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SN/T 0803.6-1999 English PDF (SNT0803.6-1999)

SN/T 0803.6-1999 English PDF (SNT0803.6-1999)

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SN/T 0803.6-1999: Oil bearing materials for import and export. Method for the inspection of impurities

This standard specifies the inspection methods for impurities in oil bearing materials for import and export. This standard applies to the inspection for impurities in oil bearing materials for import and export.
SN/T 0803.6-1999
SN
ENTRY-EXIT INSPECTION AND QUARANTINE STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
Replacing ZB B33009-1987
Oil bearing materials for import and export -
Method for the inspection of impurities
ISSUED ON: DECEMBER 01, 1999
IMPLEMENTED ON: MAY 01, 2000
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Definition ... 4
4 Sampling and sample preparation ... 4
5 Inspection method ... 4
Appendix A (Normative) Sample size for impurity inspection of oil bearing materials ... 8
Appendix B (Normative) Screen specifications for impurity inspection of oil bearing materials ... 9
Oil bearing materials for import and export -
Method for the inspection of impurities
1 Scope
This standard specifies the inspection methods for impurities in oil bearing materials for import and export.
This standard applies to the inspection for impurities in oil bearing materials for import and export.
2 Normative references
The clauses contained in the following standards constitute the clauses of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards will be revised; all parties using this standard shall explore the possibility of using the latest version of the following standards. SN/T 0798-1999 Inspection of cereals oils and feedstuffs for import and export - Terminology for inspection
SN/T 0800.1-1999 Inspection of cereals oils and feedstuffs for import and export - Methods of sampling and preparation of samples
3 Definition
This standard adopts the definition in SN/T 0798.
4 Sampling and sample preparation
This standard adopts the method in SN/T 0800.1.
5 Inspection method
5.1 Instruments and utensils
5.1.1 Balance: Sensitivity 0.1, 0.01 g.
5.1.2 Electric screening machine.
5.1.3 Round-hole selection sieve: Sieve diameter 1.0, 1.2, 2.0, 3.0 mm; with sieve bottom and sieve cover.
5.1.4 Sample trays, small dishes, scalpels, magnifying lens, tweezers, brushes, etc.
5.2 Screening
Put the required sieves on the bottom of the sieve in the order of aperture from small to large; pour an appropriate amount of specimen into the center of the top sieve; cover the sieve.
5.2.1 Hand screen
Place the round-hole screen on a glass plate or a smooth table. Use both hands to screen clockwise and counterclockwise for 1 min at a speed of (110 ~ 120) times/min. The screen amplitude is the screening diameter plus (8 ~ 10) cm expanded diameter.
5.2.2 Machine screen
Use an electric screening machine to rotate at a speed of (110 ~ 120) times/min, with 1/2 of the screening radius as the screen amplitude; perform screening for 2 min.
5.3 Large sample impurity inspection
5.3.1 Operation method
Prepare an average sample according to Chapter 4. According to the categories of large, medium, small oil bearing materials, use a sample divider or quartering method to take samples for bulk impurity inspection. The sample size is as shown in Appendix A (Normative). Weigh it on a balance which has a sensitivity of 0.1 g. According to the categories of the oil bearing materials, pour it into the specified round-hole screen in several times (not exceeding 250 g each time). See Appendix B (Normative) for the selection of screen specifications. Perform screening according to 5.2. After the screening, gently remove the screen; pour the material above the screen into the sample pan. Merge the stuff in the sieve hole into the sample above the screen. Pour out the material below the screen from the bottom pan. Use a brush to clean the dust which attaches to the bottom pan. Include it into the material below the screen. Use tweezers to pick out large impurities. Combine them with the material below the screen. Weigh them on a balance which has a sensitivity of 0.01 g.
5.3.2 Calculation of results
Calculate the percentage of impurities in the large-sized sample according to

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