Sand Paper for Wood

What is Sand Paper For Wood

Sandpaper for wood is a type of abrasive paper used to sand and fine-tune wood surfaces. It is made up of fine mineral particles, such as aluminium oxide and silicon carbide, which are bonded to a paper or cloth backing. Sandpaper for wood comes in a variety of grit sizes, with lower grit numbers being coarser and higher grit numbers being finer. Coarser grits are used for heavy sanding and removing rough spots, while finer grits are used for smoothing and final finishing. Sandpaper is an essential tool in woodworking, allowing for the creation of smooth, polished, and even surfaces.

Advantages of Sand Paper For Wood

Smoother finish
Sandpaper is essential for getting a smooth finish on wood. It helps to eliminate rough patches and provides a uniform surface.

Better adhesion
Using sandpaper on wood helps to remove any old coatings, glue, or paint that may hinder new coatings from sticking.

Removes flaws and imperfections
Sandpaper helps to remove scratches, dents, and other imperfections from the surface of the wood.

Flexibility in use
Sandpaper comes in different grits and sizes, making it possible to use it for varying levels of sanding, from coarse to fine.

Versatile
Sandpaper can be used on a variety of different types of wood, including softwoods, hardwoods, and composites.

Inexpensive
Sandpaper is cost-effective when compared to other types of wood finishing products, and it can be used multiple times by reusing or folding the sandpaper.

Easy to use
Using sandpaper is a relatively easy process, and even beginners can achieve a smooth finish with the right technique.

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Types of Sand Paper For Wood

Here are the basic industry terms:

Aluminum oxide

Sometimes abbreviated AO, it's the most common type of abrasive. Nearly all the sandpaper you buy for wood, whether as sheets or discs, will be aluminum oxide. These sheets are typically brown or maroon in color.

Zirconia alumina

Abbreviated Zirc, it's a long-lasting abrasive often employed in aggressive stock removal, such as the flap discs you might purchase for an angle grinder or a belt sander for shaping wood. They're most often blue or green.

Silicone carbide

These abrasives are versatile, durable and generally more expensive than AO or Zirc abrasives. You will often find this abrasive if you purchase high grits (roughly 400 grit or up) or sandpaper at a metal working or auto body shop. These are generally black and the backing often water-resistant, making it the best choice for wet sanding applications such as polishing a finished tabletop.

How To Choose the Right Sandpaper for Wood Projects

Understanding Sandpaper for Wood: Grit Size

The first thing you need to understand is grit size. Sandpaper is nothing more than tiny particles, most often made of metal compounds, that adhered to a backing - often, paper. The size of those particles determines the grit size.

The lower the number, the larger the particle size and the coarser the sandpaper will be. That removes material faster while leaving a rougher surface. The higher the number, the smaller the particles, which leave a smoother surface. There's no end to how long and how fine you can sand, but for our purposes we'll focus on four main grit ranges.
Coarse grit = 36 to 80: This is best for fast stock removal, such as smoothing the live edge of a slab or sanding down rough-sawn surfaces.

Medium grit = 100 to 180: This will remove any mill marks from your machines and give you a generally clean and clear surface. Some finishes will recommend only sanding up to 180 to allow the finish to "bite" onto the surface of the wood, so be sure to read the instructions before applying your finish.
Fine grit = 220 to 400: I generally sand up to 220. This gives me the best clarity of grain on the surface of the wood. I may sand with 400 grit sandpaper or an equivalent abrasive cloth after the final coat of finish to give a nice, smooth surface to the piece.
Polishing grit = 600 and up: These grits, for polishing finished surfaces, are only occasionally employed in the wood shop.
Bonus fact: Europe has a different grit scale than the U.S. If ever you see the grit size labeled P-180 or P-220, that's the European scale. And while it's not an exact equivalent, it's close enough. I consider it basically the same.

Hand Sanding vs. Machine Sanding

Depending on your sanding setup, you may need different styles of sandpaper. The most common are as follows:

Hand sanding
Sheet sandpaper: You can find sanding sheets in various sizes, but the most common are 9-in. x 11-in. and 9-in. x 3-in. These sheets generally have a smooth paper back and are fairly rigid when folded. They can get into crevices and corners that machines can't, letting you sand every square inch of your project.

Sanding blocks: These semi-rigid, spongy blocks are often sold at hardware stores for a significant markup over sanding sheets. While they have their useful applications (drywall sanding comes to mind), they are not all that useful in the wood shop. Don't waste your money. Buy sandpaper sheets and make your own sanding blocks!

Machine sanding
Sanding discs: These discs are generally five or six inches in diameter, so make sure you know the size of your sander. There are also two styles of backing: hook-and-loop (AKA H&L or Velcro) and pressure sensitive adhesive (PSA). While H&L discs are far and away the most common, don't assume every package is H&L. Make sure you get the right disc for your machine.
Note: Here are Family Handyman's picks for the best sanders for wood projects.

What do Sandpaper Grit Numbers Mean?

Seeing sandpaper on a project checklist may seem like an easy enough item to check off - that is, until you hit the hardware store and face stacks of sandpaper sheets and booklets, each distinctly identified with different numbers that indicate sandpaper grits.

Each sandpaper grit performs a different job. Generally, the lower the grit number, the more coarse the grit. Therefore, a sheet of 220-grit sandpaper is more coarse than a sheet of 400-grit sandpaper. Coarser grits are used for heavy sanding on rough and uneven surfaces, while fine grit sandpaper is used to polish and finish the surface of materials. Usually more than one - and often three - types are needed for most projects.
It's helpful to learn about different sandpaper grits, so you can find the right options for your next project.

What do sandpaper grit numbers mean?
Sandpaper consists of fine particles from either natural or synthetic sources. The particles (also known as grains or grit) are sifted through screens and sorted by size before being bonded with adhesive to a paper, sponge, or cloth-type backing to create an abrasive material.

In the United States, grit is determined based on a gradation scale established by the Coated Abrasive Manufacturers Institute (CAMI). The higher the number, the finer the sandpaper grit. Most sandpaper follows the CAMI scale, but if you order sandpaper online, you may run across sandpaper grit sized by the Federation of European Producers of Abrasives (FEPA).

Grit sized with the FEPA scale is indicated by the letter "P” preceding the grit number. FEPA sizes are not identical to CAMI sizes, but you can find a very similar option by selecting one of the two closest FEPA numbers.

Sand Paper For Wood - How to Choose the Right Sandpaper Grit

Manufacturers may indicate sandpaper grit by the number or by describing it, so it's helpful to know what each description means.
Extra coarse sandpaper (24 to 36 grit): Used for removing paint and varnish, sanding old floors might also require extra coarse sandpaper.
Coarse sandpaper (40 to 50 grit): Used to roughly shape wood and remove old finishes, such as light coats of polyurethane.
Medium sandpaper (60 to 80 grit): Primarily used to sand rough wood and remove scratches and planning marks.
Fine sandpaper (100 to 120): For most DIY projects, this sandpaper will suffice for final smoothing before the work is finished.
Extra fine sandpaper (150 grit or higher): Often used between coats of paint or varnish, as well as for finishing.
On many projects, you'll start with a coarse sandpaper grit, then gradually switch to finer grits to obtain a smooth finish.

Sand Paper For Wood - Types of Sandpaper Grit Material

Most manufacturers list the type of material best suited for sanding on their product labels, but it's smart to know what type of grit material to look for before you shop. The following are the most common types of sandpaper materials that DIYers may encounter.

Flint
Flint sandpaper's surface has pulverized flint (or quartz) that creates its textured surface. It's the oldest type of sanding paper and known for being inexpensive. A natural grain, flint is not durable and is traditionally used for light sanding and polishing. It can be rinsed after sanding jobs for repeated use.

Emery
Emery sandpaper features a natural grain that's most often used for removing corrosion and/or polishing steel and other metals. The edges of its particles can be too sharp for sanding wood, and is best for deburring, paint removal, or mechanically finishing a surface.
Often referred to as emery cloth, the abrasive is actually glued to a cloth rather than a paper so it is actually a little more durable than sandpaper.

Garnet
Another natural grain, garnet, is slightly softer than flint and emery. Used for polishing and fine sanding of wood, leather, and plastic, it tends to dull relatively quickly when used to sand metal. While it will wear quickly while it's being used, the rapid wear helps to create a finer finish on the surface it's sanding. Some use it for power sanding, but it's also used as a hand sander.

Zirconia Alumina
Until ceramic was used, zirconia alumina was the most abrasive grain available for sanding projects. A synthetic product, this grit is long lasting and ideal for grinding away burrs on metal and for an initial sanding of rough wood. When sanding metal, the grit particles can actually become sharper, so you won't have to change sandpaper frequently.

Aluminum Oxide
Another very durable synthetic grit, aluminum oxide is well suited for sanding and polishing various types of metal, including bronze and alloy steel. It's known for being long-lasting and can be found in a variety of grits from fine to coarse. Aluminum oxide is also a good choice for sanding all types of hardwoods.

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We specialized in researching, designing and manufacturing various types of hardware tools for wood and tile. Our cutting, grinding, polishing and coring tools are engineered in a variety of grades for DIY customers and professional users.

FAQ

Q: What is sandpaper used for on wood?

A: Sandpaper is used to smooth and finish wood by removing rough spots, blemishes, and scratches. It can also be used to prepare the surface of the wood for painting or staining.

Q: What are the different types of sandpaper for wood?

A: There are several types of sandpaper for wood, including coarse, medium, fine, and extra fine grits. Coarse sandpaper is used for removing rough patches, while fine and extra-fine grits are used for finishing.

Q: How do I choose the right grit of sandpaper for my wood project?

A: The grit size you choose depends on the condition of your wood and the type of finish you want to achieve. If the wood is rough, use a coarse grit sandpaper to remove the roughness. If you want to achieve a smooth surface, use a finer grit sandpaper.

Q: How do I use sandpaper on wood?

A: Start with the coarser grit of sandpaper and work your way up to a finer grit. Sand with the grain of the wood, and make sure to move the sandpaper in a circular motion to avoid creating a groove. Sand until you achieve the desired level of smoothness.

Q: Can sandpaper be reused on wood?

A: Sandpaper can be reused on wood if it is in good condition. However, if the sandpaper is worn or torn, it should be replaced to ensure a smooth finish.

Q: How do I know when to stop sanding the wood?

A: Stop sanding the wood when it is smooth to the touch and free of blemishes and scratches. You will also know when to stop sanding when the wood starts to look shiny.

Q: What kind of sandpaper do you use on wood?

A: For heavy sanding and stripping, you need coarse sandpaper measuring 40 to 60 grit; for smoothing surfaces and removing small imperfections, choose 80 to 120 grit sandpaper. For finishing surfaces smoothly, use extra fine sandpaper with 360 to 400grit.

Q: What is the best sandpaper for woodwork?

A: 60-grit sandpaper is generally the roughest sandpaper used for woodworking, although especially rough 40-grit sandpapers are also available. Use coarse sandpaper when you want to remove wood quickly and aggressively. 60 and 80-grit are perfect for flattening out gouges and removing loose fibres, old paint, and varnish.

Q: How do I know what sandpaper to use?

A: For heavy sanding and stripping, you need coarse sandpaper grit measuring 40- to 60-grit; for smoothing surfaces and removing small imperfections, choose medium sandpaper from 80- to 120-grit sandpaper. To finish surfaces smoothly, use a super fine sandpaper with 400- to 600-grit.

Q: What is the best sandpaper for wood by hand?

A: Garnet is good for hand-sanding. It works well on raw wood, removing light scratches and preparing the surface for finishing. The abrasive particles break during use, providing new edges for removing material, but garnet sandpaper wears quickly. Emery works for both hand-sanding and power-sanding metal.

Q: Do you need to sand wood before you paint it?

A: Painting wood surfaces is not difficult, but it does take some time. Wood behaves differently from other surfaces such as painted walls, metal, or drywall. Bare, uncoated wood rapidly soaks up paint, so primer is always necessary. Painted or coated wood needs to be lightly sanded to provide the primer with grip.

Q: What grade sandpaper for wood trim?

A: Start with coarse, 80-grit sandpaper and then move to less-coarse 100- and 120-grit. If the trim is new, use only 120-grit just enough to remove any sheen from the surface. Folded sandpaper or a sanding block can be used for flat surfaces. Use a sanding sponge for curved areas and crevices.

Q: What does sandpaper do to wood to make it smoother?

A: When you sand wood, you are using abrasives to remove small layers of the wood's surface, which helps to even out any rough or uneven areas, creating a smoother finish. Different grades of sandpaper can be used to achieve different levels of smoothness, with finer grits producing a smoother surface.

Q: What grade sandpaper for wood furniture?

A: My go-to combination for the perfect finish is 80-120-320 grit sandpaper. I start with 80-grit sandpaper to remove any old finish and paint. It may take a little longer to get down to bare wood as opposed to using lower-grit sandpaper, but there is less risk of damage.

Q: What is the difference between the colors of sandpaper?

A: Sandpaper comes in different colors. This has to do with the type of material it's suitable for. Dark sandpaper sheets are for natural wood, chipboard, and metal. White paper often lasts longer and can be used for paint, filling materials, and wall putty.

Q: Do you use wet or dry sandpaper first?

A: If you want to have this glossy finish, you'll dry sand first and then wet sand. You can always finish off by buffing and polishing if you want to reach a mirror-like finish.

Q: Do you sand in circles or straight lines?

A: When hand sanding, it's generally recommended to sand in the direction of the wood grain. This means sanding in straight lines along the length of the wood, rather than in circles. Sanding with the grain helps to prevent visible scratches and ensures a smoother finish.

Q: What to do after sanding wood?

A: After sanding a piece of wood, you'll need to clean it before adding a stain or paint. You can use a variety of tools and techniques to remove sanding dust from your wooden surface. Just make sure you get the surface of your project as clean as possible before adding any paint or stains to finish the piece.

Q: What grit sandpaper for 2x4?

A: Start with 80 grit, pretty much always. Get the surface as flat and level as you prefer. It won't be smooth yet. Then progress through the grits 100/120/150/180/220.

Q: What are the golden rules of sanding?

A: The golden rule of sanding is to start with a grit coarse enough to quickly remove surface imperfections and follow with incrementally finer grits. Each successive grit erases the scratches of the coarser one before, until the scratches themselves become undetectable to the eye and the touch.

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