GOST 24903-81
GOST 24903−81 Powder products. Method for the determination of oil (with Amendments No. 1, 2)
GOST 24903−81
Group B59
INTERSTATE STANDARD
POWDER PRODUCTS
METHOD FOR DETERMINATION OF OIL
Powder articles. Method of determination of oil
ISS 77.160
AXTU 1709
Date of introduction 1982−01−01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Academy of Sciences of the Ukrainian SSR
2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from
3. INTRODUCED FOR THE FIRST TIME
4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
| The designation of the reference document referenced |
Paragraph number section |
| GOST 4−84 |
2 |
| GOST 18321−73 |
1 |
| GOST 18898−89 |
4.1 |
5. The expiration time limit is removed by the Resolution of Gosstandart of the USSR from
6. EDITION (November 2003) with Changes No. 1, 2, approved in June 1986, August 1991 (ICS 9−86, 11−91)
This standard specifies a method for determining oil content in mass fraction more than 0.5% in the impregnated powder products.
The method is based on dissolution of the oil sample followed by extraction and determination of the difference of the mass of the sample before and after the test.
The standard fully complies ST SEV 2292−80.
(Changed edition, Rev. N 2).
1. SELECTION AND PREPARATION OF SAMPLES
A sample selected at random or by a method of maximum objectivity according to GOST 18321.
Weight of sample for test shall be from 10 to 200 g. the weight of the product is less than 10 g of a sample to form multiple products, the total mass which must be more than 10 g. the weight of products, more than 200 g crushed him to pieces. Any of the parts weighing from 10 to 200 g to take the test.
2. EQUIPMENT, REAGENTS
Laboratory scales with the greatest limit of weighing 200 g, with weighing error of no more than 0.001 g.
The to conventional Soxhlet extractions with a volume of not less than 0.25 inch(see drawing) or other devices for reliable oil extraction. Carbon tetrachloride according to GOST 4.
(Changed edition, Rev. N 1, 2).
1 — solvent; 2 — ascending vapor; 3 — extraction of the cartridge with the substance; 4 steam pipe; 5 — cooling water; 6 — concentrated solvent; 7 — solution
3. TESTING
3.1 a Sample is weighed with an error of not more than 0,001 g. carry out oil extraction from the sample in the Soxhlet apparatus for at least 3 h. the solvent used carbon tetrachloride or other solvents.
The sample is dried at a temperature of 10−20 °C above the boiling point of the solvent.
(Changed edition, Rev. N 1).
3.2 alternately Repeat the extraction and drying to constant weight of the sample. Weight considered constant if its value after the next operation of extraction is reduced by no more than 0.05%.
(Changed edition, Rev. N 2).
4. PROCESSING OF THE RESULTS
4.1. Mass fraction oil () in the sample in % is calculated by rounding up to 0.01% according to the formula
The volume fraction of oil () in the sample in % is calculated by rounding up to 0.1% by the formula
The volume fraction of the open pores, saturated with oil, in percent () is calculated with rounding to 0.1% by the formula
where — weight of sample before extraction, g;
— weight of sample after extraction, g;
— oil density, g/cm
;
— sample volume, cm
;
— the volume of the open pores, cm
.
The volume of the open pores () is determined according to GOST 18898.
4.2 in the control of products the number of definitions should be specified in the normative-technical documentation for the product.
4.3 arithmetic mean of the results of parallel measurements taken for the final result.
