Chrysotile of textile group - Gr.0 A****0, A****5 : Gr.1
A ****5. A *1—*0; Gr.2 A *2—*0, A *2—*2, A
*2—*5; Gr.3 A *3—*0, A *3—*0, A*3—*0: Gr.4 A
*4—*0, A *4—*0, A*4—*0, A *4—*0, A *4—5; Gr.5 A *5—*5, A
*5—*0; Gr.6 A *6—*5, A *6—*0,A *6—*0, A *6—*0;
Gr.7 A *7—**0, A *7—**0, A *7—**0, A *7—**0:
Gr.6K A *6 K—*5, A *6 K—*0, A *6 K—*0, A *6 K—5:
Special conditions of quality grade - U **0.
U**5. U**0. U**5. U**0. U**5. U**0:
Chrysotile of pipe group : A ****0;
A****0 ;A****0: A ***5 : A****0; A****0: A****0:
Special
conditions of quality : UHVL*4 : U*4T :
U**5: U***0:U***2:U***5:U***0: U**5:
Chrysotile of slate group: A****7: A****0:
A****0 grade : U**5:
Chrysotile of 5,6,7 groups
and short-fiber chrysotile : P****5: P****0: A*6K**0
: A*6K**0: A*6K**5: 7D: 7M;7R: A*****0:
A*****0:A*****0:
Chrysotile filler: AH-K6:
Quality control
Quality of chrysotile is supervised at all stages of the
production cycle, since entrance control of chrysotile ore and
finishing acceptance tests of finished goods during the packing
and shipment. Test laboratories are equipped with modern devices
of control and measuring instruments. Tests are carried out by
specially trained qualified personnel by standard techniques.
Tests allow to define:
fractional structure of chrysotile **6 groups by a dry method;
fractional composition of fiber on a wet method hydroqualifiers
Bauer-McNett and Turner-Newall;
average length of chrysotile fiber of 0,1,2 groups and content of
non-spinnable fiber (less than 5 mm);
degree of fiber separation capacity in elutriator;
wet volume;
fiber specific surface area in Rapid-Tester (OPA);
rate of chrysotile suspension filtration in lime mortar;
fiber strength in chrysotile cement samples (FSU).
Methods of chrysotile quality control
Dry method of fractional structure evaluation of chrysotile **6
gropus. Method is based on definition of quantitative
distribution of fibers of chrysotile on fractions by the way
screening on sets of the control device. Test on the control
device, founded by the Canadian Chrysotile Association, has the
world recognition as the standard on fiber classification. The
control device - the horizontal roar with longitudinally vertical
fluctuations on which platform 4 boxes with the sizes of openings
sieve in light are established, to mm: *2,7; 4,8; 1,*5; 0,4.
Dry method of evaluation of fractional structure of chrysotile
**6 groups on pneumatic qualifier. Method consists in definition
of quantitative distribution of fibers of chrysotile on fractions
at screening on the sieve under the influence of the current of
air. The pneumatic qualifier allows to define the mass fraction
of fiber more than 1,*8 mm and the mass fraction of the pedigree
dust less than 0,**5 mm.
Method of evaluation of average length of fiber of chrysotile
0,1,2 groups and contents of non-spinnable fiber (less than 5
mm). Method consists in definition of quantitative distribution
of chrysotile fiber on length at screening him on analyzer (ADA)
sets with the sizes of cells, mm: *8,0; *6,0; *0,0; 6,0; 3,5;
0,5. Chrysotile of textile groups delivered for export, (on
request of customers) in addition is tested by the techniques
developed by the Canadian Chrysotile Association and English
institute of textile products both recognized by all
manufacturers and consumers.
Wet method of evaluation of fractional composition of fiber on
the hydroqualifier Turner-Newall. Method consists in definition
of quantitative distribution of fibers of chrysotile on fractions
on five horizontally established sets under the influence of
vertical water flow. The standard sizes of openings sieve in
light, mm: 2,4; 1,2; 0,6; 0,3; 0,**5.
Wet method of evaluation of degree of separation capacity of
fiber on the elutriator. Method consists in definition of
quantitative distribution of fractions of chrysotile on
separation capacity under the influence of the water flow which
is pouring from one measured cylinder in another.
Method of wet volume evaluation. Method is based on volume
measurement of chrysotile in the damp condition after hashing of
his hinge plate with water in the inverter and the subsequent
upholding in the graduated cylinder.
Method of fiber specific surface area evaluation on Rapid-Tester
(OPA). Method is based on the principle of air permeability and
consists in measurement of resistance of the compressed sample of
fiber with the fixed weight and volume at constant hydraulic
pressure.
Method of determination of speed of the filtration of chrysotile
in limy solution. Method consists in measurement of speed, with
which water chrysotile suspension is dehydrated under certain
conditions.
Method of determination of durability of chrysotile fiber in
chrysotile cement samples. Essence of the method consists in
strength measurement on the cross-section rupture of specially
prepared chrysotile cement samples on the Dillon device.
