1. Unit 2: Material Technology Describing specific materials
Dr. Hatem Elaydi
Engineering Technical English
Islamic University of Gaza
Feb. 13, 2016

2. Language note / Recycling
What is meant by recycling?
How does recycling affect engineering design?
Language note
magnetism = force of attraction
galvanized = coated with zinc (Zn) to prevent rusting
recyclable = can be recycled
chromium (Cr) and nickel (Ni) = metals added to steel to make stainless steel
traces = small quantities
scarcity = limited availability /rarity
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

3. Language note …
insulation = both electrical insulation and thermal insulation
wire = single strand of metal
scrap = waste material intended for recycling
alloy = a mixture of metals sometimes containing a non- metal, for example carbon (C) in steel
brass = an alloy of copper (Cu), zinc and, often lead (Pb)
bronze = an alloy of copper and tin (Sn)
melting down = using heat to change the state of a substance from solid to liquid
energy-intensive = using a lot of energy
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

4. Language note …
electrolysis = passing an electrical current through a liquid or solid in order to separate chemical compounds
ore = mineral from which metal is extracted
hardwood = timber from deciduous trees
softwood = timber from pine trees
ironmongery = collective term for small metal items commonly used in buildings, for example door handles, hinges, screws, nails.
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

5. Independent Reading/ Q1a
Scrapping cars
A lot of metal, notably steel, can be recycled. Intact parts can be recovered and resold. Oil, brake fluid and battery acid are potential pollutants which need to be disposed of carefully. Tires are more difficult to recycle.
Recycling electronics
Heavy metals such as lead, cadmium and chromium are potential pollutants and can also be recovered for recycling. The process of recycling electronic products is quite difficult due to the difficulty of breaking up and separating very small components.
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

6. Independent Reading/ Q1a …
Breaking up ships
Large amounts of steel can be recovered and recycled. Main pollutants are fuel oil from tanks and asbestos which was widely used as an insulation material inside ships.
Demolishing buildings
Structural steel can be recycled, concrete can be crushed and reused, for example in asphalt for road surfacing, copper in electrical wires can be recovered and recycled, good-quality bricks can sometimes be cleaned and reused. As with ships, asbestos is often found, requiring special precautions for its removal. The main difficulty is the time taken to demolish buildings meticulously.
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

7. 2.A Read the following web page and complete the missing headings using the words in the box.
Aluminum , Copper, Glass, Plastic, Rubber, Steel, Timber
Recyclable material
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

8. Recyclable material … 2 Glass 5 Timber 3 Copper 6 Rubber
Answers
2 Glass 5 Timber
3 Copper 6 Rubber
4 Aluminum 7 Plastic
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

9. Answers
2 a, 3 b, 4 f, 5 d, 6 h, 7 e, 8 g
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

10. 2C Answers 2 with 6 of 3 from 7 of 4 from 8 from 5 with
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

11. Independent work Q3
lrina, an ecological adviser, is talking to a group of engineers on a training course about environmentally friendly design.
In Groups, discuss the ideas from her slide and give some examples.
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

12. Independent Work Q3b
Use the CDs and Listen to an extract from the talk and compare your ideas with what lrina says. What example does she use to illustrate her main point?
You can read Irina extract in the next two slides.
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

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15. Independent Work Q3C lrina asks the engineers to do a simplified environmental audit. Their task is to compare steel and aluminum car bodywork from an ecological perspective. Listen to Sophia and Pete, two of the engineers, discussing the topic and make notes of their ideas.
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

16. Independent work/ Q3
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

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21. HW: In group, do an environmental audit for the following applications and materials. Use the words and phrases in the box.
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

22. Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305