1) What to Verify on Arrival

1.1 Packaging, Labeling & Lot Identity

• Outer cartons: intact, dry, orientation/fragile labels, no odor/contamination. Capture photos of any shock/tilt indicators.
• Inner trays: count vs. packing list, protective caps/films present, no loose components.
• Lot data: supplier lot, mfg date, line/shift (if provided), and a traceable QR/2D on cartons & inner packs mapped to your receipt ID.

1.2 Sampling Plan (AQL)

Adopt an attributes acceptance sampling plan per ISO 2859-1 / ANSI-ASQ Z1.4^[1]. Use General Inspection Level II (default), switching rules for normal ↔ tightened ↔ reduced. Define defect classes upfront:

• Critical (CR): safety risks/total malfunction (e.g., exposed battery tabs, cracked insulators, severe leak path).
• Major (MA): functional failure (e.g., mouthpiece does not lock within torque window; ΔP out of spec).
• Minor (MI): cosmetic or small fit variance without functional impact.

2) Dimensional & Mechanical Checks

2.1 Gauging & Tolerances

• Critical dims: body OD, mouthpiece stem OD, seal-groove width/depth, connector length; verify against drawing tolerances (e.g., ±0.05 mm on mating features).
• Visual: burrs at mouth-contact, snap-fit cracks, flash at seals, thread damage, foreign particles.

2.2 Mouthpiece Fit & Torque Window

Use a calibrated torque driver. Define a closure window (e.g., 0.15–0.30 N·m for specific snap/quarter-turn designs—replace with drawing values). Record first-lock and re-lock torques; flag >10% CV as process variation.

2.3 Logistics Robustness

• Perform a light ISTA-style handling simulation (corner/edge/flat drops ≈ 76 cm on 1 carton); re-inspect random units for cracks/misalignment/loosened caps.
• After long transit, re-check airflow and sealing on cartons with most handling marks.

3) Airflow / Draw-Resistance & Sealing

3.1 Draw-Resistance Benchmark

Set a target ΔP at a defined flow/puff regime informed by e-vapour methods (e.g., CORESTA/CRM terminology)^[6]. Use a fixed fixture, tubing ID/length, and environment. Example ranges (illustrative):

Lock your own targets via field data, then validate bench repeatability (see Gage R&R).

3.2 Sealing / Leak Screening — Quantified

• Static vacuum hold: apply −3.0 ±0.2 kPa at the reservoir path for 30 s; acceptance: ≤150 Pa decay (illustrative—set your product limits).
• Mass-gain check: pre-condition at 25 °C/50% RH for 2 h; after a controlled preheat, no visible condensate in sensor cavity and mass gain <= 10 mg (fixture-dependent).
• Seal compression review: verify gasket compression set window (design-specific) and surface finish at leak paths (threads, press-fits).

4) Basic Electrical & Charging Safety

• OCV window: receive at 3.6–3.9 V typical (follow supplier spec); quarantine outliers.
• Internal resistance: spot-check to detect aging/damage; track mean & CV by lot.
• USB-C/PD behavior: verify charge current limit, termination voltage, and BMS protections (OCP/OTP/OVP). Document behavior with PD vs. non-PD adapters.
• Transport readiness: confirm UN 38.3 (T.1–T.8) reports for the exact cell/pack^[3] and apply current IATA DGR PI 965–970 when shipping by air^[4].

5) Documentation, Traceability & Materials

• COA alignment: metals/elastomers/plastics declarations aligned with RoHS and REACH duties (SVHC communication as required)^[5].
• Lot genealogy: supplier lot → IQC sub-lot → production order; store label/QR photos and carton anomalies.
• NCR/CAPA: defect class & counts, 8D actions, supplier response SLA (e.g., 5 business days).
• Change control: for material/tooling/firmware changes, request PPAP-style evidence or First Article with focused tests.

6) Measurement Quality (Gage R&R & Uncertainty)

Before locking any specification window (e.g., ΔP tolerance, torque), confirm the measurement system is capable:

• Gage R&R: aim for %StudyVar < 10% for critical characteristics; 10–30% may be acceptable with process controls. Document operators, parts, trials, and ANOVA results.
• Uncertainty budget: list dominant contributors (sensor accuracy, tubing losses, ambient), estimate combined standard uncertainty, and ensure tolerance >= 5× total measurement uncertainty for reliable decisions.
• Calibration: maintain current certificates for pressure sensors, flow meters, torque drivers, calipers/micrometers.

7) Downloadable Templates

Need editable versions? Reply to this post or contact your rep to receive:

• Incoming QC Checklist (.xlsx)
• Draw-Resistance Bench Record (.xlsx)
• NCR / 8D Template (.docx)
• Supplier Change Notification Intake (.docx)