Natural roj hmab yog lub cev amorphous uas muaj peev xwm ua kom crystallize. Cov khoom siv ntuj (raw) - tsis muaj xim lossis dawb carbon. Cov roj hmab ntuj yog insoluble hauv cawv, dej, acetone thiab lwm yam kua. Nyob rau hauv cov tshuaj tsw qab thiab fatty hydrocarbons (ethers, benzene, roj av, thiab lwm yam), nws swells thiab tom qab yaj. Raws li qhov tshwm sim, cov kev daws teeb meem colloidal yog tsim, uas tau siv dav hauv cov kev xav tau.
Natural roj hmab muaj cov qauv molecular zoo ib yam. Cov khoom muaj cov yam ntxwv ntawm lub cev thiab thev naus laus zis, nws yooj yim ua tiav ntawm cov cuab yeej tsim nyog.
Natural roj hmab muaj lub siab elasticity (elasticity). Cov khoom muaj peev xwm rov qab tau nws cov duab qub thaum lub zog uas ua rau nws deformation tsis ua rau nws. Nws yuav tsum tau hais tias elasticity yog khaws cia nyob rau hauv ib tug ncaj dav kub ntau yam. Txawm li cas los xij, kev cia ntev ntev ua rau cov khoom tawv tawv.
Natural roj hmab ntawm qhov kub ntawm rho tawm ib puas thiab cuaj caum-tsib degrees yog pob tshab thiab nyuaj, ntawm qhov kub ntawm xoom mus rau kaum degrees- opaque thiab tsis yooj yim, ntawm nees nkaum - translucent, elastic thiab mos. Thaum rhuab saum 50˚C, cov khoom yuav ua yas thiab nplaum.
Nws poob nws qhov elasticity ntawm qhov kub ntawm ntau tshaj yim caum degrees, ntawm ib puas thiab nees nkaum degrees nws dhau mus rau hauv lub xeev cov kua resinous, tom qab hardening nws yog tsis yooj yim sua kom tau cov khoom qub. Thaum kub nce mus txog ob puas mus rau ob puas thiab tsib caug degrees, cov roj hmab ntuj pib decompose. Raws li qhov tshwm sim, ntau cov kua thiab cov tshuaj gaseous raug tsim.
Natural roj hmab yog dielectric zoo. Tsis tas li ntawd, cov khoom muaj roj tsawg thiab dej tsis kam.
Cov khoom siv yog maj mam oxidized los ntawm atmospheric oxygen. Cov txheej txheem sai dua nyob rau hauv cov tshuaj oxidizing tshuaj.
Ntxiv rau tag nrho lwm yam khoom, roj hmab muaj plasticity. Nws muaj peev xwm tuav tau daim ntawv uas nws tau txais los ntawm kev cuam tshuam sab nraud. Plasticity, uas manifests nws tus kheej thaum lub sij hawm machining thiab cua sov, yog suav hais tias yog ib tug ntawm cov yam ntxwv ntawm cov khoom. Vim tias cov roj hmab muaj cov khoom elastic thiab yas, nws tseem hu ua cov khoom siv plastoelastic.
Natural roj hmab, nws cov qauv yog (C5H8)n, suav nrog cov molecules uas muaj ntau ntawm ob daim ntawv cog lus. Cov khoom siv yooj yim nkag mus rau hauv tshuaj lom neeg nrog ntau yam tshuaj. Qhov nce reactivity yog vim tsis muaj tshuaj lom neeg ntawm cov khoom. Qhov zoo tshaj plawsKev sib cuam tshuam tshwm sim hauv cov kev daws teeb meem uas cov roj hmab tau sawv cev los ntawm cov molecules ntawm cov khoom loj loj colloidal.
Thaum ncab lossis txias, kev hloov pauv ntawm cov khoom mus rau lub xeev crystalline los ntawm amorphous (crystallization) tau sau tseg. Cov txheej txheem no tshwm sim nyob rau lub sijhawm, tsis yog tam sim ntawd. Crystals muaj qhov me me, cov duab geometric tsis paub meej, thiab lawv cov npoo yog fuzzy.
