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JSS3: BASIC TECHNOLOGY - 1ST TERM

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  1. Materials & Processing - Timber I | Week 1
    6 Topics
    |
    1 Quiz
  2. Materials & Processing - Timber II | Week 2
    4 Topics
    |
    1 Quiz
  3. Processing of Materials - Metals | Week 3
    5 Topics
    |
    1 Quiz
  4. Processing of Clay, Ceramics and Glass | Week 4
    5 Topics
    |
    1 Quiz
  5. Methods of Producing Plastics & Rubber | Week 5
    2 Topics
    |
    1 Quiz
  6. Drawing Practice - Isometric Drawing | Week 6
    4 Topics
    |
    1 Quiz
  7. Oblique Projection | Week 7
    2 Topics
    |
    1 Quiz
  8. Orthographic Projection | Week 8
    4 Topics
    |
    1 Quiz
  9. Perspective Drawing (One - Point Perspective Drawing) | Week 9
    4 Topics
    |
    1 Quiz



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Topic Content:

  • Meaning of Wood Preservation
  • Properties of Good Timber Preservatives
  • Classes of Preservatives
  • Methods of Applying Preservatives to Timber
  • Importance of Timber Treatment
Wood Preservation
Wood Preservation.

What is Wood Preservation?

Wood preservation is the process of applying chemicals to wood, so as to make it poisonous to insects, worms, and fungi, and to prolong its lifespan. The solutions used for this purpose are referred to as preservatives.

Properties of Good Timber Preservatives:

a) They must be toxic to fungi, pests and marine organisms.

b) They should not have corrosive properties.

c) It should not contain any harmful substances, gases etc.

d) It should not have an unpleasant smell.

e) It should not affect timber strength.

f) It should not be flammable.

Classes of Preservatives:

1. Tar Oils: The distillation of coal tar with kerosene, gives birth to a blackish-yellow solution, called creosote. It smells like carbolic acid. It is used on wood surfaces to protect it against insects and fungi.

Creosote oil
Tar Creosote oil.
Creosote
Creosote.

 

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