GENEQ > Essais sur Matériaux > Jauges de mesure
| Jauge de mesure de la finesse du broyage |
| Modèle 501/100 de Sheen Inst. |
| The Fineness of
Grind Gauge is used for the determination of the wet film thickness at
which the size of the pigment just exceeds the film thickness. |
| • Grinding is expensive – use the gauge
to determine minimum grinding time |
| The term “Hegman” is sometimes applied as a
generic description to these gauges and, in spite of National and International
specifications recommending the adoption of the micron (um) scale, arbitrary
scales such as Hegman, North, FSPT. etc., are sometimes wanted. Each gauge consists of a block of hardened stainless steel with dimensions of: 175mm x 63mm x 13mm with either a single or double channel of 12.5mm width and supplied with a scraper blade. |
| Size ranges: 0-25um, 0-50um, 0-100um. |
| ALL OUR GAUGES ARE MADE FROM HIGH QUALITY STAINLESS STEEL |
| METHOD OF USE |
| Reference should be made to the current editions
of British Standards 3900 Part C6, International Standard ISO 1524, ASTM-D 1210 Standard and other National Standards for details of the test method. The term ‘fineness of grind’ is defined as the reading obtained on a gauge under specified conditions of test and the reading indicates the depth of the gauge at which discrete solid particles are readily discernible. The selected gauge should be clean and dry and placed on a flat surface. A small sample of the test material is poured into the deep end of the groove, then with the scraper blade held at right angles to the gauge with both hands, it is scraped at a steady rate down the length of the gauge. Sufficient downward pressure should be exerted on the scraper to clean the level surface of the gauge but leaving the channel filled with material. Immediately after draw down determine the fineness-of-grind by viewing the gauge, at right angle to its length, at a grazing angle. Observe the point along the channel where the material first shows a predominantly speckled appearance and note the graduation marks between which the number of particles, in a band 3mm wide across the groove, is in the order of 5 to 10. Report the higher graduation figure as the fineness-of-grind, disregarding any scattered specks which may appear above the band where the speckles appearance begins. Clean the gauge immediately after use. |
| REF. 504 CLEANLINESS GAUGE |
| This instrument is basically the same as the Fineness of Grind Gauge but the channel is much wider (37mm). This wide channel enables foreign particles e.g. pieces of paint ‘skin’, agglomerates, fibres or other stray matter to be shown more readily, whilst the fineness of grind may be read in the usual way. The ranges available are the same as fineness of grind gauges i.e. 0-25 microns, 0-50 microns, & 0-100 microns. |
| METHOD OF USE As for Fineness-of-Grind Gauges. |
| ORDERING INFORMATION Ref.501 - Double channel gauge Ref.501/25: 0-25mm; 501/50: 0-50mm; 501/100: 0-100mm Ref.502 - Single channel gauge Ref.502/25: 0-25mm; 502/50: 0-50mm; 502/100: 0-100mm Ref.504 - Wide channel gauge Ref.504/25: 0-25mm; 504/50: 0-50mm; 504/100: 0-100mm Ref.505 - Spare scraper blade for any above. |
| Please use the appropriate reference numbers and state the range required. Standard gauges are engraved with micron and Hegman scales. State if other scales are required instead, i.e. “Ref. 501, 0-50mm, engraved microns and mils.” Gauges are supplied with a scraper blade. |
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