Black glass ceramic panel RFQs must state nominal thickness with tolerance, edge grind profile, corner treatment, cutout edge quality, and frame clearance—then require suppliers to confirm manufacturability against the approved drawing before price comparison.
Stove OEM mechanical teams and importer QA groups use these fields to keep black glass ceramic panels manufacturable across frame, gasket, and service-replacement interfaces. For CTE fields, see the black cooktop CTE RFQ guide; for durability metrics, see the durable cooktop RFQ checklist.
Thickness and edge finish are coupled in cooktop panel sourcing. A supplier may quote a nominal thickness that fits the frame rail—but fail the edge profile required for gasket compression, clip retention, or service replacement.
Industry cooktop glass-ceramic documentation such as SCHOTT CERAN technical details lists available thickness grades and discusses edge quality in the context of appliance assembly. Buyers should mirror that pairing in RFQs rather than treating thickness as the only mechanical field.
| If the RFQ specifies… | Also specify… | Risk when omitted |
|---|---|---|
| Nominal panel thickness | Thickness tolerance band | Frame bind or loose fit |
| Edge grind type | Edge location reference (which sides) | Wrong edge polished |
| Corner radius | Minimum edge distance to cutouts | Stress risers at corners |
| Cutout geometry | Cutout edge finish | Chip initiation in service |
| Frame clearance | Maximum bow / flatness | Clamping damage at edges |
Important: A bid that repeats “4 mm black glass ceramic” without tolerance band, labeled edge sides, and controlled drawing revision is not comparable with a quote that completes the coupling table above. — Source: SCHOTT CERAN technical details.
Thickness is not a single number on a cooktop panel. OEM drawings should carry nominal thickness, tolerance, measurement location, and any step or lamination note if applicable.
| Field | Example RFQ wording | Supplier must confirm |
|---|---|---|
| Nominal thickness | e.g., drawing callout at center zone | Grade availability |
| Tolerance | ± band per drawing | Process capability |
| Measurement method | Micrometer points / edge exclusion zone | Inspection record |
| Flatness / bow limit | Per drawing or internal spec | Reject criteria |
| Zone thickness map | If multi-zone layout differs | Conditional until CAD final |
| Weight implication | For shipping and handling | Optional packing note |
Datasheets such as the Eurokera Keralite sheet show thickness as a standard row for glass-ceramic grades. Request the same row for opaque black cooktop grades even when transmission is not relevant.
Pair thickness fields with thermal data from the durable cooktop RFQ checklist when the program also requires RTD/RTS evidence.
Edge finish controls how the panel meets the frame, gasket, and operator hands during service. Common RFQ terms include arrised, polished, or specified grind profiles—but the drawing must show which edges receive which treatment.
| Item | Specify on drawing | Why it matters |
|---|---|---|
| Edge grind profile | Polished / arrised / custom | Clip and gasket contact |
| Edge quality class | Chip, flake, and micro-crack limits | Service replacement acceptance |
| Corner radius or chamfer | R value per corner | Stress concentration |
| Edge-to-cutout distance | Minimum material ligament | Cracking under thermal cycle |
| Label side vs cook side | If silk-screen present | Edge handling in assembly |
| Protective film | Side and removal stage | Prevents edge damage in transit |
SCHOTT CERAN technical details discusses edge quality in cooktop applications. Use that language in supplier questionnaires; do not assume every black panel program shares the same edge class.
Burner openings, control cutouts, and cover-plate overlaps introduce inner edges with their own finish rules. An outer frame edge may be polished while an inner cutout still requires arrised edges to reduce initiation points.
| Interface | RFQ must include | Common failure |
|---|---|---|
| Burner hole | Hole diameter, position tolerance, inner edge finish | Cracks radiating from hole |
| Control slot | Slot radii and minimum wall thickness | Edge chipping during install |
| Cover plate overlap | Overlap width and thermal gap | Edge contact under expansion |
| Mounting clip pocket | Clip load direction and forbidden zones | Edge crushing |
| Ground path (if applicable) | Project-specific — request drawing note | Do not assume from color |
When the program includes cover plates, cross-check overlap and clearance fields with the cover plates OEM specification guide.
Request documents by name. Photos and marketing brochures do not replace inspection criteria.
| Document | Confirms |
|---|---|
| Material datasheet for quoted grade | Available thickness range |
| Drawing approval record | Revision-controlled geometry |
| Edge and cutout inspection standard | Visual and dimensional limits |
| Sample panel dimensional report | Thickness and flatness at agreed points |
| Thermal test summary | Separate block — see durability checklist |
| Packing and handling guide | Edge protection in transit |
Treat certificates and declarations as model-specific for the finished appliance—not automatic with a panel quote.
Most edge and thickness disputes trace to incomplete drawings or mixed revision quotes.
| Mistake | Field symptom | Prevention |
|---|---|---|
| Thickness only in email text | Supplier ships mid-tolerance band that binds frame | Put thickness on controlled CAD |
| “Standard polished edges” | Ambiguous sides polished | Label each edge on drawing |
| Cutouts added after quote | Inner edge chips in first production lot | Issue drawing revision before PO |
| Copying another SKU edge class | Clip geometry differs | Reference clip drawing with panel |
| Skipping flatness | Panel rocks in frame | Add bow limit or shimming rule |
| Mixing cooktop and cover-plate specs | Wrong overlap | Split RFQ blocks per component |
Route black glass-ceramic cooktop panel programs with a controlled drawing that includes thickness, tolerance, edge profile, cutout finish, and frame clearance to the black glass-ceramic cooktop product line when the application matches Kanger’s published black cooktop panel scope.
Do not default-route white, transparent fireplace, shaped concave, borosilicate oven-door, or tempered hood panels to the black cooktop line. Use the Products overview to select the correct material route, then attach the same thickness and edge tables from this article.
Submit drawing revision, edge inspection standard, target quantities, and required sample approval steps through Contact Kanger.
What thickness do black glass ceramic cooktop panels use?
Thickness is drawing-specific. Require suppliers to confirm availability against your nominal thickness and tolerance band—not a generic industry single value.
Should edge finish be specified on the panel drawing or the frame drawing?
Both interfaces matter. The panel drawing should show edge profile and cutout finish; the frame drawing should show clearance and clip loads that those edges must survive.
Can buyers request a different edge finish on reorder?
Only with a new drawing revision and sample approval. Edge process changes can alter stress distribution and inspection limits.
Does thickness affect thermal shock performance?
Thermal performance depends on material grade and test conditions, not thickness alone. Pair thickness fields with thermal metrics from the durable cooktop RFQ checklist.
How do cover plates change edge requirements?
Overlapping cover plates add inner edge exposure and clearance rules. Document overlap width and thermal gap in the RFQ and align with the cover-plates OEM guide.
When should importers reject a thickness and edge quote?
Reject when the supplier omits tolerance, edge profile, cutout finish, or drawing revision—or when sample dimensions fall outside agreed inspection points.
