AMS 262 Final – Study Guide, Practice Questions & Comprehensive Revision
Definition of Plastic - ANS ✔✔large group of synthetic materials whose structures are based off
carbon, also called polymers
definition of cohesion - ANS ✔✔the intermingling of two surfaces (fusing)
definition of cold bending - ANS ✔✔the process of bending plastic without heat, 180T is the
min bend radius w/o causing damage
difference between colored and tinted plastic - ANS ✔✔colored plastic has a coloring agent
added and is not used in transparent enclosures, tinted plastic has been tinted for protecting
the pilots eyes and A/C interior
crazing - ANS ✔✔formation of tiny cracks in plastic, cause by UV rays or chemicals
definition of monolithic - ANS ✔✔slabular or single layered structure like concrete
definition of polymer - ANS ✔✔molecular structure formed by joining two or more chemicals of
similar structure
What color is acrylic - ANS ✔✔clear or tinted blue/green
what color is acetate - ANS ✔✔tinted yellow
what flame/smoke/smell does acrylic burn - ANS ✔✔small blueish flame, white wispy smoke,
mild odor
,what flame/smoke/smell does acetate burn - ANS ✔✔sputtering yellow flame, dark smoke,
strong bad odor
what does acetone do to acrylic - ANS ✔✔turns acrylic white
what does acetone do to acetate - ANS ✔✔softens it but no color change
what does zinc chloride do to acrylic - ANS ✔✔nothing
what does zinc chloride do to acetate - ANS ✔✔turns acetate milky/white
Where should you store plastics (temp, light, and moisture conditions) - ANS ✔✔cool, dark, dry
area away from chemicals, ozone, and UV rays
How should you store plastics (physical direction) - ANS ✔✔10 degrees from vertical in
supported racks or horizontal stacks not more than 18 inches tall
how long should you keep masking on plastics - ANS ✔✔unit the part is ready for installation or
forming
What should you clean plastics with - ANS ✔✔mild soap and water
what should you use to get stuck on masking off? - ANS ✔✔aliphatic naptha
What are the 5 methods of bending plastics - ANS ✔✔Cold bending, heat gun, oil bath, oven,
and heating strip
what is the minimum bend radius for cold bending - ANS ✔✔180T, answer is in inches
, what will excessive cold bending cause? - ANS ✔✔crazing
what solution should you use for oil baths - ANS ✔✔glyceride (non petroleum) solution
(petroleum based oils will cause crazing)
What tip angle is used for drilling plastics - ANS ✔✔60 degrees
what rake angle used for drilling plastics - ANS ✔✔0 degrees
how can you modify a standard drill bit to drill plastics - ANS ✔✔grinding
What kind of coolant/lubricant is used when drilling plastics - ANS ✔✔water soluble cutting oil
(water and compressed air can be used as coolant only)
definition of cementing plastics - ANS ✔✔a form of cohesion, 'glue joint' in plastic structures
when a solvent causes an intermingling of the two surfaces (the solvent never cures completely
unless joint is heat treated)
What are the two methods of cementing plastics - ANS ✔✔capillary action and soak/slow
method
what are defining characteristics of the capillary action method of cementing plastics - ANS
✔✔solvent is applied directly to the part using a needle like applicator, allowed to flow
throughout
What solvent is used for capillary action on acrylic - ANS ✔✔Ethylene DiChloride
Definition of Plastic - ANS ✔✔large group of synthetic materials whose structures are based off
carbon, also called polymers
definition of cohesion - ANS ✔✔the intermingling of two surfaces (fusing)
definition of cold bending - ANS ✔✔the process of bending plastic without heat, 180T is the
min bend radius w/o causing damage
difference between colored and tinted plastic - ANS ✔✔colored plastic has a coloring agent
added and is not used in transparent enclosures, tinted plastic has been tinted for protecting
the pilots eyes and A/C interior
crazing - ANS ✔✔formation of tiny cracks in plastic, cause by UV rays or chemicals
definition of monolithic - ANS ✔✔slabular or single layered structure like concrete
definition of polymer - ANS ✔✔molecular structure formed by joining two or more chemicals of
similar structure
What color is acrylic - ANS ✔✔clear or tinted blue/green
what color is acetate - ANS ✔✔tinted yellow
what flame/smoke/smell does acrylic burn - ANS ✔✔small blueish flame, white wispy smoke,
mild odor
,what flame/smoke/smell does acetate burn - ANS ✔✔sputtering yellow flame, dark smoke,
strong bad odor
what does acetone do to acrylic - ANS ✔✔turns acrylic white
what does acetone do to acetate - ANS ✔✔softens it but no color change
what does zinc chloride do to acrylic - ANS ✔✔nothing
what does zinc chloride do to acetate - ANS ✔✔turns acetate milky/white
Where should you store plastics (temp, light, and moisture conditions) - ANS ✔✔cool, dark, dry
area away from chemicals, ozone, and UV rays
How should you store plastics (physical direction) - ANS ✔✔10 degrees from vertical in
supported racks or horizontal stacks not more than 18 inches tall
how long should you keep masking on plastics - ANS ✔✔unit the part is ready for installation or
forming
What should you clean plastics with - ANS ✔✔mild soap and water
what should you use to get stuck on masking off? - ANS ✔✔aliphatic naptha
What are the 5 methods of bending plastics - ANS ✔✔Cold bending, heat gun, oil bath, oven,
and heating strip
what is the minimum bend radius for cold bending - ANS ✔✔180T, answer is in inches
, what will excessive cold bending cause? - ANS ✔✔crazing
what solution should you use for oil baths - ANS ✔✔glyceride (non petroleum) solution
(petroleum based oils will cause crazing)
What tip angle is used for drilling plastics - ANS ✔✔60 degrees
what rake angle used for drilling plastics - ANS ✔✔0 degrees
how can you modify a standard drill bit to drill plastics - ANS ✔✔grinding
What kind of coolant/lubricant is used when drilling plastics - ANS ✔✔water soluble cutting oil
(water and compressed air can be used as coolant only)
definition of cementing plastics - ANS ✔✔a form of cohesion, 'glue joint' in plastic structures
when a solvent causes an intermingling of the two surfaces (the solvent never cures completely
unless joint is heat treated)
What are the two methods of cementing plastics - ANS ✔✔capillary action and soak/slow
method
what are defining characteristics of the capillary action method of cementing plastics - ANS
✔✔solvent is applied directly to the part using a needle like applicator, allowed to flow
throughout
What solvent is used for capillary action on acrylic - ANS ✔✔Ethylene DiChloride
