 to Gardner 18.
The Gardner scale is not applicable to products with colours darker than 18. For products with colours lighter than Gardner 1 the method specified in ISO 6271 applies.
The following referenced documents, in whole or in part, are normally referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3696, Water for analytical laboratory use一Specification and test methods
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results一Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
ISO 13632, Binders for paints and varnishes 一Rosin 一Sampling and sample preparation for colour measurement
ISO 15528, Paints, varnishes and raw materials for paints and varnishes一Sampling CIE Publication No. 15:2004, Colorimetry
Baseline calibration of the instrument shall be performed following the instrument manufacturer’s recommendations.
If the material to be tested is cloudy, first filter it (see Note). Then, using the same type of glass tube or absorption cell as used for the baseline calibration, fill the glass tube or absorption cell with the product. Take care not to touch the measurement area of the glass tube or absorption cell.
If the material shows any visual haziness, remove the haze e.g. by filtration, centrifugation, heating,ultrasonic treatment or any other suitable means (see Note).
If the haziness cannot be removed, the measured value will be unreliable.
Then, using the same type of glass tube or absorption cell as used for the baseline calibration, fill the glass tube or absorption cell with the product. Take care not to touch the measurement area of the glass tube or absorption cell.
Avoid creating air bubbles when filling the glass tube or absorption cell. If air bubbles are formed and remain trapped, remove them by heating, vacuum, ultrasonic treatment or any other suitable means (see Note).BS EN ISO 4630 pdf download.
