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reflex gauge glass,sight glass, reflex glass, borosilicate gauge glass,steam boiler glass, spares for level gauge it ismade from Borosilicate, it is used in lever gauge in boiler for water position. The category is as follows: 1) Three tendons (four grooves) 2) Two tendons (three grooves) 3) Plan transparent 4)Round glass Three tendons (four grooves) Size: 340 x 34(30) x 17mm 320 x 34(30) x 17mm, 280 x 34(30) x 17mm 250 x 34(30) x 17mm, 218 x 34(30) x 17mm, 190 x 34(30) x 17mm 165 x 34(30) x 17mm, 140 x 34(30) x 17mm, 115 x 34(30) x 17mm 400 x 34 x 17mm,370 x 34 x 17mm 300 x 34 x 17mm 400x 34x 17mm 370x 34 x 17mm 300 x 34 x 17mm The other size is optional or according to the requirements of customers. Working temperature: 260 °C, Working pressure: 4.0MPa Two tendons (three grooves) Size: 340 x 34 x 17mm 320 x 34 x 17mm, 280 x 34 x 17mm 250 x 34 x 17mm, 218 x 34 x 17mm, 190 x 34 x 17mm 165 x 34 x 17mm, 140 x 34x 17mm, 115 x 34 x 17mm 280×34×22mm, 280×28×17mm, 250×34×20mm, 250×34×22mm, The other size is optional or according to the requirements of customers. Working temperature: 260 °C, Working pressure: 4.4MPa Transparent plane Size: 340 x 34 x 17mm, 320 x 34 x 17mm, 280 x 34 x 17mm 250 x 34 x 17mm, 218 x 34 x 17mm, 216 x 34 x 17mm 190 x 34 x 17mm, 165 x 34 x 17mm, 215 x 34 x 22mm 218 x 38 x 23mm, 190 x 38 x 23mm, 165 x 38 x 23mm The other size is optional or according to the requirements of customers. Working temperature: 260 °C, Working pressure: 8.0 MPa Round glass Size: according to your requirements The material:Borosilicate Glass Level Gauge Glass Physical PropertyTesting ItemStandard Rules1. Appearance1) Air bubble: Diameter≤0.5mm,in the 10mm x 10mm area the quantity must be ≤3. Diameter from 0.5mm to 1.5mm dispersive air bubble,there is less 2 on the sight plane and less 5 on the No-sight plane. Their distance must be >40mm. The air bubble of Diameter from 1.5mm to 2mm ≤3 on the No-sight plane. Their distance must >40mm. On the sight plane, The distance to the side in 7.5mm,the air bubble of the diameter<1mm mustn’t be more 2. 2) The glass don’t allow slag and scrap iron,etc. impurity. 3) Stripe : don’t allow have palpable filaceous and pectinate stripe on the sight plane. 4) Cockle: In the side face,don’t allow have the cockle of depth .>1mm. 5) Crack: don’t allow have crack. 6) Scrape: On the sight plane and in the 7.5mm to edge,the scrape of less than 10mm don’t allow more 2 strips. 7) The sight plane must be polishing,and sealing side must be rubbing and polishing.2. Colour and LustreIt should be no color and transparent,and with its self tine green is allowed.3. Water-resistanceCooked in the water for 5 hours,then weigh up ,then titration with 25ml 0 31 ug/g4. Alkali-resistanceCooked in the 0.5N NaoH for 3 hours,then Weigh up,weightlessness should be ≤75 mg/dm25. Temperature-resistance impacts capabilityPut it into electric cooker,keep for 7min under the temperature of 260°C±1°C,then,put into the water of 20±1°C,it should not crack6. Bend-resistance≥80 MPa