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do: frame materials > Plastics > Flashcards

Plastics Flashcards

0
Q

What are the materials in cellulose proportionate?

A

Proprionic acid/ cellulose chips / acetic acid / plasticiser

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1
Q

What are the raw materials in cellulose acetate?

A

Cotton linters / wood pulp / acetic acid

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2
Q

What are the raw materials used in cellulose nitrate frames?

A

Wood pulp/cotton linters/ nitric acid

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3
Q

What is the material percentages of carbon fiber?

A

60%nylon 20% carbon 20% other plastics

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4
Q

What is the softening temperature of cellulose nitrate?

A

65 degrees

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5
Q

What is the flashpoint of cellulose nitrate?

A

70 degrees

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6
Q

What identifies an Optyl frame?

A

15mm side re enforcements / Optyl logo

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7
Q

What are he advantages of Optyl frames?

A

High elasticity / lightweight / hypoallergenic

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8
Q

What is the advantages of nylon frames?

A

No joints/ lighter/ improved strength

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9
Q

What is Optyl made from?

A

Epoxy resin

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10
Q

What is the adjustment temp of ca?

A

57

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11
Q

What is the adjustment temp of Cn?

A

65 (flashpoint at 70)

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12
Q

What is the adjustment temp of proprionate?

A

67

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13
Q

What is the adjustment temp of pmma?

A

68

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14
Q

What is the adjustment temp of Optyl?

A

80-120

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15
Q

What is the adjustment temp of nylons and copolyamides?

A

Trick q they shouldn’t be heate as the have low temps and shrink when heated excessively.

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16
Q

What is the only thermosetting material?

A

Optyl and epoxied resins

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17
Q

What are nylon frames otherwise known as?

A

Polyamides

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18
Q

What are co Polyamides?

A

Polyamides can be mixtures of plastics / copolymers of different Polyamides/ copolymers of different plastics. (spx is one) some can be heated after mixing. Increasingly clear making them hard to identify.

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19
Q

What is a graduated colour called?

A

Two tone

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20
Q

What is the composition of Monel?

A

Similar to nickel silver 68% nickel / copper

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21
Q

How is nickel silver coloured?

A

Plated / coated

22
Q

How are titanium frames coloured?

A

Ion playing/ galvanic cladding

23
Q

How are aluminium frames coloured

A

Anodising

24
Q

How are rg frames plated?

A

Gold applied to the wire before drawing

mechanical plating

25
Q

What is electrolytic plating?

A

Metal is deposited by solution used when playing with gold/other metals

26
Q

What is a neutral density tint?

A

(Grey) Does not affect colour perception

27
Q

What colour tint for night driving?

A

Yellow amber contrast mar helps also

28
Q

What colour are contrast filters?

A

Sodium yellow/ amber

29
Q

What colour tints are used for bud and fluorescent lighting?

A

Blue/brown

30
Q

What is achromatopsia?

A

A specific inability to perceive colour image is read as black and white

31
Q

What tints are for achromatopsia?

A

Red orange amber yellow and neutral density.

32
Q

What tints are suitable for night driving?

A

Yellow /amber mar will do it anyway

33
Q

How are ac frames made?

A

Cut from sheet and routed. Extruded .injection moulding

34
Q

What are the advantages of ca?

A

Soft has a hight impact resistance. Natural feel

35
Q

What is pmma made of?

A

Acetone, sodium cyananide, methanol and sulphuric acid

36
Q

How are pmma frames made?

A

Routing used in nylon supras

37
Q

How are pmma frames coloured?

A

Lawyering over pale base colours

38
Q

What to look out for when adjusting pmma?

A

Must be exactly at 68 degrees as below is brittle and above blisters

39
Q

Advantages of pmma?

A

Rigid lightweight hard. But brittle has high lasting polish

40
Q

Advantages if aluminium

A

Strong very rigid lightweight tarnish resistant

41
Q

How would you repair aluminium?

A

Cannot be souldered or brazed very difficult to adjust.

42
Q

How are cf and cp frames made?

A

Injection moulding

43
Q

How are Optyl frames made?

A

Compression moulding

44
Q

What is the difference between gold plate and gold wash

A

Gold wash has a thinner layer of deposited gold and no platinum seal layer

45
Q

What is 12ct?

A

12 parts pure gold 12 parts alloy

46
Q

What is the makeup of Monel?

A

68% nickel 29%copper 1.25%iron 1,25%manganese

47
Q

What is the makeup of nickel silver?

A

60% copper 18% nickel 20% zinc and manganese

48
Q

What is polycarbonate used for on frames?

A

Side shields and non rx safety shields

49
Q

How are nylon frames made?

A

Injection moulding

50
Q

What does spx stand for?

A

Super polyamide x (derivative of nylon)

51
Q

What is there adjustment temp of polyamide?

A

95% but does shrink. Sides are fully reinforced to prevent this

52
Q

What is stainless steel composed of?

A

Iron 18% chromium 8%nickel

do: frame materials (3 decks)

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