What is a hook and loop sander pad?
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Answers:
It's a pad that attaches to your sander on the same principle as velcro. Little hooks on one side attaching to loops on the sander.
idk but hook & loop is like velcrow i think
One that kind of "velcro's" to a pad mounted to a drill or sander to hold the sanding pad in place and allow easy changing.
it's attached with a velcro-like connection instead of adhesive or mechanical clamping
What are the different types of sandpaper and what are they used for?
Aluminum Oxide - A synthetic brown-colored mineral that is tough and durable and is the most widely used abrasive grain. It is ideal for both woodworking and metalworking. (Non-Ferrous)
Silicon Carbide - A very hard and shiny black-colored mineral. This product has a brittle quality that allows it to fracture into sharp sliver-like wedges as it works. Can be used for everything from sanding non-ferrous and ferrous metals, plastics, composites, and wood products.
Garnet - A reddish brown mineral. It is of medium hardness with good cutting edges and has the tendency to break or fracture when used, thus creating new cutting edges. Used primarily for fine finishing of wood.
What are the different types of backing?
This decision is made by the type of abrasive and grit you have selected or the type of process you will be performing with the abrasive.
Paper - Used mainly for wood finishing in weights from A, C, D, E and F. “A” is the lightest weight.
Cloth - Produces a flexible backing in a wide range of weights. The more popular “J” and “X” weights are standard stock items. The “J” weight is the lightest and most flexible whereas the “X” weight is a heavier backing providing the widest range of use.
The weight of the backing is usually specified after the grit number. For example, 40D means 40 grit with "D" weight backing.
What does "grit" mean and which should I use?
Commonly referred to as “grit”, this number designation is determined by the amount of abrasive mineral that can pass through a mesh screen with specific size openings. Therefore, a 40 grit abrasive particle will pass through a mesh screen that has 40 openings in one linear inch.
Consequently, the higher the “grit” number results in a finer abrasive and will produce a smoother surface finish. The lower the “grit” number results in a coarser abrasive that will remove material much faster.
If the grit number is preceded by the letter "P", such as P2000, this indicates FEPA grit. Most sandpaper today is manufactured according to the international FEPA standard.
Grit size refers to the size of the particles of abrading materials embedded in the sandpaper. A number of different standards have been established for grit size. These standards establish not only the average grit size, but also the allowable variation from the average. The two most common are the United States CAMI (Coated Abrasive Manufacturers Institute, now part of the Unified Abrasives Manufacturers' Association) and the European FEPA (Federation of European Producers of Abrasives) "P" grade. The FEPA system is the same as the ISO 6344 standard. Other systems used in sandpaper include the Japan Industrial Standards Committee (JIS), the micron grade (generally used for very fine grits).
Grit size table
The following table, compiled from the references at the bottom, compares the CAMI and "P" designations with the average grit size in micrometres (µm).
ISO/FEPA Grit designation
CAMI Grit designation
Average particle diameter (µm)
MACROGRITS
Extra Coarse (Very fast removal of material) P12
1815
P16
1324
P20
1000
P24
764
24
708
P30
642
30
632
36
530
P36
538
Coarse (Rapid removal of material) P40
40
425
50
348
P50
336
Medium (sanding bare wood in preparation for finishing) 60
265
P60
269
P80
201
80
190
Fine (sanding bare wood in preparation for finishing) P100
162
100
140
P120
125
120
115
Very Fine (final sanding of bare wood) P150
100
150
92
P180
180
82
P220
220
68
MICROGRITS
Very Fine (sanding finishes between coats) P240
58.5
240
53.0
P280
52.2
P320
46.2
P360
40.5
Extra fine 320
36.0
P400
35.0
P500
30.2
360
28.0
P600
25.8
Super fine (final sanding of finishes) 400
23.0
P800
21.8
500
20.0
P1000
18.3
600
16.0
P1200
15.3
Ultra fine (final sanding of finishes) P1500
800
12.6
P2000
1000
10.3
P2500
8.4
Sanding methods:
Knowing your intention for the finished product before starting will make it easier to properly prepare the item being treated. The common approach to sanding is to begin with a lower grit paper, or coarser paper, and increase the fineness of the sandpaper until desired results are achieved.
Wood:
For best results, always sand in the direction of the wood grain. Typically 100 grit or 120 grit is recommended to remove or smooth out any paint or dirt on the surface being addressed. A final pass with 220 grit to 360 grit will create a sufficiently smooth surface for painting, staining and varnishing.
Metal:
Begin with loosening and scraping any loose paint or rust with a metal-toothed brush or coarse steel wool. Starting with a coarse grade of sandpaper move regularly over surface. Continue in this manner with increasingly finer grades of sandpaper until sufficient level of desired smoothness.
Plaster:
For plaster surfaces such as drywall, 120 grit to 180 grit should be sufficient for most surfaces. Plaster quickly wears away, and the surface of fine sandpaper can easily become filled with plaster dust, rendering fine sandpaper ineffective.
Just means that the sander of pad and sandpaper use Velcro
to stick together.
Hook & loop is a generic description for Velcro which is a "brand " name.
hook & loop is like velcro
it's Velcro
Velcro is brand name
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