Buyers searching for thermal shock test for candle jars are usually close to a supplier decision. The useful question is not simply who can quote, but which supplier can reproduce the approved package across production, decoration and delivery.
This guide focuses on how to agree a test method, sample plan and pass criteria before production. It is written for laboratory and QC teams preparing an RFQ, supplier comparison or production approval.
What a usable supplier offer must contain
Price only becomes useful when scope is fixed. Define the supplied set, the accepted reference and the delivery condition first.
Information to include in the RFQ
- Quantity for every size, color and artwork version.
- Drawing, dimensions or reference sample.
- Closure and accessory list.
- Logo files and physical color references.
- Retail and export packing.
- Destination, timing and trade term.
- Inspection and document requirements.
Questions for a supplier comparison
- Which production steps determine the stated MOQ?
- What evidence supports the promised lead time?
- How are color masters and approved artwork controlled?
- What protection is used between decorated units?
- What information will appear on carton and pallet labels?
How this topic changes the buying decision
how to agree a test method, sample plan and pass criteria before production. For a glass candle jar or holder project, this point should be converted into a drawing note, an approved sample feature or an inspection rule. If it cannot be checked, two suppliers may interpret the same request differently.
Ask the supplier to show the production step that controls this feature, identify the equipment or subcontractor involved, and explain what happens when a batch falls outside the approved range. That conversation reveals whether the quotation is supported by a repeatable process.
Why this issue deserves its own control
A test is useful only when its conditions represent the decision being made. Record sample conditioning, equipment, sequence, duration and pass criteria. Use production-representative units, not a carefully selected showroom sample. When product formula, temperature, orientation or pack-out affects performance, include those variables. A failed result should lead to root-cause work and a verified correction, not simply another unrecorded sample. Keep the report with the approved specification so future batches use the same method.
Product definition
| RFQ field | What to define |
|---|---|
| Use case | Wax type, wick plan, target burn profile and selling channel |
| Glass | Shape, nominal capacity, brimful capacity, weight and key dimensions |
| Opening | Inner and outer diameter, roundness and closure interface |
| Appearance | Glass color, surface finish, logo process and inspection standard |
| Components | Lid material, gasket, fit, finish and packed configuration |
| Validation | Approval sample, burn test responsibility and packaging test plan |
Process controls
- Write the test method, conditioning, sample quantity and pass criteria before testing begins.
- Use the real product formula and final assembled pack whenever contact or distribution can change performance.
- Keep photos, measurements and failed-sample notes so corrective action is based on evidence.
Sampling and quality plan
Order a representative sample that uses the intended glass, finish and mating components. The candle manufacturer remains responsible for wick, wax and burn validation in the selected vessel.
- Inspect glass and decoration separately before evaluating the complete set.
- Measure functional interfaces with suitable gauges.
- Trial the real filling and closing sequence.
- Review retail presentation after transport simulation.
- Issue a signed approval sheet with photos and unresolved points marked closed.
Buyer FAQ
Can one order contain several colors or designs?
MOQ depends on whether the buyer selects stock glass, custom decoration, special lids or a new mould. Request the minimum for every SKU and process.
Is a catalog sample enough for final approval?
Approve the complete jar-and-lid set and run the candle maker’s own burn program before commercial filling.
Which quotation assumptions should be written down?
A useful quote includes glass, finish, logo, closure, packing, quantity by SKU and the named trade term.
Next step
Keep the specification, approved samples and inspection criteria together as one project file. Buyers can review our product range and submit an RFQ when the required size, finish and components are defined.