fibre emission while handling fibrocement and friction

fibre emission while handling fibrocement and friction

FIBRE EMISSION
WHILE HANDLING
FIBROCEMENT
AND FRICTION
PRODUCTS
MARCEL COSSETTE, ing.
Consultant, Medico-legal and technological expertise, Sherbrooke
(Québec), Canada
DENIS HAMEL, M. ATDR.
Consultant, HEC Montréal, Montréal (Québec), Canada
PIERRE MAROIS, ing., M.Sc.A.
Director general, Centre de Technologie minérale et de Plasturgie
inc., Thetford Mines (Québec), Canada
3,0
Results by tool and by product
(dry cut only)
Emissions
With chrysotile
Without chrysotile
Tools
Min.
Max.
Avr.
Min.
Max.
Avr.
Electric Abrasive disc
1,40
25,60
12,60
< 0,10
0,80
0,50
Grind
0,23
46,70
17,86
0,23
26,00
13,12
Saw @ 250 rpm
0,40
1,90
0,92
0,20
0,50
0,35
Saw @ 500 rpm
0,40
3,50
0,80
0,20
0,60
0,29
0,08
0,19
0,14
--
--
--
Cutter
0,48
0,50
0,49
0,27
0,30
0,29
Field lathe
0,01
0,01
0,01
--
--
--
Manual Slice
Average results by product and tool (f/cc)
(electric tools only - dry cut, without vacuum system)
Product
Abrasive
disk
Saw
@ 250
rpm
Saw @
500
rpm
C/C corrugated sheet
6,15
0,40
0,40
Propylene/C corrugated sheet
0,30
0,45
0,25
PVA/C corrugated sheet
0,80
0,50
0,60
C/C flat sheet
1,40
1,00
0,60
Cellulose/C flat sheet
0,70
0,30
0,25
C/C pipe
25,60
0,40
0,40
C/C pressure pipe
14,90
1,40
1,80
Grind –
light
abrasion
Grind –
heavy
abrasion
Friction product w/chrysotile
0,27
35,45
Friction product without chrysotile
0,23
26,00
0,25
32,30
Average
6,55
0,66
0,53
Effect of saturation treatment on products
Tool
Value
dry
Value
wet
7 mm chrysotile-cement
corrugated sheet
Saw @ 500
rpm
0,40 f/cc
0,20 f/cc
185 mm chrysotilecement pipe
Saw @ 500
rpm
0,40 f/cc
0,16 f/cc
185 mm chrysotilecement pipe
Abrasive
disk
25,60 f/cc 7,60 f/cc
170 mm chrysotilecement pressure pipe
Abrasive
disk
14,70 f/cc 8,80 f/cc
Product