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Materials > Windows and Lenses > Flashcards

Windows and Lenses Flashcards

1
Q

What are the 2 main categories of plastics?

A

Thermoplastics

Thermosetting plastics

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2
Q

1st category of plastic:

plastics that can be softened by heat and dissolved in various organic solvents.

example: toluene, turpentine, acetone, methyl

A

Thermoplastics

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3
Q

Why we use plastics usually?

A

It’s more lighter than glass windshields

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4
Q

Cellulose Acetate Plastic
Acrylic plastic
Polycarbonate plastic

A

3 categories of thermoplastic

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5
Q

Type of thermoplastic?
-can be softened by heat and dissolved in various organic solvents

  • not commonly used anymore
  • Subject to dimensional instability. Extracts too much with heat
  • turns yellow with time
A

Cellulose Acetate Plastic

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6
Q

Type of thermoplastic?
-quite common in the industry, moderately strong, easy to handle

  • can be quite brittle when under load, easily scratched
  • Trade names are Plexiglass, Lucite, Perspex
A

Acrylic Plastic

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7
Q

Type of Thermoplastic?
-Contains Bisphenol. Use safety gear and VERY COMMON to aviation industry

  • Trade names: Lexan, Makrolon, Makroclear
  • Extremely effective at transmitting light, very high impact resistance, but easily scratched
  • It can undergo large plastic deformations without breaking
A

Polycarbonate plastic

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8
Q

2nd Category of plastic

  • do not soften under heat. Molded to it’s final shape
  • Blisters at temperature of 400⁰F to 500⁰F
A

Thermosetting Plastics

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9
Q

a POLYCARBONATE transparent plastic that has excellent cold working properties and can be bent to a fairly tight radius without having a failure.

A

Lexan

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10
Q

an ACRYLIC transparent plastic may also be cold bent if material thickness is thin and bending radius is at least 180x the thickness of the material

A

Plexiglass

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11
Q

If acrylic plastic is bent beyond limits, local stress at the surface will cause tiny fissures or cracks to form. This type of damage is called _____?

A

CRAZING

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12
Q

How to store plastic sheets?

A

Lay it 10 degrees angle or stack it horizontally

Store away from heat !very important!

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13
Q

What do you need cleaning in cleaning the window?

A

Plenty of water, the palm of your hand and your fingernails.

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14
Q

Best thing to remove bugs on your windshield?

A

At DAWN, dew will begin to form on the windows.

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15
Q

products containing ______ are extremely damaging acrylic plastics. (Windex)

A

Ammonium

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16
Q

Are you allowed to use standard metal or wood cutting drill bits?

A

Fucking NO, you will risk chipping or cracking the material.

17
Q

Grind the tip angle (usually a relatively flat ___-___) to a sharp 60⁰ - 90⁰ This sharp angle allows the bit to easily enter and exit acrylic sheet without chipping.

A

118⁰ - 120⁰

18
Q

Always drill _____ holes to allow everything to move around.

A

oversized/larger

19
Q

Never drill holes in ______ process. Start with smaller hole and work way up to finish size.

A

One

20
Q

Largest hole you should drill in one step is _____?

A

1/4” (0.250”)

21
Q

Using ______ may help you accomplish smaller holes to finish size holes.

A

Step drill

22
Q

ATA chapter for Window Damage limits?

A

ATA 56

23
Q

Always remember to find the ______ of the scratch before working on it.

A

deepness

24
Q

Which sandpaper is coarser? 400 or 800?

A

400

25
Q

Water also acts as a ______ to prevent acrylic plastic from being overheated.

A

coolant

26
Q

When sanding with the finer abrasives, cross your sanding pattern at _______ degree angles from one step to the next, to be sure of total removal of previous sanding pattern.

A

90 degree

27
Q

When cutting plastic windows. Never use a saw that has a _____ blade.

A

reciprocating

use a BAND saw instead

28
Q

When trimming acrylic plastics to FIT IN A GIVEN AREA, the fine detail work is best accomplished through the use of a small hand held 90⁰ ________ equipped with a small sanding disc with a 80 grit or 100 grit pad.

A

die grinder

29
Q

In the case of a crack, all of the ends of the crack can be stop-drilled with _____ drill bit.

A

30 (0.1285” or 1/8”)

30
Q

Permanent repair can be made to acrylic plastic by using a _____ such as PS-30 or weld-On and a hypodermic syringe.

A

“Polymerizable cement” such as PS-30 or weld-On and a hypodermic syringe.

Materials (7 decks)

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