1Pc Tempered Sight Glass Sheet Circle Observation Lens Dia. 140mm to 165mm Shade Cloth. Heat resistance temperature:<260℃. Chemical stability: water resistance <0.5mg/cm acid resistance<0.5mg/cm alkali resistance <0.5mg/cm. fishing tool. Resistance to hydraulic pressure: normal temperature and -10℃: 25kg/cm. byJuly 5, 2026