CASE STUDY · Precision Glass Substrates

Glass Substrate Processing Case Study

We select substrate glass from the application conditions and manage dimensions, thickness, surface, hole positions, cleanliness and downstream process requirements as one set.

Project Overview

The complete route from material confirmation to finished-part delivery

Glass substrates are widely used in optics, displays, sensing, electronics and laboratory apparatus. Different applications place different emphasis on thermal expansion, transmission band, alkali content, thickness stability and surface condition, so material selection and downstream processing must be assessed together.

Typical materials: BOROFLOAT® 33, EAGLE XG®, fused quartz, alkali-free glass
Main operations: Cutting, drilling, edge grinding, lapping and polishing, cleaning
Control focus: Material matching, dimensions, thickness, surface and cleanliness
Applications: Optics, displays, sensing, electronics and laboratory equipment

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ENGINEERING GUIDE

The same outline can require different glass for different applications

Optical substrates care about transmission and surface; electronic thin-film substrates care about alkali ions, strain point and cleanliness; sensor packaging cares about thermal matching, hole positions and sealing; mechanical support substrates care about thickness, flatness and edges. Determine the function first, then choose the material and processing grade.

Applications

Where it can be used

Substrates for optical filtering, AR, reflective or functional coatings
Substrates for sensors, MEMS, microfluidics and electronic packaging
Substrates for displays, touch panels, thin-film electrodes and micro-heaters
Transparent supports in laser, imaging, analytical and inspection instruments
Laboratory slides, carrier stages, insulating plates and precision shims

Material Selection Logic

Why glass

Glass provides transparency, electrical insulation, chemical resistance, low gas permeation and a stable geometric interface. Different material systems match specific needs such as low alkali, low CTE, high temperature, UV, bonding or strengthening.

Material Selection

Common materials and their applications

Material	Applications	Selection focus
BOROFLOAT® 33	General heat-resistant, chemical-resistant and industrial precision substrates	Low expansion, wide specification range and good all-round machinability
EAGLE XG® / alkali-free glass	Display, thin-film, sensing and low-alkali electronic processes	Reduce ion migration while maintaining a high-quality surface
Fused quartz / JGS1	UV, laser, high temperature and low CTE	Confirm the spectrum, purity and internal quality
Aluminosilicate Glass	Thin, high-strength lids or structures	Can be combined with strengthening; grade and process must be matched
PYREX® Micro-Electro	Glass-silicon bonding and MEMS	Thermal matching, transparency and electrical insulation

Typical Parameters

Common enquiry parameters

Item	Common starting points or wording	Engineering notes
Outline	Length × width, diameter, R corners, holes and slots, and references	Determines equipment, assembly and layout
Thickness	From 0.10 mm thin plates to tens of millimetres thick	Affects stiffness, transmission, thermal stress and process time
Thickness tolerance / TTV	Graded by structural part, precision substrate or bonded part	Centre thickness does not replace in-plane thickness variation
Flatness / warp	Defined by effective area, support and measurement method	Affects coating, lamination, lithography and sealing
Surface quality	Defined separately for pristine, ground or polished faces	Different functional faces can use different grades
Holes and slots	Hole diameter, inlet/outlet, taper, pitch, position tolerance and hole-to-edge distance	Affects strength, assembly and cleaning
Cleanliness	Particles, residue, water marks and ions/metals (where applicable)	Must match the downstream process and inspection capability

Structure and Function

What it usually needs to look like

Available as rectangular, square, disc/wafer, ring, radiused or profiled outlines; mounting holes, micro-hole arrays, slots, windows, steps and chamfers can be added; surfaces can remain pristine, ground, polished or single-side ground.

Carry thin films, chips, electrodes, optical components or microstructures
Isolate electrical, chemical media, particles or the environment
Provide a transparent interface that can be coated, bonded or joined
Locate holes, devices, channels, optical paths and assembly references

Performance Requirements

Performance items recommended for confirmation

Material CTE, strain point, transmission, dielectric and alkali content
Outline, thickness, TTV, flatness and parallelism
Functional-face roughness, scratches and digs, and cleanliness
Holes and slots, edges, chamfers and local stress control
Material lot, inspection method and delivery traceability

Preparing Your Enquiry

Please provide in the drawing or enquiry

Application, working band, temperature and medium, material grade, size and thickness, holes and slots, references, TTV/flatness/parallelism, surface grade of both faces, downstream coating/bonding/lithography/strengthening, cleanliness, quantity and packaging.

The parameters above are for preliminary material and process selection and do not constitute a uniform guarantee for all dimensions, thicknesses and materials. Final specifications, measurement methods and delivery standards are governed by the drawing, samples and order documents confirmed by both parties.

Reviewing application conditions

Confirm operating temperature, band, chemical environment, thickness and downstream coating, bonding or assembly conditions.

Glass substrate processing and material preparation

Material and specification confirmation

Compare thermal expansion, transmission, mechanical and processing characteristics, and choose the appropriate grade and sheet specification.

Build-to-print processing and surface establishment

Complete cutting, hole positions, edges and necessary lapping and polishing, protecting critical functional faces.

Inspection and traceable delivery

Check dimensions, surface and cleanliness requirements against the drawing, and provide material and batch documentation as required by the project.

Start material selection and processing requirements from the same drawing

Send the drawing and key acceptance items and we will assess the project together with the material and process route.

Email Your Drawings Contact the Engineering Team