1. Rubber a vulcanization .
Goodyear, American thil siam chhuaktu rethei tak chuan raw rubber chu a ideal material-ah a chantir a tum tlat a, chu chu elastic leh tough a ni bawk. rubber chu kum 30 chuang zet a ngaihven a, mahse a nun chu rethei takin a hmang a ni. Goodyear’s hometown: Goodyear zawn i duh em? Ngai teh, chutah chuan a awm! Rubber cap, rubber lined windbreaker, a hnuaiah rubber vest leh rubber pants a awm avangin. rubber boots leh rubber purse-ah chuan cent khat a awm lo. Goodyear gels chu magnesium oxide nen an pawlh a, lime water-ah an vawt a, nitric acid-ah an vawt a, a chung lam zawng zawng chungah sulfur-in an sprinkled a, chu chu nis, , , , dried on the sun, , , 3. Experiment-te chu a hlawhchham tawh a, raw glue, powdered sulfur, leh turpentine te chu crucible-ah a dah a, stove-ah chuan a siam palh a, accident-in, glue piece pakhat chu cauldron atang chuan a rawn chhuak a, meialh zingah a tla a, a kang a, mahse a sticky lo. Goodyear chu hlimna atan a zuang thla a, chu chu sulfur, heated what he waiting all day day a ni a, chu chu a ni.
Tunlai rubber factory-ah chuan hei hi vulcanization process. an ti a, chuta ṭang chuan raw rubber chu thil tangkai takah an chantir ta a ni. Goodyear-a vulcanization process chu a hnuah chemists-te chuan an chhut chhuak ta a ni: sulfur atoms built "bridges" between large molecular chains of raw rubber, as with the springs with twine} elastic but wire, elastic but whire, elastic but whire, elastic but whire,
2. Engtin nge rubber dum leh var dose a inthlak?
Rubber carbon black nena inhmeh chu a harh theih a, a chhe thei lo thei bawk. sole, rubber tire dum rawng dum chu carbon black. rubber dum carbon black tel lo, add white calcium carbonate, qin white powder filler. eraser pencil thumal te chu rubber dum hmanga siam theih chauh a ni a, pencil thumalte chu erase thei lo se, black mark} chu rubber-ah a awm lo a, chu chu rubber-ah chuan a awm lo a, chu chu rubber-ah chuan a awm lo a, chu chu rubber-ah a awm lo a ni. Khawtlang hmasawnna, tunlai hian rubber-a filler dah hian thil siamte chu rawng hrang hrang angin a lang thei a, chu chuan tunlai mite mamawh mimal mamawh phuhrukna chu rubber thil siam chhuahna atana hman theih a ni.