For borosilicate glass, aluminosilicate glass, fused quartz and other technical glasses, we carry out flat lapping, double-sided lapping, thickness setting and geometric correction to establish a stable thickness, TTV, flatness and parallelism datum for subsequent precision polishing.
Grinding is not simply making glass thinner; it is a controlled material removal process that establishes thickness, flatness and parallelism while leaving a uniform, controllable allowance for the next polishing step.
Even when a cut piece of glass already meets the length and width requirements, the two surfaces may still have thickness allowance, local high and low spots, wedge, surface damage and a non-uniform processed state.
If the next step is double-sided polishing, optical coating, wafer bonding, precision lamination or mechanical assembly, the grinding stage must establish a geometric foundation suited to that step in advance.
Thickness, TTV, parallelism and flatness are established first in the grinding stage. If geometric error is not controlled early, trying to correct it later with polishing alone is inefficient and can cause excessive local removal.
Flat lapping / single-side lapping / double-sided lapping / combinations of rough and fine grinding.
Finished thickness, TTV, parallelism, flatness and processing allowance.
Borosilicate glass, aluminosilicate glass, fused quartz, optical glass and other technical glasses.
Precision cutting, edge grinding and chamfering, polishing, cleaning and dimensional and surface inspection.
Typical parameters for engineering selection. Actual acceptance values are confirmed by material, dimensions, thickness and end use.
| Item | What the grinding stage focuses on |
|---|---|
| Workpieces | Glass substrates, discs, wafers, windows, strip parts and precision flat glass components |
| Thickness | Grinding thickness is controlled against the target finished thickness and the polishing allowance |
| TTV | Total thickness variation between measurement positions on the same piece of glass is controlled |
| Parallelism | Parallelism and wedge between the two main functional faces are controlled |
| Flatness | Grinding improves overall surface form and local high and low spots, establishing a uniform base for precision polishing |
| Grinding Stock | Grinding and polishing allowances are planned from the cut condition, initial thickness and final precision |
| Surface Condition | Obvious deep scratches, chipping, abnormal grinding marks and defects that would affect the next operation are checked |
| Subsequent operations | Precision polishing → cleaning → surface and geometric inspection → packaging |
Note: grinding and final polishing are different processing stages. Nanometre-level Ra, optical scratch/dig or final high-grade surface quality should be defined separately against the requirements of the polished part and are not directly equivalent to ground surface metrics.
Every step establishes a verifiable input state for the next operation.
Confirm the glass material, initial thickness, finished thickness, outline dimensions and downstream polishing requirements.
Remove the main processing allowance, establish the base thickness and correct obvious high and low spots left by earlier operations.
Further improve TTV, parallelism and flatness while reducing surface and subsurface damage left by rough grinding.
Check thickness, in-plane thickness variation and flatness, and confirm the remaining polishing allowance before the next operation.
If the thickness variation, flatness error or damaged layer after grinding is too large, the following polishing step has to remove more material, which not only takes longer but also increases the risk of further changes in local thickness and surface form.
A sound grinding target is therefore not about making the surface look shiny, but about using stable, uniform material removal to establish the geometric and surface base that precision polishing needs.
Rather than describing equipment, what matters is explaining the variables in the grinding process that genuinely affect finished-part quality.
Measuring centre thickness alone is not enough. For precision substrates, thickness variation between multiple measurement positions and the parallelism of the two surfaces matter just as much.
Abrasive grain size, lapping plate condition, pressure, speed, time and slurry condition all affect the material removal rate and in-plane uniformity.
Material removal during grinding creates micro-cracks and subsurface damage of varying severity. One task of fine grinding is to progressively reduce damage from earlier operations and avoid carrying damage that is too deep into the final polishing stage.
Materials differ in hardness, brittleness, chemical stability, original surface and thickness, and therefore respond differently to abrasive, pressure, removal amount and cycle time.
Commonly used for precision substrates, windows and technical glass parts. Processing requires coordinating thickness setting, TTV, edge condition and the polishing allowance.
Thin glass projects need more attention to fixturing, breakage, edge chips and local deformation generated during processing.
While balancing material removal efficiency, brittle damage, subsurface damage and downstream optical polishing requirements also need attention.
Many purchasing drawings list both grinding and polishing, but their roles in the process route are not the same.
| Item | Grinding / Lapping | Polishing |
|---|---|---|
| Main purpose | Establish thickness and geometric datum | Establish the final functional surface |
| Material removal | Relatively large | Relatively small |
| Core parameters | Thickness / TTV / Flatness / Parallelism | Ra / S-D / Flatness / Optical Surface |
| Surface state | Has a controlled grinding texture and is usually not the final transparent optical surface | Produces a transparent, high-quality or functional surface as required |
| Process position | After cutting / CNC | After fine grinding, before cleaning |
We plan the glass cutting route around dimensions, datums, edge condition and downstream operations, reviewing outline, cutting allowance and delivery requirements against the drawing.
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Grinding and polishing operations are arranged around thickness, parallelism, flatness and surface requirements, with the process route and inspection method confirmed per project.
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We control particles, residues and water marks after processing, and confirm cleaning, handling and packaging requirements against coating, bonding or assembly needs.
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Glass dimensions, edges and surfaces are inspected against the drawing and the agreed acceptance items, with inspection methods, sampling scope and delivery records defined.
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We address sharp edges and local edge defects after cutting, confirming edge grinding and chamfer styles and edge acceptance criteria against assembly requirements.
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For micro-holes, hole arrays and local openings in glass, we evaluate laser drilling options based on material, thickness and hole geometry.
View ProcessingProvide the glass material, length and width or diameter, initial thickness, finished thickness, quantity and drawing. If there are TTV, parallelism, flatness, Ra, scratch/dig, edge or cleanliness requirements, please note them as well.