Product type: Glass Tube. Application: Chemistry. Model: 90650.
Overview
Clear Dm305 Dm308 Borosilicate Sealing Glass Sheet Alternative to 7052 Glass Plate: a precision glass plate / sheet made from Glass Tube. It is used in Chemistry. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.
Specifications
| Type | Glass Tube |
|---|---|
| Application | Chemistry |
| Color | Transparent |
| Model NO. | 90650 |
| Glass Type | Glass Tube |
| Materials | Borosilicate Glass |
| Coe | 5.0 |
| Applications | Sealing Glass |
| Alloy Grade | 4J29 / Kovar (Fe-Ni-Co Expansion Alloy) |
| Typical CTE | 48~52 ×10-7/ºC (20ºC~450ºC) |
| Sealing Type | Matched Hermetic Seal |
| Qualified Hermetic Performance | Helium Leak Rate ≤ 1×10-9Pa·m³/s |
| Glass Tubing | OD 3mm~120mm, wall thickness 0.5mm~12mm, standard length 1000mm/1200mm, cut-to-size available. |
| Glass Rod | Diameter 1.0mm~60mm, high precision round bar. |
| Glass Disc & Window Blank | Flat circular glass for vacuum viewport and observation window sealing. |
| Glass Bead & Insulator Preform | Custom precision preforms for feedthrough pin sintering and insulation sealing. |
| Special Shaped Blanks | Step tube, cone tube, envelope blanks and other custom structural glass parts. |
| Sample order | 1-3 working days delivery |
| Shipping method | Sea freight, air freight, international express (DHL/FedEx/UPS), railway transportation |
| OEM & ODM Customization | Support custom outer diameter, wall thickness, length, cutting, drilling, bending, printing logo and deep processing |
| Strict Quality Control | Full-process quality inspection, support third-party factory audit and product testing |
| Professional After-sales | 12-month warranty period, damage replacement support, solve product problems within 24 hours |
| Full-set Trade Documents | Provide CO, CIQ, commercial invoice, packing list and other export documents |
| One-stop Service | From design, production, processing to packaging and transportation, one-stop customized service |
| Supplier | Jinan Everest Glass Company Limited. |
Technical data
| Glass Grade | Type | CTE (20–300℃) ×10-7/℃ | Softening Point | Strain Point | Main Feature | Recommended Application |
| DM-305 | Matched seal hard glass | 47.5–49.5 | 710℃ | 510℃ | Perfect expansion match with Kovar; high insulation, clear transparent, good chemical resistance, mainstream domestic Kovar sealing glass | Hermetic feedthrough, vacuum envelopes, sensor headers, electron tube, laser components |
| DM-308 | Matched seal hard glass | 49.0–51.0 | 725℃ | 525℃ | Wider sealing temperature window, stable sealing process; alternative to 7052 | High-reliability electronic packaging, medical vacuum components, aerospace sensors |
| 7052 | Alkali borosilicate matched glass | 48.5–50.5 | 715℃ | 515℃ | International classic Kovar matched sealing glass | Export vacuum devices, industrial feedthrough, optoelectronic packaging |
| 8250 | Borosilicate sealing glass | 48.0–50.0 | 720℃ | 512℃ | Low X-ray absorption, excellent dielectric property | X-ray tube, photomultiplier tube, high-frequency vacuum device |
What to specify when you request a quote
- Material — listed as “Borosilicate Glass”; name the glass or quartz grade.
- Outline and thickness — give outline, thickness and tolerances.
- Holes, slots and features — listed as “Step tube, cone tube, envelope blanks and other custom structural glass parts.”; dimension every hole and its position tolerance on the drawing.
- Edges — state edge finish and chamfer.
- Surface — state polish and flatness where they matter.
Engineering guides for this part
For material grades and coating options, see Custom Borosilicate Glass Sheets Cut to Size: Precision and Performance. How parts like this are machined and finished is covered in Glass Wafer Cutting, Dicing, and Coring: Precision Manufacturing Process. For an application example, read Custom Ultra-Thin Glass Discs for Appliance Sensor Assemblies. Before sending a drawing, check Precision Glass Material Selection: Fused Silica vs Borosilicate & More. A related standard product is Custom Ultra-Thin Quartz Glass Disc.
FAQ
What is the Clear Dm305 Dm308 Borosilicate Sealing Glass Sheet Alternative to 7052 Glass Plate made of? expand_more
It is listed as Glass Tube. Other grades can be quoted if your application needs different transmission, thermal or chemical properties.
Where is this precision glass plate / sheet used? expand_more
Listed applications: Chemistry.
What should I include in a quote request? expand_more
Include material, outline and thickness, holes, slots and features, edges and surface, plus quantity and a drawing if the part is custom.
