Tire ni a matu raw material ni a manu rawt jat wa ai hte maren, n tara ai lam ni a manu rawt jat wa ai., galaw shapraw ai manu hpe shayawm na matu, n tara ai lam ni hpe galaw shapraw na matu rubber arung arai ni hpe jai lang ai lam hpe jat wa hkra galaw na matu hte, karum shingtau ai arung arai ni hpe jai lang ai lam hpe shayawm na matu, n tara ai lam ni hpe galaw shapraw na matu jai lang ai rubber arung arai ni gaw, madung hku nna, rubber n-gup n-gu n-gun hte seng ai rubber arung arai ni, hka n-gun n-gun ni hte seng ai rubber arung arai ni hpe madung tawn nna, n-gun dat ni hpe gram lajang na matu ra ai bungli langai rai nga ai. 1990 ning hta n kaja ai katsi ai hpe ninghkap lu ai, ozone hpe ninghkap lu ai hte nbung laru hpe ninghkap lu ai, dai gaw rubber arung arai ni a daw jau ai prat hpe grai hkra machyi shangun ai..
SUNNYJOINT EPDM gaw ethylene, propylene hte n-htuk n-htuk ai diene a n-gun kaji langai mi rai nna, n-gun n law ai rubber langai mi rai nna, NR. . NR{3}} hte shingdaw yang, n-gun n law ai n-gun n law ai rubber langai mi rai nga ai. n-gun n rawng ai. Masa lam nkau mi a npu e, NR hta EPDM langai ngai hpe bang ai gaw, rubber compound a galaw shapraw ai atsam ni hpe shatsaw ya lu ai sha n-ga, n-gun n rawng ai n-gun n-gun hpe ninghkap lu ai atsam hte nbung laru hpe ninghkap lu ai atsam hpe mung grai kaja hkra galaw ya lu ai.