DEWALT DW8308 4-1/2-Inches x 7/8-Inches 60 Grit Zirconia Angle Grinder Flap Disc
 SPECIFICATIONS AND SELECTION METHODS






Widely used for removing excess material and cutting, within various angle grinder and handled cutting wheel machines.



Selection methods by clasification 


(1) Mark explaination product standard
 (2) Standard industry abrasive manufactures


Abrasives material explaination

1. Alumunium oxide

Alumunium oxide contains 3% titanium oxide in 1250 Celsius  degres oxidation which suitable to grinding         high strength tensile materials.
2. Silicone carbide

Harder than alumunium oxyde used for finishing work, low tensile strength materials, such as cast iron, non ferrous metal, non metallic materials.

3. Zirconia (ZrO2)- ceramics material
Combination Alumunium oxyde and zirconia oxyde, as Zirconia alumina grain, applications in cutting, many structurals material and medical tools

(3) Grain Size

increase grite(grain) size mean increase hardness working materials.
coarse soft, cutting ductile materials,fine brittle and hard materials when fine finish jobs requiring.

(4) Speed feeding 

(5) Bond  

Hold abrasive grain as super adhesive glue.
BF resin bonds.  fibre reinfoced woven or non moven, commonly used.
B  resin bonds duroplatics
Example product brochures




NO
WORKING MATERIALS
TAGS JOB
ABRASIVE
GRIT SIZE
1.
Aluminium
Aluminium Alloy
Alumunium Casting
Flat , curved surface blend finish grinding, cutting off, cleaning out casting fins
CC or GC
24-120
2
Brass, bronze and castings
Smoothing, blending surface, cutting off casting gating, riser, cleaning up fins
CC or GC
24-120
3
Cast iron
Smoothing , blending surface, cutting off casting gating,riser, cleaning up casting fins
AC or WA
24-120
4
Steel (Mild Hard)
Blending, finishing in either flat and curved surface, light cutting off , cleaning out flaw.
AA or AC
24-120
5
Steel ( Stainless)
Smoothing and blending surfaces, smoothing welds,cleaning out flaw.
WA
24-120
6
Steel
(Structural shapes)
Blending and finishinf in either flat and curved surface. Light cutting off, cleaning out flaw
AA or AC
24-120
7
Wrought Iron
Cleaning out flaw, smoothing , cleaning surface.
AC or WA
24-120
8
Non metal ( plastic,marble,firebrick,concrete, wood, etc)
Surface grinding , light cutting work
CC
24-120
9
Steel plate and sheet iron
Removing rust and scale,
scarfing ,beveling before welding, grinding,
polishing     before   painting.
AC or AA
24-120


Readers , can you answer what,s mean of E176-6 A 24 O SG