Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
폴리에테르 술폰은 고온에서 우수한 내열성을 가지고 있습니다.pollieeteo sulpon-eun gooneseo usuhan naeyal-seong-eul gajigo issseubnida.Polyether sulfone has excellent heat resistance at high temperatures.