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IS 15289-2 (2013): Abrasive Macrograins - Determination ofBulk Density, Part 1: Microgrits [PGD 9: Abrasives]

© BIS 2013

January 2013 Price Group 3

B U R E A U O F I N D I A N S T A N D A R D SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

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vi?k"khZ d.k — [kqyk ?kuRo Kkr djukHkkx 2 lw{e d.k

(igyk iqujh{k.k )

Indian Standard

ABRASIVE GRAINS — DETERMINATION OFBULK DENSITY

PART 2 MICROGRITS

( First Revision )

ICS 25.100.70

IS 15289 (Part 2) : 2013

ISO 9136-2 : 1999

Abrasives Sectional Committee, PGD 09

NATIONAL FOREWORD

This Indian Standard (Part 2) (First Revision) which is identical with ISO 9136-2 : 1999 ‘Abrasivegrains — Determination of bulk density — Part 2: Microgrits’ issued by the International Organizationfor Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation ofthe Abrasives Sectional Committee and approval of the Production and General Engineering DivisionCouncil.

This standard was originally published in 2003 based on ISO 9136 : 1989. First revision of thisstandard has been undertaken to align it with the latest version of ISO 9136-2 : 1999 which is publishedin two parts. Similarly, this standard is also published in two parts. Other part in this series is:

Part 1 Macrogrits

The text of ISO Standard has been approved as suitable for publication as an Indian Standard withoutdeviations. Certain terminology and conventions are, however, not identical to those used in IndianStandards. Attention is particularly drawn to the following:

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

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

In this adopted standard, reference appear to the following International Standard for which IndianStandard also exists. The corresponding Indian Standard which is to be substituted in its place islisted below along with its degree of equivalence for the edition indicated:

International Standard Corresponding Indian Standard Degree of Equivalence

ISO 9136-1 : 2004 Abrasive grains— Determination of bulk density —Part 1: Macrogrits

IS 15289 (Part 1) : 2012 Abrasivegrains — Determination of bulkdensity: Part 1 Macrogrits

Identical

For the purpose of deciding whether a particular requirement of this standard is complied with, thefinal value, observed or calculated, expressing the result of a test or analysis, shall be rounded off inaccordance with IS 2 : 1960 ‘Rules for rounding off numerical values (revised)’. The number ofsignificant places retained in the rounded off value should be the same as that of the specified valuein this standard.

1

1 Scope

This part of ISO 9136 specifies a test method for the determination of the bulk density of bonded and coated

abrasive microgrits.

2 Term and definition

For the purposes of this part of ISO 9136, the following term and definition apply.

2.1bulk densityrB

this, of a pourable abrasive grain which is poured in a certain way, is the quotient of the mass and the volume,specified in g/cm3

3 Testing equipment

The testing equipment is shown in Figure 1.

Indian Standard

ABRASIVE GRAINS — DETERMINATION OFBULK DENSITY

PART 2 MICROGRITS

( First Revision )

IS 15289 (Part 2) : 2013

ISO 9136-2 : 1999

Key

1 Overspill tray

2 Measuring cylinder

3 Shield

4 Stand

5 Funnel

6 Vibration channel

7 Vibration generator

8 Rubber feet

Metering device

Figure 1 — Equipment for the determination of bulk density of microgrits

3.1 Metering Device

The metering device1) is isolated by rubber feet, so that vibrations are not transmitted to the surroundings. The most

important components are:

a) vibration generator;

b) stainless steel funnel with a polished inner surface and the following main dimensions:

1) total height of funnel: 290 mm;

1) Metering device type DR1000/40 can be obtained from Fa. F. Kurt Retsch GmbH & Co. KG, PO Box 1554, D-42759 Haan.

This information is given for the convenience of users of this part of ISO 9136 and does not constitute an endorsement by

ISO of the product named. Equivalent products may be used if they can be shown to lead to similar results.

2

IS 15289 (Part 2) : 2013

ISO 9136-2 : 1999

2) top diameter: 190 mm;

3) inside diameter of cylindrical outlet: 28 mm;

4) height of cylindrical outlet: 38 mm;

c) stainless steel horizontal vibration channel, with the following dimensions (210 mm 3 40 mm 3 30 mm) ± 1 mm(length 3 width 3 depth). The distance from the lower edge of the funnel to the bottom of the vibration channelmust be (8 ± 4) mm;

d) stand.

3.2 Measuring cylinder

The measuring cylinder has a polished inner surface and a volume V of (200 ± 0,5) cm3; this volume is achieved by an

inner diameter of 64 mm and an inner height of 62,2 mm. The measuring cylinder is placed centrally under the stream

coming from the vibration channel.

The height of fall of the microgrit to be tested (from the upper edge of the channel bottom to the bottom of the measuring

cylinder) shall be (140 ± 1) mm.

Calibration of the measuring cylinder can be achieved by the following two methods.

Method A

The dry, empty measuring cylinder is weighed together with a flat glass plate. The measuring cylinder is filled withwater and the glass plate placed on the cylinder in such a way that no air bubble is present. The glass plate is heldin this position, the surplus water removed and the total weight determined.

The volume is calculated in the following way:

Vm

= 0

H O2ρ

(1)

where

V is the volume of the measuring cylinder, in cubic centimetres;

m0 is the mass of water, in grams;

rH2O is the density of water, in grams per cubic centimetre, at the measuring temperature.

Method B

The volume is calculated by measuring the internal dimensions of the cylinder (margin of error 0,01 mm).

It is recommended that the volume of the measuring cylinder be checked regularly.

IS 15289 (Part 2) : 2013

ISO 9136-2 : 1999

3

3.3 Overspill tray

The overspill tray with a flat bottom serves as a collector for overflowing microgrit. The measuring cylinder is placed

in the drip tray.

3.4 Shield

The shield is a glass cylinder of approximately 2 mm wall thickness with a diameter of approximately 110 mm and a

height of approximately 200 mm; the recess for the channel is approximately 125 mm 3 65 mm, permitting a free

fall for the microgrit to be tested.

4 Procedure

4.1 Number of observations

For each microgrit to be tested, the bulk density shall be determined from three samples taken from one sampling.

4.2 Sample preparation

The microgrit to be tested shall be dried for 1 h at a temperature of 110 °C, and then cooled to room temperature

before measuring.

4.3 Procedure

The test shall preferably take place at an air temperature of (23 ± 2) °C, and a relative humidity of (50 ± 6) %.

The microgrit to be tested is placed, in its dried form, in the funnel of the metering device. The metering speed,determined by the amplitude of vibration of the built-in vibrator in combination with the distance from the lower edgeof the funnel to the bottom of the vibration channel, is regulated according to the grains in such a way that

an even uninterrupted and regular stream flows into the vibration channel, and

the filling time of the cylinder is between 30 s and 90 s.

Before each measurement, the test conditions shall be verified.

The measuring cylinder shall be filled in such a way that the test material is heaped in the middle, 2 cm to 3 cmabove the rim of the measuring beaker.

The test material heaped above the rim of the measuring cylinder shall be removed using a straight blade with theleading edge at an angle of approximately 45° to the rim of the measuring beaker (see Figure 2).

Vibration shall be avoided throughout the measuring procedure (risk of compaction).

The measuring cylinder filled with microgrits shall be weighed to within 0,01 g.

4

IS 15289 (Part 2) : 2013

ISO 9136-2 : 1999

Key

1 Straight blade

a Moving direction

Figure 2 — Procedure for removing the heaped material

5 Calculation

The bulk density, rB , expressed in grams per cubic centimetre, is calculated as follows:

rB1=

m

V(2)

where

m1 is the net weight, in grams, of the microgrit held in the measuring cylinder;

V is the volume of the measuring cylinder, in cubic centimetres.

6 Results of measurements

The result of the test is the arithmetic mean of the three measurements.

7 Repeatability

Duplicate determinations by the same operator and apparatus shall not differ by more than ± 0,02 g/cm3.

IS 15289 (Part 2) : 2013

ISO 9136-2 : 1999

5

Bibliography

[1] ISO 6344-1:1998, Coated abrasives — Grain size analysis — Part 1: Grain size distribution test.

[2] ISO 6344-2:1998, Coated abrasives — Grain size analysis — Part 2: Determination of grain size distribution ofmacrogrits P12 to P220.

[3] ISO 6344-3:1998, Coated abrasives — Grain size analysis — Part 3: Determination of grain size distribution ofmicrogrits P240 to P2500.

[4] ISO 8486-1:1996, Bonded abrasives — Determination and designation of grain size distribution — Part 1:Macrogrits F4 to F220.

[5] ISO 8486-2:1996, Bonded abrasives — Determination and designation of grain size distribution — Part 2: MicrogritsF230 to F1200.

6

IS 15289 (Part 2) : 2013

ISO 9136-2 : 1999

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