FRAME MATERIALS

Question 1

Cellulose Acetate

Answer 1

Manufacturing;
-Formed into sheets
-Routed
-Tumbled

Facts;
-Brittle with age
-Blisters with heat
-Soak in acetone

Joint;
-Heat sunk

Question 2

Is cellulose acetate hypoallergenic?

Answer 2

NO

Question 3

Cellulose Nitrate (Normally supra)

Answer 3

Manufacturing;
-Cotton linters/nitric acid
-Routed sheets
-Reinforced sides

Features;
-Yellow with age
-Flashpoint 70 degrees
-Illegal

Joint;
-Pinned

Question 4

Is cellulose nitrate hypoallergenic?

Answer 4

NO

Question 5

Cellulose propionate (marked CP)

Answer 5

Manufacturing;
-Cellulose flakes/proprionic and acetic acid
-Injection moulded
-Reinforced sides

Features;
-Flexible
-Hard to adjust
-Heat causes shrinkage

Joint;
-Injected

Question 6

Is cellulose propionate hypoallergenic?

Answer 6

NO

Question 7

Stainless steel

Answer 7

Manufacturing;
-Wire drawn
-Welded
-Electroplated

Features;
-Easy to adjust
-Repair by welding
-Strong

Joint;
-Welded

Question 8

Is stainless steel hypoallergenic?

Answer 8

NO

Question 9

Plated metal

Answer 9

Manufacturing;
-Copper, nickel, zinc
-Soldered
-Electroplated

Features;
-Easy to adjust
-Easily corroded
-Not flexible

Joint;
-Soldered

Question 10

Is plated metal hypoallergenic?

Answer 10

NO

Question 11

Flexon

Answer 11

Manufacturing;
-Used for bridge and sides
-Laser welded
-Titanium body

Features;
-Can’t be repaired
-May flake
-Hard to adjust

Joint;
-Laser welded

Question 12

Is flexon hypoallergenic?

Answer 12

NO

Question 13

Aluminium

Answer 13

Manufacturing;
-Rivetted
-Used for sides only
-Anodised

Features;
-Re-rivet sides
-Stain resistant
-Hard to adjust

Joint;
-Rivetted

Question 14

Is aluminium hypoallergenic?

Answer 14

NO

Question 15

Nickel silver (small round)

Answer 15

Manufacturing;
-No silver
-Metal alloy
-Electroplated

Features;
-Retains shape
-Solder
-Easy to adjust

Joint;
-Soldered

Question 16

Is nickel silver hypoallergenic?

Answer 16

NO

Question 17

Acrylic (usually upswept supra)

Answer 17

Manufacturing;
-PMMA
-Routed sheets
-Not reinforced sides

Features;
-Rigid
-Brittle
-Laminated

Joint;
-Pinned

Question 18

Is acrylic hypoallergenic?

Answer 18

YES

Question 19

Nylon (sports)

Answer 19

Manufacturing;
-Injection moulded
-3D printed
-No side reinforcement

Features;
-Difficult to adjust
-Heat causes shrinkage
-Brittle

Joint;
-Injected

Question 20

Is nylon hypoallergenic?

Answer 20

YES

Question 21

SPX

Answer 21

Manufacturing;
-Super polyamide
-Injection moulded
-Reinforced sides

Features;
-Cold glaze
-Heat causes shrinkage
-Impact resistant

Joint;
-Injected

Question 22

Is SPX hypoallergenic?

Answer 22

YES

Question 23

Optyl (marked optyl or LCM)

Answer 23

Manufacturing;
-Compression moulded
-Epoxy resin
-LCM

Features;
-Brittle when cold
-Heat till pliable then hold
-Not flexible

Joint;
-Injected

Question 24

Is optyl hypoallergenic?

Answer 24

YES

Question 25

TR90

Answer 25

Manufacturing; -Crude oil -Injection moulded -No reinforcement Features; -Flame resistant -Heat slow -Cold glaze Joint; -Injected

Question 26

Is TR90 hypoallergenic?

Answer 26

YES

Question 27

Carbon fibre

Answer 27

Manufacturing; -Carbon filaments -Injection moulded -Metal sides Features; -Heat leaves fingerprints -Hard to adjust -Cold glaze Joint; -Injected

Question 28

Is carbon fibre hypoallergenic?

Answer 28

YES

Question 29

Turtle shell

Answer 29

Manufacturing; -Hawksbill shell -Layered plates -Pressure/steam Features; -Adjust in steam -Splicing -Easily broken Joint; -Metal to metal pinned

Question 30

Is turtle shell hypoallergenic?

Answer 30

YES

Question 31

Titanium

Answer 31

Manufacturing; -Laser welded -Polished in barrel -Buffed by hand Features; -Corrosion resistance -Easier to replace -Repair by brazing Joint; -Laser welded

Question 32

Is titanium hypoallergenic?

Answer 32

YES

Question 33

Rolled gold

Answer 33

Manufacturing; -Gold filled block -Hammered into wire -Form shape Features; -Easy to adjust -Repair by soldering -Tarnishes Joint; -Soldered

Question 34

Is rolled gold hypoallergenic?

Answer 34

YES