While Singapore is not facing a shortage of medical supplies, disruptions to oil flows in the Middle East are tightening the supply of naphtha, a key feedstock for many everyday plastic items.  SINGAPORE: A key raw material used to make everyday plastic products – including medical supplies such as syringes and catheters – is facing supply uncertainty as tensions in the Middle East disrupt global oil flows. Naphtha, a petrochemical derived from crude oil, is widely used to produce plastics