parts of solar water heater (dust proof ring) Parts of Solar Water Heater (Dust-Proof Ring)Tube Specification Φ47/58mm1Material SiliconPackage 3000pcs/ctnCarton Size 600*330*300mmColor Black2Lead Time10 daysNote1.Diameter can be customized according to the specific requirements.2.White/Red color is also available or by specific requirements. Technical Data of Silicon Material Inspection Item Technical IndexDurometer Hardness(Shore A) 52 Tensile Strength 8 Elongation 429% Tear Strength 24 KN/M Density 1.18 Mg/m3Max Working Temperature 260