Level gauge glass for steam boiler

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$1.50 - $4.20 / Pieces | 20 Piece/Pieces (Min. Order)
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Quick Details
Place of Origin:
Hebei, China (Mainland)
Brand Name:
Model Number:
Acid Etched Glass, Heat Absorbing Glass, Insulated Glass
Curve, Flat
Clear Glass
Level Gauge Glass
Level gauge glass
Supply Ability
Supply Ability:
8500 Piece/Pieces per Month
Packaging & Delivery
Packaging Details
1.Each one packed with paper box ,delivery with carton
2.Other package according to the customer's request

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

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.
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. 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,it should not crack

6. Bend-resistance

≥80 MPa