Abrasives


Click Image to enlarge
An abrasive is a material, often a mineral, that is used to shape or finish a piece of material through rubbing which leads to part of the work being worn away.

The main abrasive we use in Clounagh is sandpaper, emery paper and wet and dry emery paper.

Sandpaper is a form of paper where an abrasive material has been fixed to its surface. Sandpaper is part of the “coated-abrasives” family of abrasive products. It is used to remove small amounts of material from surfaces, either to make them smoother (painting and wood finishing), to remove a layer of material (e.g. old paint), or sometimes to make the surface rougher (e.g. as a preparation to gluing). When the planning has been done it is a good idea to use the sandpaper wrapped around a cork block to give a final smoothness to the wood prior to varnishing.

You used this type of abrasive to smooth the wooden part.

Emery paper is a type of paper that can be used for sanding down hard and rough surfaces. It can also be used for resistant technology purposes to give a smooth, shiny finish to manufactured products and is often used in the finishing of high-end watch movements. Similar to sandpaper, it is made by gluing small particles of the mineral emery to paper.

You used this type of abrasive to give a final smooth to the plastic before using the polishing machine.

Emery paper can also be used on metal.

Other Material as an abrasive.

Materials used for the abrading particles are:

• flint — no longer commonly used

• garnet — commonly used in woodworking

• emery — commonly used to abrade or polish metal

• aluminium oxide — perhaps most common in widest variety of grits; can be used on metal (i.e. body shops) or wood

• silicon carbide — available in very coarse grits all the way through to microgrits, common in wet applications

• alumina-zirconia — (an aluminium oxide – zirconium oxide alloy), used for machine grinding applications

• chromium oxide — used in extremely fine micron grit (micrometre level) papers

• ceramic aluminum oxide — used in high pressure applications, commonly known as CubitronTM a 3M Corp.

Advertisements

23 Responses

  1. i thought that this page was very interesting and gives me lots of help revising for my exams! 🙂

  2. This web site rocks its da best it helps me for revison for exams in summer it rocks!!! keep it up technology teschers:)

  3. will you have to know the other types of abrasives 4 the exam?

  4. No just the ones we used in school. CTD

  5. do u hav 2 no wat sandpaper is made from

  6. Just what it is used for and how to use it. CTD

  7. Wat do u mean that a abrasive is often a mineral????

    Do we need 2 no all of the other material as an abrasive like, flint, garnet, emery, aluminuim silicon oxide, alumina carbide, alumina-zirconia, chromium oxide and ceramic aluminium oxide?????????

  8. Just what it is used for. CTD

  9. I’m Confused!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    Do we need 2 no da other abraisives r just da 1s we used – Do we only need 2 no just wat we used sandpapr 4 r do we need 2 da bit above it (same wit emery paper) ??????
    tnks lauren

  10. It is just what you used in class and how it was done.

  11. i dont remember doing dis about abraisives
    do i need 2 no it 4 2morrow in the technology exam

  12. Abrasives = sandpaper for wood and emery cloth for metal.

  13. this is helping alot for 2moros exam but im stil abit confused ,, do we need to know da whole paragraphs about sandpaper and emery paper? ? =]

  14. If you used it in class then you need to know how it was used. CTD

  15. This site is so coooool it really helps when you have exams

  16. thnx soo much!

  17. This is a great site for revision. It helps so much! Thanks Clounagh Technology Teachers 🙂 😀

  18. I love this website:P

  19. Good site, just the information i was looking for about abrasives

  20. Cant wait til thursday again to finish our coat hooks havin loads of fun making them

  21. I love technology it is very very fun i really like our teacher 🙂 the coat hooks are fun but i think im mucked up :/

  22. i have learn a lot from this web i am going inn for an exam in my country,i have known something about abrasive will always like to pas on hear for research and i appreciate the knowledge over hear keep it on sir

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: