Plastmassa va kauchuk ikkalasi ham uglerod va vodorod atomlaridan iborat, ularda kam miqdordagi kislorod, azot, xlor, ftor, supur va boshqa atomlar mavjud. Ular maxsus xususiyatlarga ega va foydalanadilar. Xona haroratida plastmassa mustahkam, juda qattiq va deformatsiya qilinmaydi. Kauchuk juda qiyin emas, elastik, cho'zilishi va cho'zilishi mumkin va cho'zish to'xtashganda asl shakliga qaytishi mumkin. Bu ularning har xil molekulyar tuzilmalari tufayli. Yana bir farq shundaki, plastik qayta ishlanishi va ko'p marotaba rezina ravishda qayta ishlanmasligi kerak. Uni faqat qayta ishlangan rezina ichiga ishlov berish mumkin, undan foydalanish mumkin, shuning uchun siz buni ko'rganingizda ularning yaqin munosabatlarini tushunishingiz mumkin. Kauchuk o'z xususiyatlari tufayli keng qo'llaniladi. Birinchidan,
Issiqlik o'tkazuvchanligi kauchuk - bu issiqlikning yomon o'tkazuvchisi. Uning termal o'tkazuvchanligi 2,2 ~ 6.28 w / m2 · {5}} k qalinligi 25 mm. Bu juda yaxshi issiqlik izolyatsiyasi materialidir. Agar kauchuk mikrolon yoki shimgichli holatga kelsa, uning issiqlik izolatsiyasi yanada yaxshilanadi va issiqlik o'tkazuvchanligi pasayadi, ulardan foydalanish paytida isterez yo'qotish tufayli issiqlik jazosiga olib kelishi mumkin, shuning uchun ularni isitish tarqalishiga e'tibor berish kerak.
② Thermal expansion Since there is a large free volume between rubber molecular chains, when the temperature rises, the internal rotation of its chain segments becomes easier, which will increase its volume. The linear expansion coefficient of rubber is about 20 times that of steel. This must be taken into account in the design of the vulcanization model of rubber products, because the linear size of the finished rubber product will be 1.2~3.5% smaller than the model. For the same type of rubber, the hardness and raw rubber content of the rubber compound also have a great influence on the shrinkage rate of the rubber compound. The shrinkage rate is inversely proportional to the hardness and directly proportional to the rubber content. The theoretical shrinkage rate of various rubbers is in the following order: fluororubber>silicone rubber>butyl rubber>nitrile rubber>chloroprene rubber>styrene-butadiene rubber>Tabiiy kauchuk, nima uchun kauchuk quvur armatura sanoatida asosiy xom ashyo sifatida tanlanadi. Kauchuk sanoat bugungi kunda jadal rivojlanayotgan bir paytda, dunyodagi kauchuk sanoatining savdosi 250 milliard AQSh dollaridan oshdi va rezina mahsulotlar xalqaro savdoda muhim tovarga aylandi. Jahon bozorida rezina buyumlar sanoat va qurilish mahsulotlariga yo'naltirilgan mahsulotlar guruhini tuzdi va kauchuk poyafzallar va lentalar, shuningdek tibbiy yordam, madaniyat va sport kabi har xil yirik toifalar bilan shug'ullanadi.