Answer 13: PVC hose is originally very soft, because it contains plasticizer. However, plasticizer gradually flows out as the hose transfers oil or the hose exposed to the sun. Once the certain amount of plasticizer flows out, the hose turns hard.
Answer 13: PVC hose is originally very soft, because it contains plasticizer. However, plasticizer gradually flows out as the hose transfers oil or the hose exposed to the sun. Once the certain amount of plasticizer flows out, the hose turns hard.