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| SAASTE Technology |
|---|
| Key Concepts |
| Grade 4 - Grade 5 - Grade 6 - Grade 7 - Grade 8 - Grade 9 |
| Modules |
| Processing Grade 8/9 - Mechanical Systems Grade 9 - Structures Grade 5 - Structures Grade 8 |
| Activities |
| Conductors & Insulators - Electronic Circuits - AND & OR Gates - Circuit/Systems Diagram - Hydraulics - Hydraulics & Pneumatics - Technological Products - Preservation-1 - Identifying Materials - Properties of Materials - Preservation-2 - Electroplating - Conditioning-Strengthening/Waterproofing-1 - Conditioning-Strengthening\Waterproofing-2 - Shaping - Forming - Forces - Types of Structures - Mechanisms Worksheet |
Processing
Grade 6
Preserving
Wind, heat, water are some of the main causes of materials deteriorating. One of the ways to preserve these materials is to treat them with a preservative.
The material we will work with is wood.
You will need:
- Wooden peg, small piece of wood, wooden coaster, wooden spoon, wooden cutting board, classroom desk.
- Varnish, wax polish, silicone spray, cooking oil, lacquer, paint.
- Brushes, pieces of cloth, newspaper.
About preservatives
The technique you use will depend on:
- the condition of the article
- the type of preservative used
The choice of preservative will depend on:
- the type of article
- the intended use of the article
How to apply preservatives:
- In most case it is advisable to sandpaper the article first.
- If you are using paint, varnish, lacquer, etc use a clean brush and apply thin coats. Allow to dry between coats and sand lightly before applying the next coat.
- If you are using wax, apply with a clean cloth. Use a circular motion and finish off with straight strokes. You could also "buff" (shine) the article with a dry cloth.
- If you are using oil you could pour a little onto the article and then using a clean cloth rub the oil into the article. Wipe off any excess oil.
- If you are using sprays, apply thin coats. Sand in between coats.
Think and Do activity:
Think: Complete the table below to show what preservative you will use for each article, give a reason and say how you will do it.
|
Article |
Type of preservative |
Reason for use |
Technique to apply preservative |
|
Wooden peg |
|
|
|
|
Wooden spoon |
|
|
|
|
Wooden coaster |
|
|
|
|
Classroom desk |
|
|
|
|
Wooden cutting board |
|
|
|
Do: Select the wooden spoon and the wooden peg and do the preservation.
Author: Cheryl Jaftha
Editor: Osman Sadeck
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