COATED AND NON-WOVEN ABRASIVES Coated Abrasive Basics Coated Abrasive Storage Stored under proper conditions, coated abrasives will retain their efficiency and usefulness over long periods. Improper or inadequate storage can introduce problems of weakened bond, curl, brittleness, and breakage. Temperature and humidity are the two most important climatic factors influencing coated abrasive performance. Backings and adhesives are sensitive to climatic changes and will gain or lose moisture according to the relative humidity of their surroundings. Excessive humidity may cause a softening of some types of adhesive bonds so that the product quickly fills and clogs, or loses its grain during use. Excessive dryness may cause brittleness, reduced flexibility, and distortion of product shapes. As moisture in the coated abrasive product increases or decreases, dimensional changes can occur. When the backing changes more than the adhesive bond, it causes cupping. High and low humidity can cause concave and convex cupping respectively. The newer synthetic-backed belts are not affected by moisture. Broad temperature swings will not permanently harm these products either, but cold temperatures will cause a “cold set” condition. Consequently, these products should be allowed to come to room temperature before use.
Coated Abrasive Grit Comparison Chart
AVERAGE PARTICLE SIZE IN MICRONS
GRADING SYSTEMS (OTHER THAN EMERY)
EMERY
ANSI
FEPA
JIS
PRODUCTS
5.0 6.0 6.5 8.4 8.5 9.2
– –
– –
–
– – – – – – – – – – – 0 – – – – – – – – – – – 1 – – – – – – – – 2 – – – 3 – – – – – – – – – – – – – – – – – – – – – – – – –
3000 2500
1200
-
4/0
P2500
–
–
– – – –
2000
1000
– –
3/0
10.3 10.5 12.2 12.6 15.0 15.3 16.0 18.3 19.7 20.0 21.8 23.6 25.0 28.8 30.0 35.0 36.0 40.0 40.5 44.0 45.0 46.2 50.0 52.5 53.5 55.0 58.5 60.0 64.0 65.0 66.0 78.0 79.0 93.0 95.0 97.0
– – – – –
P2000
1500 1200
800
P1500
– –
–
P1200
1000
600
–
–
2/0
–
P1000
800
500
– – – –
– – – – –
– – – – – – – – – – – – – – – – –
P800
400
600
25.75
P600
360
–
500
P500 P400
–
400
320
– – – –
–
STORE BELTS PROPERLY
STORE BULK ROLLS FLAT
360
TEMPERATURE/ HUMIDITY
P360
– – –
280
P320
320
–
–
P280
280
240
– – – –
– – –
P240
240
PRECONDITION BEFORE USE
KEEP PRODUCTS IN ORIGINAL PACKAGES
KEEP AWAY FROM HEAT/COLD SOURCES
P220
220
220 180
–
–
P180
180
Storage Facilities The ideal storage (stock) room for coated abrasives would be one in which all the walls are inside partitions, rather than the outside walls of the building. • Constant levels of humidity and temperature should be maintained. Stockroom temperature should be 60-degrees to 80-degrees F and relative humidity between 35 and 50%. • Cartons should be kept away from damp or cold walls and floors, where they might absorb moisture. • Store coated abrasives away from heat sources – steam heated radiators, steam pipes, hot air inlets, heat ducts, or rooms near furnaces or ovens. • Keep products in original packages. These packages facilitate handling and can be stacked in the most practical and convenient manner. • Bulk rolls should not be allowed to stand on edge after they have been unpacked. Store flat on shelves or pallets. • Narrow belts which have been removed from the carton should be rolled up and stored on edge on a clean shelf. Belts may be draped over a large cylinder, such as a gallon can, brake drum, or flanged hanger of the type used for a garden hose. Never hang a belt from a nail – the backing will crease and the abrasive belt might crack. Wide belts should be hung over a tube of at least 4" diameter. Center the belt joint over the tube and add a light weight (such as old packaging tubes) to the bottom loop of the belt to aid in removing set. Condition for 24 hours prior to use. • For maximum product efficiency, precondition coated abrasive products in a chamber of controlled temperature and humidity before use.
– – –
–
150
150
– – – – – – – – – –
– –
FINE
P150
116.0 127.0 136.0 141.0 156.0 189.0 192.0 197.0 260.0 268.0 326.0 341.0 351.0 412.0 428.0 524.0 535.0 622.0 638.0 715.0 740.0 905.0 984.0
120
–
120 100
P120
– – – –
– – – – – – – – – –
MEDIUM
100
P100
COARSE
80
80
P80 P60
60
–
60 50
P50
– –
EX. COARSE
50
–
P40
40
40
–
–
P36
36
–
36
–
P30
–
30 24
– –
30
–
–
P24
24
20
–
–
–
P20
20 16
1320.0 1324.0 1764.0 1842.0
16
–
– –
P16 P12
– – –
12
–
EZ Essentials Stock Abrasives Program
www.nortonabrasives.com
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