







It’s made from Borosilicate, it is used in lever gauge in boiler for water position.
It is also named: Reflex Gauge Glass, Sight glass, Reflex Glasses
Reflex sight glass, Spares For level Gauge
The category is as follows:
1) Three tendons (four grooves)
2) Two tendons (three grooves)
3) Plan transparent 


Three tendons (four grooves)
:
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 ℃, Working pressure: 4.0MPa



Two tendons (three grooves)
:
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 ℃, Working pressure: 4.4MPa



Transparent plane
:
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 ℃, Working pressure: 8.0 MPa 
The material：Borosilicate Glass

Level Gauge Glass Physical Property 
Testing Item 
Standard Rules 
1. Appearance 
1) 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 Nosight plane. Their distance must be ＞40mm.
The air bubble of Diameter from 1.5mm to 2mm ≤3 on the Nosight 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 Lustre 
It should be no color and transparent，and with its self tine green is allowed. 
3. Waterresistance 
Cooked in the water for 5 hours，then weigh up ，then titration with 25ml 0~31 ug/g 
4. Alkaliresistance 
Cooked in the 0.5N NaoH for 3 hours，then Weigh up，weightlessness should be ≤75 mg/dm2 
5. Temperatureresistance impacts capability 
Put it into electric cooker，keep for 7min under the temperature of 260℃±1℃，then，put into the water of 20±1℃，it should not crack 
6. Bendresistance 
≥80 MPa 


