BS EN 9138 pdf free download
BS EN 9138-2019 pdf free download.Abrasive grains — Sampling and splitting.
This International Standard specifies the apparatus and the method for sampling and splitting of a lot of abrasive grains, to be used in the comparative testing of uniformly produced abrasive grains.
2 Normative references
The following documents, in whole or in part, are normatively 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 6344-1, Coated abrasives — Grain size analysis — Part 1: Grain size distribution test
ISO 8486-1, Bonded abrasives — Determination and designation of grain size distribution —
Part 1: Macrogrits F4 to F220
ISO 8486-2, Bonded abrasives — Determination and designation of grain size distribution —
Part 2: Microgrits F230 to F2000
3 Apparatus
3.1 Sampling thief
3.1.1 General
The sampling thieves described in 3.1.2, 3.1.3, 3.1.4, or 3.1.5 shall be used.
The sampling thief shall be made from seamless steel tubing of inside diameter of 25 mm to 30 mm and a wall thickness of 1,5 mm to 3,0 mm. The length is depending of the packaging, but shall be 90 % at an angle of 45° of the packaging from top to bottom. The tube shall be pointed at one end. Holes shall be bored in a straight line.
Length, diameter, and hole or slot size shall fit to the packaging type and size in order to ensure representative samples.
The hole or slot sizes are depending on the grain size (see ISO 6344-1, ISO 8486-1, and ISO 8486-2) and shall be according to Table 1.
3.1.2 Sampling thief type 1 (with holes)
The sampling thief type 1 with holes shall be used for sampling from “drums” or big-bags. The sampling thief type 1 shall have a “T” handle or an equivalent handle at the other end.
Figure 1 shows an example for a sampling thief type 1.
3.1.3 Sampling thief type 2 (with one slot)
The sampling thief type 2 (with one slot) is recommended when sampling from small bags. Length of sampling device is typically 500 mm, and slot is 10 mm in width and 250 mm in length.
Figure 2 shows an example for a sampling thief type 2.
3.1.4 Sampling thief type 3 (with three to five slots)
The sampling thief type 3 (with three to five slots) is recommended when sampling from small bags.
Length of sampling device is typically 500 mm. This equipment is provided with three slots of 10 mm in width and 80 mm in length, 50 mm between slots.
Figure 3 shows an example for a sampling thief type 3.
3.1.5 Sampling thief type 4 (motor driven)
Several types of motor-driven sampling thieves are commercially available. They shall be used for compacted powders. This is to ensure representative sampling from the compacted bag. Compacted powders occur when the material has been stored for a long time or powder has been transported.BS EN 9138 pdf download.
