THE SPECIFICATION

Micropowders abrasive superhomogeneous with the normal and heightened requirements to isotropic of a grain. Granularities M40-M3.
1. Under the technical conditions INOX Ltd. (3988-003-49082222-98) industrially issued polished-powders of a granularity M40-M3 subject to dry thin clearing of coarse and fine fractions. Thus the heightened dimensional homogeneity of grain structures polished-powders concerning the requirements a GOST 3647-80, FEPA and others are reached.
The preliminary ovalization polished-powders (isometrization of grains) with the subsequent thin clearing of a content of coarse and fine fractions follow-up increases their dimensional homogeneity (reduces dimensional dispersion of a grain in the main fraction, increases a content of the main fraction and mean strength of grains).
The applying of polished-powders with a heightened dimensional homogeneity, including with preliminary isometrization of grains, allows:
* To improve the quality grindings and polishings of parts, for example, in optical productions, and also to increase an output of suitable parts at their formation manufacturing;
* To improve the quality and durability of an abrasive tool, made of them, (circles, head, grinding bars etc.); to increase processing capacity by an abrasive tool at the expense of increase of an effective surface of a contact with a work piece.
2. Parameters of grain structures of polished-powders

Identification  of grains by GOST 3647-80, GOST 9206-80 and OST 2MT79-2-88

GRAIN COMPOSITION

FRACTIONS

Main

Coarse

Fine

 Nominal size of a particle, mkm

Runaway tolerance of Rated size of a grain, mkm 

Content, %, not less than

Limit size of a grain, mkm

Content, %,  not greater than

Limit size of a grain, mkm (more finely than)

Content, %, not greater than

M40 (40/28)

34

6

80

60-40

5

28

15

M28 (28/20)

24

4

80

40-28

5

20

15

M20 (20/14)

17

3

80

28-20

5

14

15

M14 (14/10)

12

2

75

20-14

5

10

20

M10 (10/7)

8

2

75

14-10

5

7

20

M7 (7/5)

6

1

75

10-7

5

5

20

M5 (5/3)

4

1

75

7-5

5

3

20

The contents of isometric grains in ovalizated structures of polished-powders - not less than 80 %.
In view of the heightened requirements to a dimensional homogeneity of grains of polished-powders identification of their granularities is supplemented by a word "Super", or word "Super-oval" - for ovalizated structures of polished-powders . The nominal size of a grain of the main fraction is adduced with tolerance by rejections within the limits of dimensional boundaries of a grain structure of the main fractions of polished-powders. For nominal size of a grain the half-sum of boundary aggregate size of the main fraction is received.
3. Examples of conventional sign of polished-powders (for the booking):
* polished-powders of silicon carbide of the green mark 64C, granularity M14:
polished-powders, silicon carbide 64C M14 Super 12 (2 Specifications 3988-003-49082222-98;
* Thin polished-powders of silicon carbide of the black mark 54C, granularity M10:
Thin polished-powders, silicon carbide 54C M10 Super 8 (2 Specifications 3988-003-49082222-98;
* polished-powders of electroemery of the white mark 25A, granularity M14:
polished-powders, electroemery white 25A M14 Super 12 (2 Specifications 3988-003-49082222-98;
* polished-powders of electroemery of the normal mark 14A, granularity M14:
polished-powders, electroemery normal 14A M14 Super 12 (2 Specifications 3988-003-49082222-98;
* polished-powders of carbide of a boron (without the mark), granularity M14:
polished-powders, carbide of a boron M14 Super 12 (2 Specifications 3988-003-49082222-98.
polished-powders, silicon carbide 64C M14 a Super-oval 12 (2 Specifications 3988-003-49082222-98.
4. The delivery is made in pressurized tare; a volume from 200 mls.