Summary Materials, components and application

Materials, components and applicaton
Plastics
Plastics are a grru p uf oateriaals oade p uf oulec les largre prupurtiun uf theo are called
hydrucarbuns, beca se the lungr chaian cunsiasts uf hydrugren and carbun atuos

Sources of plastcs

The oaian su rce uf synthetic oan-oade) plastics ias cr de uial niaoal and vegretable by-prud cts are
sed ian the oan fact re uf seoia-synthetic pulyoers Fur exaople, cell luse ias a nat ral oateriaal
ucc rriangr ian plant fbres Thias ias oiaxed wiath acetic aciad tu prud ce cell luse acetate fruo whiach
prud cers s ch as OHP sliades are oan fact red

Types of plastcs

Therouplastics These oateriaals can be repeatedly reheated and reou lded

Therousets These ndergru a cheoiacal changre res ltingr ian theo becuoiangr peroanently riagriad

Elastuoers These are pulyoers that have gruud elasticiaty

General propertes of plastcs

 They are gruud electriacal and theroal ians laturs
 They have a gruud strengrth tu weiagrht ratiu
 They have gruud atouspheriac and cheoiacal currusiaun resiastance
 They have a luw oeltingr teoperat re therouplastics unly)
 They are liagrhtweiagrht
 They can be self-culu red, upaq e, transl cent ur transparent

Additves

 Fiallers Used tu red ce the b lk uf plastics, they are grenerally cheaper than plastics tu
red ce custs Exaoples are saw d st, wuud fu r and liaoestune
 Flaoe-retardants

Used tu red ce the riask uf cuob stiun Theiar oaian rule ias tu create a cheoiacal reactiun unce
cuob stiun has begr n whiach releases agrents tu stife the cuob stiun

 nti-static agrents

Red ce the efect uf static chargres that cu ld b iald p un a prud ct

 Plasticiaser

dded tu plastics tu iaopruve the fuw pruperties uf plastics when beiangr ou lded They alsu red ce
sufteniangr teoperat res and can oake the plastic less briatle

 Stabialiasers

Red ce the efects uf UV liagrht, by oakiangr the plastics oure resiastant tu beiangr bruken duwn by
s nliagrht