BONDED ABRASIVES
Bonded Abrasive Basics
How to Read an Abrasive Product Specification
Conventional Grinding Wheels
32A
46
I
8
V
BE
ABRASIVE
GRIT SIZE
GRADE
STRUCTURE BOND TYPE NORTON SYMBOL
ALUMINUM OXIDE 23A 25A 32A 32AC (blend)
CERAMIC ALUMINUM OXIDE
SILICON CARBIDE 37C 39C Crystolon Masonry
ZIRCONIA ALUMINA 4NZ 4ZF 5ZF AZ (blend) BlueFire Charger (blend) NZ NZC (blend)
COARSE 12 14 16 20 24
MEDIUM 30 36 46 54 60 70
FINE 80 90
SOFT D E F
MEDIUM I J K L M
HARD Q R S T
RELATIVE GRAIN SPACING DENSE
Resin = B Shellac = E Plastic = P Rubber = R Vitrified = V
Designates a variation or modification to bond.
100 120 150 220
2 4 5 6 8
3SGP 3SGR
G H
U V Y Z
5SG BRG SG SXG NorZon Plus (blend) NQ Quantum Targa NQN
N O P
38A 48A 53A 55A 57A U57A
12 16 19 25 28
NZIII NZIV NorZon ZI
OPEN
64A 86A 90A Alundum FabCut India Gemini Metal Vortex
Shelf Life and Proper Storage of Grinding Wheels It has always been Saint-Gobain Abrasives recommendation that resinoid bonded grinding wheels be used within 2 years from the date of manufacture. This recommendation assumes that resinoid bonded grinding wheels have been stored under ideal storage conditions. It might be true that under ideal storage conditions resinoid bonded grinding wheels can survive without any degradation in strength for well over two years. However, it is always wise to suspect any wheels over two years old and have them reinspected or re-speed tested to determine if there has been any degradation in strength. If the wheels are stored under less than ideal conditions, they might have a much shorter shelf life depending upon the severity of storage conditions. These same comments also apply to rubber and shellac bonded grinding wheels.
Example of Proper Grinding Wheel Storage
As for vitrified grinding wheels, the shelf life is less influenced by humidity and adverse storage conditions as compared to resinoid, rubber or shellac, but even vitrified grinding wheels do not have an infinite shelf life. The best procedure and the best rule of thumb is to have any wheel that is two years old or older re-speed tested and reinspected to ensure it is fit for use. The procedure for having this done and the charges will be explained by our Customer Service Department, but the cost of shipping as well as the cost of re-inspection is the customer’s responsibility. Also, any wheels rejected or otherwise lost in the re- inspection process will also be the responsibility of the customer. Keep in mind, however, that this procedure is good to verify the reliability of a product but must not be performed until you are ready to consume the wheel. If wheels are sent back after the two year time frame for re-inspection and re-testing and then put back on the shelf, there is no telling how long they will be fit for use after that last inspection. Therefore, these wheels must be consumed as soon as is practical.
Straight Wheels
Inclined Shelf For Small Wheels
Small Dish Wheels
Small Cups & Cylinders
Straight Wheels
Saw Gumming Wheels
Back Enclosed for Protection
Cutting-Off Wheels Plate of Steel or Flat Rigid Support Similar Material
Flat Shelf For Cutting-off Wheels and Shaped Wheels
Flaring Cup Wheels
Large Dish Wheels
Thick Rim & Hard Grade Cylinders
Corrugated Paper Cushions Supporting Plate Steel or thick Vitrified Abrasive Wheel
Thin Wall or Soft Grade Cylinders
Front Edge of Wheels Should Not Protrude in Front of Supports
Two Point Cradle Supports
Medium Size Straight Wheels
Large Straight Type 1 Wheels
EZ Essentials Stock Abrasives Program
www.nortonabrasives.com
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