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Description
Flashcards by maebhy wavy, updated more than 1 year ago
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Created by maebhy wavy
over 10 years ago
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| Question | Answer |
| A polymer is | A non-stick solid made up of long chains of molecules which are formed by joining shorter chain molecules |
| Plastic comes from the greek word | Plaskos which means mould |
| the raw materials of polymer are | ICI and dupont |
| thermo-softening polymers are | soft and can be reshaped many times after heating |
| thermo-setting polymers are | harder stronger and can not be softened and reshaped after heating |
| composite materials are | mixtures of metal, ceramics and polymers |
| 1.composite fibers provide 2. Polymers... | 1. strength 2. hold fibers together |
| two types of thermosetting polymers are | 1. epoxy resin - used to make very strong adhesives 2. polyester resin - used to make surf boards and swimming pools |
| two types of thermosoftening polymers are | 1. acrylic- car lights, baths, shop signs 2. polystyrene - food containers, toys, CD cases packaging |
| combination squar | used for measuring 45 angles and 90 angles |
| steel rule | used for measuring and drawing straight lines |
| tape measure | used for measuring distances greater than 300mm and curved surfaces |
| compass and spring dividers | used for marking circles and arks |
| templates are used for | tracing around to help get the right shape |
| scoring blade | used for scratching shallow groves so that the polymer cam be broken along the scored line |
| hack saw | used for cutting polymers |
| band saw and scroll saw | used for cutting sheet polymers along strait and curved lines |
| circular saw | used for cutting sheets of polymers along very strait lines |
| files | used for finishing edges |
| the three types of filing are | cross filing, strait filing, draw filing |
| the three types of files are | flat smooth, flat basted, second cut |
| the first step in finishing polymers is | trimming the edges because it was cut with a table saw |
| the second step in finishing is | cross filing with a second cut or flat basted then draw filing with a flat basted or second cut |
| the third step in finishing is | strait, cross and draw filing with a hand smooth and sanding it with 400 grit wet and dry |
| the forth step in finishing is | polishing it with braso or the buffing wheel |
| two was to join polymers are | adhesive bonding and cohesive bonding |
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