When you think of the screen protectors of old, you're probably thinking of TPU. TPU screen protector is a flexible plastic that's a huge hassle to install (it involves using a spray solution and squeegeeing out lots of bubbles), doesn't feel very smooth (thanks to its almost rubbery texture), and adds an "orange peel" type glare to your phone's screen. Still, it's flexible, so it can go edge-to-edge on any phone, it has better impact protection than PET, and it has limited "self-healing" powers for small scratches.

http://www.yccscreenfilter.com..../tpu-screen-protecto

With PC materials, many products like meshes for filter are also invented.
Filtration meshes and filter elements for process water filtration
Industrial filter meshes and filters from GKD are used in many different process stages and applications in the field of water filtration. The spectrum of filtration ranges from coarse filtration of > 1 mm right through to ultrafine filtration of 5 μm. The filtration mesh is selected on the basis of the respective mechanical requirements.
http://www.teseidg.com/nbc-mes....h/industrial-filter-

PET sheet like transparent PET sheet and matt rigid plastic PET sheet are commonly manufactured into bearings, pump parts, components for frames, tank lids, insulators, friction strips and control discs. Primarily used in mechanical engineering, marine engineering, electrical and food and pharmaceutical applications. PET sheet is also manufactured into any kinds of packaging, commonly into food packaging, such as clamshell, egg tray, salad packaging, etc.

http://www.pvcpetsheet.com/pet....-film-sheet/matt-rig

since it is a single crystal. It can be polish to very smooth finish with very low friction.Hardness and coefficient of friction of single crystal natural diamond dies vary with crystallographic orientation and results in increased die wear along certain crystallographic directions. Toughness is very poor for natural diamond as the diamond crystal has naturally weak points called cleavage planes where fracture occur easily .
http://www.natust.com/cnc-mach....ined-parts/stainless

A control valve receives the information from various sensors and transmitters in a control loop and processes that data to manage the control of the fluid parameter. The following figure shows a typical control loop for a control valve. There are many different types pf control valves, such as straight stroke control valve, single seat control valve, cage guided control valve, micro flow control valve, cryogenic control valve, bellow seal control valve, fluorine lined control valve, high pressure control valve, angle stroke control valve, ball control valve, etc.
http://www.lozosevalve.com/str....aight-stroke-control