280*34*17 Borosilicate Reflex Glass Gauge, Round Shape Borosilicate Sign Glass

• Principle: Reflex Glass Gauge
• Range: >0-30m
• Measurement Accuracy: ±3mm
• Accuracy: 0.1%
• Kind: Glass
• Structure: All in One
• Model NO.: borosilciate glass gauge
• Warranty: 5 Year
• Certification: CE, RoHS, DIN 7080
• Material: Borosilicate Glass
• Process Temperature: -40~300℃
• Size: 280*34*17 & Customized
• Reflex Glass: Borosilicate Glass
• Thick: 17mm
• Logo: OEM
• Standard: DIN7080
• Transport Package: Carton /Customized Package
• Specification: ISO9001, CCC
• Trademark: OEM
• Origin: Guangdong China
• HS Code: 7001000090
• Production Capacity: 10000PCS/Month

Product Description

Material 
Borosilicate glass
 
Main Composition 
1.SiO2: 80±0.5%
2.B2O2: 13±0.2%
3.Al2O3: 2.4±0.2%
4.Na2O (+K2O): 4.3±0.2% 
 
Chemical Property
1.Hydrolytic resistance       ISO719-HGB 1 Class
2.Alkali resistance              ISO695-HGB 2 Class
3.Acid resistance               ISO195-HGB 1 Class
 
Usage      
It is used in lever gauge in boiler for water position.
 
Product Category
1.Gauge glass mostly divide into these series:
Clear gauge glass 
Reflext gauge glass
  1) Three tendons (four grooves)
  2) Two tendons (three grooves)
2.It is also named:  
   Reflex Gauge Glass,   Sight glass,   Reflex Glasses
   Reflex sight glass,     Spares For level Gauge.
   
Physical Property     

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 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  diameter1mm mustnt be more 2. 2) The glass dont allow slag and scrap iron,etc. impurity. 3) Stripe : dont allow have palpable filaceous and pectinate stripe on the sight plane. 4) Cockle: In the side face,dont allow have the cockle of depth 1mm. 5) Crack: dont allow have crack. 6) Scrape: On the sight plane and in the 7.5mm to edge,the scrape of less than 10mm dont 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±1,then,put into the water of 20±1,it should not crack
6. Bend-resistance	≥80 MPa