IMSE 250 EXAM 2 | QUESTIONS AND ANSWERS | 2026 UPDATE | 100% CORRECT.
plastics - (answer)the general common term for a wide range of synthetic or semisynthetic organic
amorphous solid materials (H, C, O, and N).
General Properties of Plastics - (answer)-Low density
-Corrosion and chemical resistance
-Design versatility
-Variety of optical properties
-Formability
-Low tooling costs
The U.S. produces more _________ than steel, aluminum, and copper combined. - (answer)plastics
Polyethylene - (answer)most common plastic
polymers - (answer)long-chained molecule containing one or more repeating basic units (monomer).
Polymers can occur naturally and can be synthesized.
Polypropylene (PP) - (answer)Food containers, appliances, car fenders (bumpers).
Polystyrene (PS) - (answer)Packaging foam, food containers, disposable cups, plates, cutlery, CD and
cassette boxes. Fridge liners, food packaging
Polyvinyl chloride (PVC) - (answer)Construction materials (e.g.. pipes)
Acrylonitrile butadiene styrene (ABS) - (answer)Electronic equipment cases (e.g., printers, keyboards,
lego bricks), drainage pipe.
Polyethylene terephthalate (PET) - (answer)Carbonated drinks bottles, jars, plastic film
,IMSE 250 EXAM 2 | QUESTIONS AND ANSWERS | 2026 UPDATE | 100% CORRECT.
bioplastics - (answer)natural materials such as corn starch.
Lactic acid—polylactic acid (PLA), a thermoplastic looks and behaves like PE and PP.
Biodegradable plastics - (answer)petroleum-based plastics plus natural fibers such as
cellulose/lignin/hemicellulose etc.
thermoplastics - (answer)Formed by heating to elevated temperature at which softening occurs
- Reversible reaction
- Can be reformed and/or repaired
- Limited in temperature range to 150 ℃
Examples - ABS • can be injected - Thermoplastic adhesive
Characterists
• Tend to be flexible and tough
• Become harder and stronger when cooled
• Soften with increasing temperature
• Can be cast, injected into a mold, or forced into (through) dies to produce a desired shape
• Scrap can be re-melted and reused
thermosets - (answer)Cure by chemical reaction
Irreversible
Examples
• Polyester, vinylester - Most common, lower cost, solvent resistance
• Epoxy resins - Superior performance, relatively costly
, IMSE 250 EXAM 2 | QUESTIONS AND ANSWERS | 2026 UPDATE | 100% CORRECT.
Characteristics
• Significantly stronger and more rigid
• Have lower ductility
• Elevated temperature promotes irreversible reaction
• Additional heating do not produce softening
• Cannot be re-melted or reused
Casting of Plastics - (answer)• The simplest of shape forming processes
• Not all plastics can be cast
• There are castable thermoplastics and thermosets
• Relatively inexpensive
• Quality problems can occur (due to inadequate mixing, air entrapment, and shrinkage)
Plastic Injection Molding - (answer)Pros: Speedy production, Material and color flexibility, Affordable
method
Cons: Steep set-up fees, Lengthy lead time, Laborious modification
Plastic Extrusion - (answer)Pros: Hard and brittle plastics, Create atypical cross-sections, Smooth finish
Cons: Only good for 2D objects, Linearity must be maintained
How does the production line dry the ink printed on cups? - (answer)UV lamp
To make those plastic ware, at the very beginning, the resin is usually in the form of ______ -
(answer)pellets
Plastic cups are made from ________ - (answer)Thermoplastics
plastics - (answer)the general common term for a wide range of synthetic or semisynthetic organic
amorphous solid materials (H, C, O, and N).
General Properties of Plastics - (answer)-Low density
-Corrosion and chemical resistance
-Design versatility
-Variety of optical properties
-Formability
-Low tooling costs
The U.S. produces more _________ than steel, aluminum, and copper combined. - (answer)plastics
Polyethylene - (answer)most common plastic
polymers - (answer)long-chained molecule containing one or more repeating basic units (monomer).
Polymers can occur naturally and can be synthesized.
Polypropylene (PP) - (answer)Food containers, appliances, car fenders (bumpers).
Polystyrene (PS) - (answer)Packaging foam, food containers, disposable cups, plates, cutlery, CD and
cassette boxes. Fridge liners, food packaging
Polyvinyl chloride (PVC) - (answer)Construction materials (e.g.. pipes)
Acrylonitrile butadiene styrene (ABS) - (answer)Electronic equipment cases (e.g., printers, keyboards,
lego bricks), drainage pipe.
Polyethylene terephthalate (PET) - (answer)Carbonated drinks bottles, jars, plastic film
,IMSE 250 EXAM 2 | QUESTIONS AND ANSWERS | 2026 UPDATE | 100% CORRECT.
bioplastics - (answer)natural materials such as corn starch.
Lactic acid—polylactic acid (PLA), a thermoplastic looks and behaves like PE and PP.
Biodegradable plastics - (answer)petroleum-based plastics plus natural fibers such as
cellulose/lignin/hemicellulose etc.
thermoplastics - (answer)Formed by heating to elevated temperature at which softening occurs
- Reversible reaction
- Can be reformed and/or repaired
- Limited in temperature range to 150 ℃
Examples - ABS • can be injected - Thermoplastic adhesive
Characterists
• Tend to be flexible and tough
• Become harder and stronger when cooled
• Soften with increasing temperature
• Can be cast, injected into a mold, or forced into (through) dies to produce a desired shape
• Scrap can be re-melted and reused
thermosets - (answer)Cure by chemical reaction
Irreversible
Examples
• Polyester, vinylester - Most common, lower cost, solvent resistance
• Epoxy resins - Superior performance, relatively costly
, IMSE 250 EXAM 2 | QUESTIONS AND ANSWERS | 2026 UPDATE | 100% CORRECT.
Characteristics
• Significantly stronger and more rigid
• Have lower ductility
• Elevated temperature promotes irreversible reaction
• Additional heating do not produce softening
• Cannot be re-melted or reused
Casting of Plastics - (answer)• The simplest of shape forming processes
• Not all plastics can be cast
• There are castable thermoplastics and thermosets
• Relatively inexpensive
• Quality problems can occur (due to inadequate mixing, air entrapment, and shrinkage)
Plastic Injection Molding - (answer)Pros: Speedy production, Material and color flexibility, Affordable
method
Cons: Steep set-up fees, Lengthy lead time, Laborious modification
Plastic Extrusion - (answer)Pros: Hard and brittle plastics, Create atypical cross-sections, Smooth finish
Cons: Only good for 2D objects, Linearity must be maintained
How does the production line dry the ink printed on cups? - (answer)UV lamp
To make those plastic ware, at the very beginning, the resin is usually in the form of ______ -
(answer)pellets
Plastic cups are made from ________ - (answer)Thermoplastics
