ASTM D4042 Test Method for Sampling and Testing for Ash and Total Iron in Steel Mill Dispersions of Rolling Oils
5. Sampling
5.1 Apparatus:
5.1.1 Disposable Plastic (Polyethylene) Sampling Bags 177 and 473 cm3 (6 and 16 oz) complete with closure wire.
5.1.2 Holding Fixture.
NOTE 2 - A plastic baby bottle holder with an open 177-cm3 (6-oz) sampling bag inserted makes a suitable holder.
5.1.3 Sampling Cup and Handle.
NOTE 3 - A hockey stick or similar formed apparatus of steel, plastic, or wood with or without a separate cup can be used to hold the holding fixture or the fixture itself can be attached to the handle (see Fig. 1).
5.2 Sampling Procedure:
5.2.1 Weigh a number of identified sample bags on an analytical balance to the nearest 0.1 mg. Record the weight of each as WB1.
5.2.2 Using a different, preweighed, identified plastic disposable sampling bag for each sample, remove samples from the mill only while the coolant is circulating and the mill running. Take samples from the same location between the second and third stand whenever possible. Fill the bag approximately two thirds full to allow for tying of the bag.
NOTE 4 - Occasionally, due to mill configuration or other reasons, it may be advisable to obtain the sample from other points in the mill system. If so, record complete details on location and time of sampling.
5.2.3 Tie and seal each sample with the wire provided in another disposable plastic sampling bag 473 cm3 (16 oz) to prevent loss of material in transit. Individual rigid plastic bottles of suitable size are also satisfactory containers for shipment and can be substituted for the outer 473-cm3 (16-oz) plastic bag.
5.2.4 Take extreme care not to soil the exterior of the sampling bag with the dispersion or any foreign material.
