| Glass Type |
Container material and manufacturing process |
Annealed soda-lime silicate glass specifically suitable for candle containers; avoid ordinary decorative glass without candle-use documentation. |
Request the material declaration, glass specification, and intended-use statement before approving the sample. |
Material documentation referencing ASTM F2179 or an equivalent candle-container specification, where applicable. |
| Finished Size |
External diameter, height, internal fill volume, and wall thickness |
Illustrative specification: 76 ± 1.0 mm external diameter, 85 ± 1.0 mm height, 250–270 mL nominal container capacity, and 3.0–4.5 mm wall thickness. |
Measure at least 5 samples using calibrated digital calipers and a graduated vessel or mass-volume method. |
All measured values fall within the approved drawing tolerances; record actual results rather than only “pass.” |
| White Appearance |
Color consistency, opacity, pinholes, stains, and coating coverage |
Use an approved master sample. An illustrative color target is CIE L* ≥ 92 with agreed a* and b* limits; the final target must be confirmed with the buyer because coating systems vary. |
Inspect under consistent neutral lighting and compare against the master sample; use a spectrophotometer for production lots when color matching is critical. |
No visible pinholes, bare glass, heavy orange-peel texture, color bands, or coating defects at the agreed viewing distance. |
| Thermal Resistance |
Resistance to heat generated during candle burning |
The complete candle system should pass the applicable candle-container and fire-safety evaluation; do not rely on a visual glass inspection alone. |
Conduct a controlled burn using the final wax, wick, fragrance load, fill level, lid, and vessel. Record burn time, flame behavior, soot, cracks, and leakage. |
No cracking, rupture, leakage, or hazardous flame behavior during the defined test protocol; retain dated photographs and test records. |
| Candle Safety Standard |
Fire-safety performance of the finished candle |
Use ASTM F2417 for candle fire-safety evaluation in the United States or EN 15493 for candle fire-safety requirements in applicable European markets. |
Test production-intent candles, not only empty vessels or laboratory prototypes. |
A signed laboratory or internal test report identifying the exact wax, wick, fragrance, vessel, and burn procedure. |
| Glass Container Specification |
Container suitability, annealing, and defect control |
Specify compliance with ASTM F2179 where relevant, together with limits for chips, cracks, sharp edges, stones, blisters, and excessive distortion. |
Inspect 100% of samples for critical defects and use a documented sampling plan for routine production. |
Approved inspection standard with defect photographs, defect classification, and lot-level inspection results. |
| Wax and Wick Compatibility |
Flame height, melt-pool behavior, soot, mushrooming, and vessel temperature |
Approve the wick only with the final wax, fragrance, dye, vessel diameter, and fill weight. A commonly monitored flame-height reference is approximately 25 mm, subject to the applicable test method and product design. |
Burn at controlled intervals and document the flame, melt pool, soot, wick stability, and any hot spots on the glass. |
Repeatable burn behavior across multiple samples with no sustained excessive smoking, unstable flame, or glass damage. |
| Fill Weight |
Net wax weight and fill-level consistency |
Set a product-specific nominal weight, for example 200 g, with a documented production tolerance such as ±3 g unless local labeling rules or the approved specification require a different tolerance. |
Weigh a statistically representative sample from each batch using a calibrated scale after the wax has fully set. |
Batch records show actual average, minimum, maximum, and standard deviation for net contents. |
| Fragrance and Chemical Compliance |
Fragrance documentation and restricted-substance control |
Request current SDS documentation and fragrance conformity information; verify allergen, restricted-substance, and market-specific requirements for the destination country. |
Check that the fragrance used in mass production is the same formulation approved during sampling. |
Traceable fragrance documents, batch numbers, and written change-control approval for any formulation substitution. |
| Labeling and Safety Instructions |
Warning label content, placement, legibility, and durability |
Use ASTM F2058 for relevant U.S. candle warning-label requirements or EN 15494 for applicable European candle safety information. |
Verify warning text, symbols, language, contrast, adhesive performance, and resistance to normal handling. |
Artwork approval record plus finished-product photographs showing the label in its final position. |
| Surface Coating Adhesion |
Resistance of white coating, printing, and decoration to rubbing |
Define a buyer-approved rub-test method, number of strokes, pressure, and visual pass criteria; use a recognized coating-adhesion method when appropriate. |
Test after curing and again after a controlled heat-and-humidity exposure representative of storage conditions. |
No flaking, exposed glass, major color transfer, or readable-print loss beyond the approved limit. |
| Dimensional Consistency |
Roundness, base stability, rim flatness, and lid fit |
Illustrative limits: diameter variation ≤ 1.0 mm, wobble ≤ 1.0 mm on a flat surface, and lid fit consistent with the approved sample. |
Measure at least 5 pieces per sampling point and test lids across the dimensional range, not only on average-sized vessels. |
Inspection report includes actual measurements and separates critical, major, and minor defects. |
| Packaging and Transit Protection |
Breakage rate, abrasion, carton strength, and internal protection |
Use individual separation, cushioning, and a tested master carton suitable for the planned shipping route; define a zero-tolerance limit for cracked or leaking finished candles. |
Perform a documented transit simulation or carrier-handling test on packed production-intent units. |
Packaging test record, carton configuration, drop or vibration results, and photographs of the packed load. |
| Production Quality Control |
Incoming, in-process, and final inspection controls |
Require documented inspection at glass receiving, coating or printing, wax filling, wick placement, labeling, packing, and final release. |
Review inspection frequency, calibrated-equipment records, nonconformance handling, and corrective-action history. |
Lot-specific inspection report with traceability from raw materials to finished cartons. |
| Pre-Production Approval |
Sample-to-mass-production consistency |
Approve a signed golden sample covering glass color, dimensions, finish, wax, wick, fragrance, label, fill weight, and packaging. |
Compare pre-production samples with the golden sample before authorizing the full run; approve any deviation in writing. |
Signed approval sheet, retained reference sample, revision-controlled artwork, and documented change-control process. |
