Our overshoes and rubber shoes will wear hard and become brittle and easy to crack. This phenomenon is called aging of rubber. Rubber aging is a very complex problem. In general, oxidation, sunlight and high temperatures can cause rubber to age.
Ko te oko o te rapa ko Amerika ki te Tonga, ka kiia e nga roimata o te rohe, te mea nui, ko te ahua o te waikawa. Kaore i te tiketike, he ngawari ki te wawahi i te wera o te pāmahana, ka tiimata te hau o te raima. Te whakapiki kaha i te kaha o te rapa {{8} i roto i te tukatuka rapa, hei taapiri i te taapiri whakaraerae, he kaihoko taatai, he kaitao, he taapiri, he taapiri, he taapiri, he taapiri, he taapiri, me te taapiri, me te taapiri, me te taapiri, me te taapiri, me te taapiri.
Ko te ra kei roto i te maha o nga hihi ultraviolet, me te taapiri i te rahinga ka wehe i te ra o te rapa, i te wa o te whanariki. Te hua, ka ngaro te rapa i tona ngawari me te here intermolecular, na reira kua pakaru te kapiti .
Na reira, ka tukuna e koe nga huu me nga hiako, horoia kia maroke, ka tunua ki te hinu o te karawaka, ka huri i nga hu o te rapa.