Having a big scratch on your phone is like having an itch in your brain you just can't reach. Plus, it lowers the resale value of the device when you want to upgrade. A screen protector can keep the surface pristine, but buying one is more complicated than it should be. It's also worth asking if modern phones even need one anymore.http://www.yccscreenfilter.com/pet-screen-film/

Films made from PC are of high optical clarity, have excellent puncture resistance, and are heat sealable, but have low scratch and solvent resistance and tend to yellow when exposed to UV light for a prolonged time. Thus for more demanding applications, PC products have to be coated with a scratch and UV resistant layer for protection.http://www.teseidg.com/nbc-mes....h/industrial-filter-

Polyethylene terephthalate or PET belongs to the family of polyesters. It is widely used in everyday items and easily recyclable. It has a semi-crystalline form when stable. Most common application include rigid and flexible packaging as it is very light weight.http://www.pvcpetsheet.com/pet....-film-sheet/transpar

Based on wire material, the classification of dies are (FIG C4) Cemented carbide including Tungsten carbide (WC), Diamond single crystal natural (SCN) including single crystal synthetic(SCS) and polycrystalline(PCD), Ceramic including titanium carbide(TIC), titanium nitride(TIN) and cubic boron nitride(CBN).http://www.natust.com/drawing-....die/wire-drawing-die

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