borosilicate sight reflex gauge glass

Price: 2.7 USD
Payment Terms: T/T,L/C,WU,Paypal
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Basic Info.
  • Brand Name: bright pearl 
  • Material: Borosilicate glass 
  • thickness: 17mm 
  • Application: bolier 
  • Working temperature: 260--500 °C 
  • Working pressure: 4-8.0MPa 
  • Model No.: reflex/plain 
  • Place of Origin: Hebei  
  • Min.Order: 50 Piece/Pieces
  • Means of Transport: Ocean, Air, Land
Supply Capacity
  • Production Capacity: 2000pcs per day
  • Packing:according customer requirement
  • Delivery Date: 5 days after received advance payment

Transparent plane borosilicate level gauge glass                   

Company information 

We are the professional factory of producing reflex and transparent borosilicate gauge glass. 

Now our products have been exported to Pakistan, Poland, Croatia, Malaysia, USA, Syria, Vietnam, Netherlands, UK, Bulgaria and so on. And we are keeping the long term cooperation relationship with our clients.

Production description 


Reflex glass is 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 °C, 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 °C, 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 ItemStandard 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 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  diameter2) 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.
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. Water-resistance

Cooked in the water for 5 hours,then weigh up ,then titration with 25ml    0~31   ug/g

4. Alkali-resistance

Cooked in the 0.5N NaoH for 3 hours,then Weigh up,weightlessness should be ≤75  mg/dm2

5. Temperature-resistance impacts capability

Put it into electric cooker,keep for 7min under the temperature of 260°C±1°C,then,put into the water of 20±1°C

6. Bend-resistance

≥80 MPa 

Packing & shipping

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Ms. kelly
Tel: 86-318-7095528
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Tongfeng industry co.,ltd
1-1-902,fuxingyuan,161#ronghua street , Hengshui, Hebei, China (Mainland)
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