Glass-metal sealing preforms

Private Enterprise "PROMSYSTEMS" produce preforms glass to metal seal of different standard sizes and shapes to order. They are used for the production: hermetics or millitary connectors with different standards (working temperature, hermetics, waterproof. etc). These are our standard based glasses with a coefficient of thermal expansions (Borosilicate, Soda-Lime, Titanium, etc): - 2.5-3.8 ppm/C; - 4.8-5.2 ppm/C; - 7.2-8.3 ppm/C; - 9.0-10.5 ppm/C; - In the production of glass preforms, we use glass of exceptional quality, in accordance with the regulatory and technical documentation for each brand; - Drawing must be attached. It is necessary to indicate with limit: 1. Outside diameter; 2. Inner diameter; 3. Height; For example: Preform (materials what you need) D1 = 3.2 +- 0.2mm, d2 = 1.4 + 0.2mm, h = 2.2 +- 0.2mm. We are reasdasdady to take on the development of new standard sizes from any glass at the expense of the customer;