Raw Garden Checklist: Leak, Clog & Draw Consistency Benchmarks

Scope & compliance note

This checklist is designed for B2B wholesale buyers (procurement, QC, and warehouse receiving) who need repeatable, auditable incoming inspection for Raw Garden–style vape hardware. It focuses on hardware integrity and performance consistency only (no filling, no modification instructions).

Executive summary (what reduces returns fastest)

• Lock in a declared draw test regime (so “good draw” is measurable, not subjective).
• Use AQL-based sampling (accept/reject rules that scale to big lots).
• Screen leaks in two layers: fast mass-loss screen + confirmatory pressure/hold test.
• Predict clogs using airflow restriction trends and contamination checks (not “hope testing”).
• Make supplier actions easy with a failure-mode table, photos, and a one-page lot report.

1) Sampling plan (AQL): how many to test, and when to reject a lot

For wholesale receiving, avoid 100% inspection. Instead, use an acceptance sampling system indexed by AQL (Acceptance Quality Limit) so every lot has a documented sample size and accept/reject cutoff. Two common references are ISO 2859-1 and ANSI/ASQ Z1.4.

Lot definition (don’t mix variability)

• Define a “lot” by supplier + factory/line + date code/batch ID + carton ID range.
• If any of those change, treat it as a new lot (new sampling decision).

Defect classes (contract-aligned)

• Critical: unsafe / severe leak / non-functional hardware (commonly set to AQL 0).
• Major: clog/draw out of spec, intermittent leaks, high return risk.
• Minor: cosmetics/packaging issues not affecting function.

Table: AQL sampling plan (fill with your lot sizes)

2) Test setup (make results comparable across lots)

“Draw consistency” only works if your team always tests under the same declared machine conditions. A widely used baseline for aerosol-generation machinery is the 55/3/30 square-wave regime described in CORESTA CRM81 (also aligned with ISO 20768 standard conditions).

Declare your puff/draw regime in the report

• Puff volume, duration, interval, and puff profile (square/rectangular).
• Pressure-drop device used in-series (so ΔP comparisons are valid).
• Ambient conditioning (temperature band, preconditioning time).

Important caveat for high-airflow devices

CORESTA technical guides note that applying a “normal” 55 mL regime can overheat coils in some high-airflow devices, and that CEN has worked on regimes for those product types. If your hardware is high-airflow, document an alternate regime that represents real use without overheating. (Reference: CORESTA Guide No. 25 (July 2024).)

3) CTQ map (fast checks before functional testing)

Visual CTQs

• Seal seating, joint gaps, cracks, weld seams, mouthpiece fit.
• Intake hole uniformity and burrs; debris in airpath (borescope if available).
• Packaging damage (carton crush, blister deformation, loose units).

Table: CTQ dimensions & tolerances (your spec sheet)

4) Leak benchmarks (two-layer approach)

L1: Mass-loss leak screen (fast)

• Weigh units (pre).
• Standardize dwell time + orientation (upright / inverted cycles).
• Reweigh (post) and flag outliers beyond your mass-loss threshold.

L2: Pressure decay / hold test (confirm)

Use a fixture to apply a controlled pressure/vacuum and record decay over a fixed time window. This confirms whether a “mass-loss suspect” is a true leak and helps locate the failure mode.

Table: Leak failure modes & actions

5) Clog-risk benchmarks (predictive, not wishful)

C1: Airpath restriction trend (ΔP at fixed flow)

Measure pressure drop (ΔP) under your declared regime and watch the distribution. A “tight band” with low variability reduces the chance of customer complaints about “stuffy” draw.

C2: Intake consistency proxy

• Count/measure intake openings and check for burrs or partial blockage.
• Compare against your CTQ tolerance table (above).

C3: Contamination screen

• Borescope spot-check: debris, fibers, machining particles.
• Define “reject triggers” (e.g., any visible obstruction in critical airpath areas).

6) Draw consistency benchmarks (turn “feel” into data)

Draw consistency is best treated as a distribution problem: set a target ΔP band for “acceptable draw,” then control puff-to-puff stability (within a unit) and unit-to-unit variability (within a lot). CRM81 provides a clear way to declare puff volume, duration, interval, and profile so results can be compared across shipments.

Table: Draw consistency summary (sample record)

7) Warehouse receiving SOP (fast flow, no dock bottlenecks)

1. Document intake: PO, batch IDs, carton count, visible damage.
2. Quarantine: hold inventory until sampling disposition is complete.
3. Quick screen: CTQs + small leak screen subset.
4. Full test: leak confirm → clog-risk → draw consistency distribution.
5. Disposition: accept / conditional accept (retest) / reject (with report).

8) Data capture & one-page lot report (supplier-actionable)

• Lot identifiers: supplier, line/date code, carton range, receiving date.
• Test conditions: regime parameters, fixture IDs, calibration status, environment.
• Outputs: pass/fail by defect class, ΔP histogram summary, top failure modes (Pareto), photos.

9) Supplier RFQ & contract addendum (prevent repeats)

Must-have clauses

• AQL targets by defect class + switching rules (normal/tightened/reduced).
• DOA/returns policy (replacement SLA, credit terms, evidence requirements).
• Change control (materials/tooling/line changes require notice + pilot approval).
• Traceability pack with each shipment (batch list + QC sheet + carton IDs).

10) Corrective action playbook (when a lot fails)

1. Containment: stop-ship, quarantine, expand sampling.
2. Root cause: map failure to CTQs (seal fit, joint gap, debris, packaging crush).
3. Supplier CAPA: request measured before/after proof (not opinions).
4. Re-test rule: define when re-test is allowed vs. automatic rejection.

Printable wholesale QC checklist (copy/paste)

A) Receiving & traceability

• [ ] PO / batch IDs match cartons
• [ ] Packaging intact (no crush/warping)
• [ ] Lot defined and quarantined

B) Visual + dimensional CTQs

• [ ] Seal seating OK
• [ ] Joint gap within spec
• [ ] Intake geometry consistent

C) Leak tests

• [ ] Mass-loss screen pass
• [ ] Pressure/vac hold pass

D) Clog-risk signals

• [ ] Airpath restriction within band
• [ ] Contamination screen pass

E) Draw consistency

• [ ] ΔP within target band
• [ ] Puff-to-puff stability acceptable
• [ ] Unit-to-unit variability acceptable

F) Disposition

• [ ] Accept / Conditional / Reject recorded
• [ ] Photos attached + one-page lot report generated

FAQ (B2B)

What’s the fastest single test to reduce returns?

Start with a mass-loss leak screen and back it with a pressure/hold confirm test. Leaks are the most expensive failure mode because they create immediate DOA claims and damage adjacent inventory during transit/warehousing.

How do I set benchmark numbers if I have no history?

Begin with “golden sample” distributions under a declared regime, then tighten specs based on customer complaints and RMA reasons. Keep the method fixed so your data becomes comparable shipment-to-shipment.