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IS 13360-3-7 (1999): Plastics - Methods of testing, Part 3:Physical and dimensional properties, Section 7: Liquidresins - Determination of density by the pyknometer method[PCD 12: Plastics]

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IS 13360 (Part 3/Set 7) : 1999 IS0 1675 : 1965

Indian Standard

PLASTICS - METHODS OF TESTING PART 3 PHYSICAL AND DIMENSIONAL PROPERTIES

Section 7 Liquid Resins - Determination of Density by the Pyknometer Method

ICS 83.080; 17.060

0 BIS 1999

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

February 1999 Price Group 1

Methods of Test for Plastics Sectional Committee, PCD 23

NATIONAL FOREWORD

This Indian Standard ( Part 3/Set 7 ) which is identical with IS0 1675 : 1985 ‘Liquid resins- Determination of density by the Pyknometer method ‘ issued by the International Organization for Standardization ( IS0 ) was adopted by the Bureau of Indian Standards on the recommendation of Methods of Test for Plastics Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

The text of IS0 standard has been approved as suitable for publication as Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (J has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.

In reporting the results of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised)‘.

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IS 13360 ( Part 3/Set 7 ) : 1999 IS0 1675: 1985

Indian Siandard

PLASTICS - METHODS OF TESTING PART 3 PHYSICAL AND DIMENSIONAL PROPERTIES

Section 7 Liquid Resins - Determination of Density by the Pyknometer Method

1 Scope and field of application

This International Standard specifies a method for the deter- mination of the density of liquid resins using a pyknometer.

2 Definition

density; mass density : Mass divided by volume. (Definition taken from IS0 31/3.)

It may be expressed in grams per millilitre (g/ml).*

3 Principle

Determination of the mass at 23 ‘X of resin contained in a pyknometer of known volume.

NOTE - This method is easily applicable to low and medium viscosity resins. Difficulties in the procedure exist for high viscosity resins.

4 Apparatus

4.1 Pyknometer, consisting of a precision graduated flask. The height of the neck above the graduation mark shall not ex- ceed 60 mm.

The graduated volume of the pyknometer at 23 f 0.1 OC, measured by weighing the mass of distilled water contained in the pyknometer at this temperature, shall be known to within 1 part in 10 000 (see note to clause 6).

The pyknometers normally used have the characteristics given in the following table.

Volume of flesk. V

ml

loo f 0.1

50 f 0.05

Internal diameter of neck. d

mm

13 f 1

11 f 1

l 1 g/ml = 1000 kg/m3

4.2 Funnel, whose stem, the internal diameter of which shall be as large as possible, penetrates into the pyknometer exactly down to the level of the graduation mark.

4.3

4.4 23f

Balance, accurate to 0,2 mg.

Water-bath, capable of being maintained at 0.1 CC.

4.5 Fine filter paper.

4.6 Transparent conical flask, with wide neck (for example Erlenmeyer), stoppered, of capacity 200 to 600 ml.

5 Procedure

5.1 Preparation of resin

Place at least 160 g of resin in the conical flask (4.6) and inspect the contents of the flask for bubbles. If any bubbles are ob- served, allow the stoppered flask to stand long enough for all the bubbles to dissipate before or while bringing the flask and its contents to 23 f 0,l “C by immersion in the water bath (4.4).

NOTE - To accelerate the release of bubbles, especially any adjacent to the walls of the flask, disturb or detach them using a fine wire in- serted through the neck of the flask.

5.2 Measurement of density

Weigh the empty pyknometer (4.1) to the nearest 0.2 mg.

Place the pyknometer in the water-bath (4.4) and fill the pyknometer with resin using the funnel (4.2).

The following points require close attention :

a) bubbles shall not be present in the resin in the pyknometer; if bubbles form, wait for them to disappear, if necessary rubbing the walls of the pyknometer with a fine metal wire, or, better still, empty the pyknometer, clean it and refill;

IS 13360( Part3/Sec 7):lQQQ IS0 1675:1985

b) fill the pyknometer exactly to the graduation mark;

cl remove the funnel without letting its stem touch the neck of the pyknometer.

Wait at least 30 min and check that the level in the pyknometer remains at the graduation mark. If necessary, add a few more drops of resin or remove excess resin by means of fine filter paper (4.51, which may be wound around a glass rod.

Weigh the filled pyknometer to the nearest 0,2 mg.

6 Expression of results

The density at 23 OC, QD given by the equation

823 = mt - “0

V + Qa

where

ml is the apparent pyknometer at 23 OC;

m. is the apparent pyknometer at 23 OC;

Qa is the density of buoyancy correction);

expressed in grams per millilitre, is

mass, in grams, of the filled

mass, in grams, of the empty

air at 23 OC = 0,001 2 g/ml fair

V is the volume, in millilitres, of the pyknometer at 23 OC.

Give the result to three places of decimals.

NOTE - To check or determine the volume of the pyknometer at 23 T using distilled water, use the equation

m2 - m0 m2 - m0 v=__=_ Se - Qs 0,996 4

where

m2 is the apparent mass, in grams, of the pyknometer filled with distilled water at 23 T;

Q@ is the density of distilled water at 23 “C = 0,997 6 g/ml.

7 Test report

The test report shall contain the following information :

a) a reference to this International Standard:

b) complete identification of the material tested;

cl the density at 23 OC, Q~ expressed in grams per millilitre;

d) details of procedure not specified in this International Standard and any incidents likely to have influenced the results.

2

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Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Handbook’ and ‘Standards : Monthly Additions’.

This Indian Standard has been developed from Dot : No. PCD 23 ( 1568 ).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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