This guide addresses three procurement-critical questions:
- What glass type and color actually protect your formulation, and which “premium” options are just marketing?
- How do you match bottle neck finish to pump, dropper, or cap, and what causes the 5% leakage rate that no one talks about?
- How do you balance MOQ, customization depth, and per-unit cost when sourcing glass bottles from China?
If your supplier quoted “amber glass bottle, 30ml, screw neck” and stopped there, you’re missing the three specifications that decide whether your product survives filling, shipping, and a year on the shelf. A competent glass bottle manufacturer should specify glass type, neck finish code, and thermal shock resistance up front. This guide fills in what suppliers leave out — and if you’re wondering why choose glass for cosmetic bottles over plastic or acrylic alternatives, the short answer is chemical inertness, UV protection options, and premium shelf presence that no plastic can match.
1. Glass Types & Grades: What “Glass” Actually Means
Cosmetic glass bottles fall into two main categories: soda-lime glass (Type III) for standard applications and borosilicate (Type I) for premium or sensitive formulations. That distinction isn’t cosmetic. It drives chemical resistance, thermal shock tolerance, and how your formulation behaves at the 12-month mark. Knowing the types of glass for cosmetic bottles comes before every other sourcing decision: neck size, color, decoration, all of it.
How Are Glass Bottles Made? The Three Core Processes
The manufacturing method affects wall uniformity, neck precision, and ultimately whether your pump fits. Ask your supplier which process they use. Their answer tells you more about their factory than any sales deck.
Process 1: Blow-and-Blow (BB)
For narrow-neck bottles (neck diameter ≤30mm). A gob of molten glass drops into a blank mold, gets air-blown to form the neck finish, then takes a second blow in the finishing mold. BB produces consistent neck finishes, the kind you need for pump and dropper compatibility.
Process 2: Press-and-Blow (PB)
For wide-mouth jars and bottles. A plunger presses the glass parison into shape before the final blow. Wall thickness comes out more uniform than BB, which is why cream jars and wide-mouth serums almost always go this route.
Process 3: Narrow-Neck Press-and-Blow (NNPB)
A newer take on PB, adapted for narrow-neck bottles. Lighter bottles, more uniform walls. This is the dominant method for high-volume cosmetic glass production in China, but the capital investment is steep, so you’ll only find it at large-scale factories.
Glass Bottle Manufacturing Process Comparison
| Process | Best For | Wall Uniformity | Production Speed | Typical Factory Scale |
|---|---|---|---|---|
| Blow-and-Blow (BB) | Narrow-neck, small-volume (5–50ml) | Moderate | Medium | All factory sizes |
| Press-and-Blow (PB) | Wide-mouth jars, 30ml+ | Good | Medium | Mid to large |
| NNPB | High-volume narrow-neck, 30–250ml | Excellent | High (IS machine) | Large scale only |
Sourcing note: If a factory runs BB for your 100ml lotion bottle, they’re likely a smaller operation working with older tooling. That affects wall uniformity, drop-test performance, and color consistency once you scale past 50,000 units. Doesn’t mean they’re bad. Just know what you’re buying.
Table 1: Glass Type Comparison for Cosmetic Applications
| Glass Type | USP/EP Class | Chemical Resistance | Thermal Shock Resistance | Typical Use in Cosmetics | Relative Cost (vs Type III = 1.0) |
|---|---|---|---|---|---|
| Type III — Soda-Lime | USP Type III | Moderate (good for most formulations with pH 4–8) | Low (ΔT ≤ 40°C) | 80%+ of cosmetic bottles: serums, lotions, toners | 1.0 (baseline) |
| Type II — Treated Soda-Lime | USP Type II | Improved (sulfate surface treatment reduces alkali extraction) | Low (same as Type III) | Slightly acidic formulations; cost-sensitive exports to EU | 1.1–1.2 |
| Type I — Borosilicate | USP Type I | Excellent (near-zero alkali extraction) | High (ΔT ≤ 120°C) | Active-ingredient serums, pH <3.5 or >9, essential oils | 2.5–4.0 |
| Type I — Neutral Glass (Fiolax®-type) | USP Type I | Excellent | High | Premium perfume, pharmaceutical-grade skincare | 3.0–5.0 |
Budget guidance: Unless your formulation hits pH <3.5 or contains essential oils above 10% concentration, Type III soda-lime glass handles the chemistry fine. The performance gap between Type III and Type I shows up in lab testing at 24+ months, but at 12 months on a store shelf, consumers can’t tell. Put that budget into UV-protective color instead.
1.1 Glass Color & UV Protection
Glass color is your first line of defense against photo-oxidation. Essential oils, vitamin C serums, retinol products, all degrade under UV exposure (290–400 nm).
| Color | UV Transmission (290–400 nm) | Best For | Cost Premium (vs Clear) | Notes |
|---|---|---|---|---|
| Clear (Flint) | 85–92% | Products with stabilizers; display-focused packaging | 0% (baseline) | Requires secondary packaging (box) for UV protection |
| Amber | 8–15% | Essential oils, vitamin C, antioxidants | +5–10% | Best overall UV protection; industry standard for aromatherapy |
| Cobalt Blue | 20–35% | Premium skincare, marine-themed products | +8–15% | Better shelf impact than amber; slightly less UV protection |
| Green (Forest) | 25–40% | Herbal products, organic positioning | +8–15% | Least UV protection of the colored options |
| Violet (Purple) | 15–25% | Premium essential oils, “energy” positioning | +15–25% | Blocks UV-A effectively; allows some visible light (preserves product color) |
| Frosted (Acid-Etched) | Depends on base color | Premium skincare, minimalist brands | +20–40% | Surface etching reduces clarity; can weaken glass by 5–10% — verify drop-test results |
Batch consistency warning: Amber glass from Chinese factories sometimes has high iron-oxide variability between production runs. If your brand identity depends on a specific amber shade, specify a Pantone reference for the glass color, not just “amber”, and request ΔE ≤2.0 across batches. Some buyers learn this the hard way after receiving three slightly different shades in one shipment.
2. Neck Finishes: The Most Misunderstood Specification
The neck finish determines which pump, dropper, cap, or sprayer fits your bottle. A “24/410” pump will not fit a “24/400” bottle. The thread pitch and neck height are different standards, not tolerance variations. This mismatch is responsible for more leakage complaints than any other single spec error.
Table 2: Cosmetic Glass Bottle Neck Finish Reference
| Neck Code | Outer Diameter (mm) | Thread Type | Common Bottle Sizes | Compatible Closure Types |
|---|---|---|---|---|
| 13mm Crimp | 13.0 ±0.2 | Crimp (aluminum ferrule) | 5–15ml perfume | Perfume pump (crimp-on) |
| 15mm Crimp | 15.0 ±0.2 | Crimp | 15–30ml perfume | Perfume pump (crimp-on) |
| 18mm Crimp | 18.0 ±0.2 | Crimp | 30–50ml perfume | Perfume pump (crimp-on) |
| 18/400 | 18.0 ±0.2 | Screw (single-start) | 15–30ml serum, essential oil | Dropper cap, disc-top cap, lotion pump |
| 20/410 | 20.0 ±0.2 | Screw (single-start) | 30–50ml treatment | Fine mist sprayer, dropper, lotion pump |
| 24/410 | 24.0 ±0.25 | Screw (single-start) | 50–120ml lotion, toner | Lotion pump, disc-top cap, trigger sprayer |
| 24/415 | 24.0 ±0.25 | Screw (deeper thread) | 50–100ml premium | Same as 24/410 but more thread engagement |
| 28/400 | 28.0 ±0.3 | Screw | 100–250ml body care | Trigger sprayer, lotion pump (high output) |
| 28/410 | 28.0 ±0.3 | Screw | 200–500ml large format | Trigger sprayer, foam pump |
The leakage culprit: Most leakage in glass bottles traces back to neck flatness, not thread mismatch. If the bearing surface (the top rim of the neck) isn’t perfectly flat, the cap liner can’t seal. Request a neck flatness gauge test report. Acceptable tolerance is ≤0.15mm deviation across the rim.
2.1 Crimp-On vs Screw-On: Which to Specify
| Dimension | Crimp-On (Ferrule) | Screw-On (Threaded) |
|---|---|---|
| Seal reliability | Excellent (permanent mechanical bond) | Good (depends on torque consistency) |
| Consumer experience | Premium (requires tool or is permanent) | Convenient (removable for refill) |
| Filling line requirement | Crimping machine required | Standard filling line |
| Refill/recycling | Difficult (ferrule must be cut) | Easy (unscrew) |
| Cost per unit | +$0.008–0.015 (ferrule + crimping) | 0% (baseline) |
| Best for | Perfume (13/15/18mm crimp) | Skincare, body care (screw necks) |
For perfume bottles, crimp-on is the global standard. Screw-on perfume pumps exist but you won’t see them in premium positioning. For skincare serums, screw-on 18/400 or 20/410 dominates because consumers expect to refill or replace the dropper.
3. Bottle Sizes & Capacity Matching
Table 3: Glass Bottle Size × Application Matrix
| Capacity | Common Neck Size | Typical Product Types | Fill Weight (approx, water) | Per-Unit Cost (China, 10K order) | MOQ (standard color) |
|---|---|---|---|---|---|
| 5ml | 13mm crimp | Perfume sample, oil serum | 5g | $0.12–0.20 | 10,000 |
| 10ml | 15mm crimp or 18/400 | Essential oil, eye serum | 10g | $0.15–0.25 | 10,000 |
| 15ml | 18/400 | Facial serum, facial oil | 15g | $0.18–0.30 | 5,000 |
| 30ml | 18/400 or 20/410 | Serum, toner, essential oil | 30g | $0.22–0.38 | 5,000 |
| 50ml | 20/410 or 24/410 | Lotion, cream (wide-mouth), toner | 50g | $0.28–0.48 | 5,000 |
| 100ml | 24/410 | Body lotion, toner, shampoo | 100g | $0.42–0.70 | 5,000 |
| 120ml | 24/410 | Lotion, body wash | 120g | $0.48–0.80 | 10,000 |
| 200ml | 28/400 or 28/410 | Body lotion, body wash | 200g | $0.70–1.20 | 10,000 |
| 250ml | 28/410 | Body care, shampoo | 250g | $0.85–1.50 | 10,000 |
Glass bottle pricing is brutally volume-sensitive, and ocean freight is the reason. A 40HQ container fits 80,000–120,000 pieces of 30ml bottles depending on individual packaging. Orders under 10,000 pieces often cost 30–50% more per unit because they ship by air or LCL. For buyers searching where to buy wholesale glass bottles in smaller quantities, expect to pay that premium, or consolidate with other SKUs to fill a container.
For those looking for specific capacities: if you need where can i find 8 oz glass bottles wholesale (roughly 240ml), expect 28/410 neck and MOQ around 10,000. Where can i buy 12 oz glass bottles wholesale (approximately 350ml) and where can i buy 16 oz glass bottles wholesale (approximately 475ml) are less common in cosmetics. These sizes skew toward food and beverage packaging, and you may need to source from a general glass container manufacturer instead of a cosmetic specialist.
4. Dropper Caps & Pump Compatibility
Glass bottles for skincare and essential oils almost always need a matching dispensing closure. Three types dominate.
4.1 Dropper Caps (Pipette)
| Component | Material Options | Specs to Verify | Failure Mode |
|---|---|---|---|
| Bulb | Natural rubber, TPE, nitrile, silicone | Rubber type must be oil-resistant for essential oils | Bulb degrades in 3–6 months with essential oils (unless nitrile/silicone) |
| Dip Tube | Glass (premium), PP (standard) | Length: should reach within 3mm of bottle bottom | Glass tube breaks if bottle tips; PP tube may kink |
| Cap | PP, ABS | Must match neck finish (18/400, 20/410, etc.) | Cross-threading if cap mold tolerance is poor |
Material mistake to avoid: For essential oil dropper caps, natural rubber bulbs are a ticking failure. Essential oils dissolve natural rubber within 3–6 months, leaving particles in the product. Specify nitrile (oil-resistant, black) or TPE/silicone (clear or colored). Cost premium: $0.02–0.05/unit. That’s trivial compared to a product recall.
Internal link: Browse our full Glass Bottles category for coordinating pumps and caps.
4.2 Lotion Pumps on Glass Bottles
Lotion pumps on glass need a different closure design than plastic bottles. Glass neck threads can be less precise, so you need to pay attention to three things:
- Closure liner material: PE foam liner is standard. For low-pH formulations, upgrade to PVDC-coated liner.
- Closure torque range: 8–12 inch-pounds for 24/410 on glass. Over-torque and the glass neck cracks.
- Dip tube length: Cut to bottle inner height minus 3–5mm. Too short and product wastes at the bottom; too long and it kinks.
4.3 Fine Mist Sprayers on Glass Bottles
Fine mist sprayers for glass bottles (perfume, facial mist) require precise actuator orifice sizing. Buyers often ask where can i buy glass spray bottles or where to buy glass spray bottles. The answer depends on your required spray pattern:
- Facial mist: 0.15–0.25mm orifice, 50–80 mcl per stroke
- Perfume: 0.12–0.20mm orifice, 30–50 mcl per stroke
- Setting spray: 0.20–0.30mm orifice, 80–120 mcl per stroke
For volume buyers searching where to buy glass spray bottles wholesale or where can you buy glass spray bottles, work directly with a glass bottle manufacturer who can coordinate both bottle and sprayer. Mismatched orifice sizes produce either a stream instead of a mist, or a fine mist that clogs after 50 strokes.
5. Sourcing & MOQ: Glass Bottle Procurement Reality
Table 4: Supplier Capability Comparison — Glass Bottles
| Capability Dimension | Large-Scale Glass Factory (Xuzhou-type) | Mid-Tier Trading Company | Premium Export Specialist |
|---|---|---|---|
| Annual Output | 200–500 million bottles | 20–80 million bottles | 5–30 million bottles |
| Typical MOQ (standard stock mold) | 10,000–30,000 | 5,000–10,000 | 3,000–5,000 |
| Custom Mold Cost | $500–1,200 | $800–2,000 | $2,000–5,000 |
| Sample Lead Time | 15–20 days (new mold) | 10–15 days | 7–10 days |
| Production Lead Time | 30–45 days | 25–35 days | 20–30 days |
| Color Consistency (ΔE) | ≤3.0 | ≤2.0 | ≤1.5 |
| ISO 9001 | Usually yes | Often yes | Always yes |
| Drop Test Report | Basic (1m drop, concrete) | Standard (1.2m, 3 surfaces) | Full (angle-specific, regulated) |
| Recycling Cert (GRS) | Rare | Sometimes | Often available |
| Cost per Unit (30ml amber, 10K order) | $0.15–0.25 | $0.22–0.38 | $0.35–0.60 |
Glass factories in Xuzhou (Jiangsu Province) produce an estimated 60%+ of China’s cosmetic glass bottles. The scale advantage is real, but quality can slip across large runs (500,000+ pieces) if furnace temperature isn’t actively managed. For orders above 50,000 pieces, request a mid-run quality check at the 250,000-piece mark in addition to pre-shipment inspection.
5.1 MOQ by Customization Level
| Customization Level | MOQ | Mold Cost | Lead Time (after approval) | Cost Premium (vs stock) |
|---|---|---|---|---|
| Stock mold, standard color | 5,000–10,000 | $0 | 25–35 days | 0% (baseline) |
| Stock mold, custom color (masterbatch) | 10,000–20,000 | $0–200 | 30–40 days | +5–12% |
| Custom mold (new shape) | 30,000–50,000 | $500–2,000 | 45–60 days | Negotiable (amortized) |
| Custom surface (frosting, printing) | 10,000+ | $100–500 (screen plate) | +7–10 days | +15–30% |
| Custom decoration (hot stamp, label) | 5,000+ | $50–300 (plate/die) | +5–7 days | +10–25% |
When evaluating where to buy wholesale glass bottle orders, look for a GMP certified bottle manufacturer or a supplier with ISO 22716 cosmetic packaging certification. These credentials don’t guarantee quality, but their absence is a red flag, especially if you’re exporting to regulated markets like the EU or US.
6. Quality Control: What to Specify in Your PO
Glass fails catastrophically. Plastic deforms before it breaks; glass shatters. The QC specs below are non-negotiable for cosmetic glass bottles.
Table 5: QC Specification Checklist for Glass Bottles
| Test | Method | Acceptance Criterion | Why It Matters |
|---|---|---|---|
| Dimensional accuracy | Caliper (neck OD, neck height, total height) | Neck OD: ±0.2mm; Height: ±0.3mm | Pump/cap fit depends on neck accuracy |
| Neck flatness | Feelergauge or optical flatness tester | ≤0.15mm deviation | Uneven neck = leakage |
| Droop test | 1.2m free-fall onto concrete, 3 orientations | 0% breakage (or per agreed AQL) | Shipping survival |
| Thermal shock | ΔT = 40°C (8°C → 48°C, 10 min each) | 0% crack | Hot-fill or dishwasher exposure |
| Internal stress (Polariscope) | Polarized light inspection | Stress level ≤ Level 3 (ISO 8422) | High stress = spontaneous breakage |
| Chemical resistance | USP <660> or EP 3.2.1 | Meets Type III (or specified type) | Formulation compatibility |
| Color consistency | Spectrophotometer (ΔE) | ΔE ≤2.0 (standard); ≤1.0 (premium) | Brand consistency |
| Weight tolerance | Individual weighing, random sample | ±3% of nominal weight | Light bottles = thin walls = breakage risk |
The test nobody runs: Request a polariscope test report for every new glass bottle mold. Internal stress from uneven cooling is invisible to the naked eye, but it causes spontaneous breakage 2–8 weeks after filling. The test costs $50–100. A bottle-breakage incident in the market costs you the customer, the review, and possibly the retail account.
6.1 Related: How to Sterilize Plastic Cosmetic Bottles
While this guide focuses on glass, buyers often source both materials. If you’re also working with plastic bottles and need to know how to sterilize plastic cosmetic bottles, the method depends on resin type: PP and PET tolerate autoclaving at 121°C for 15 minutes; PETG deforms above 70°C and requires UV-C or ethylene oxide treatment. Glass bottles, by contrast, withstand dry heat sterilization at 160–180°C without deformation — another reason glass remains the preferred choice for sensitive formulations.
7. Perfume Bottles: A Special Case
Perfume bottles have the most complex neck-finishing requirements in cosmetic packaging. They deserve separate treatment.
7.1 Perfume Bottle Neck Types
| Neck Type | Diameter | Closure Type | Market Standard |
|---|---|---|---|
| 13mm Crimp | 13.0mm | Crimp-on perfume pump | Mini perfume (5–10ml) |
| 15mm Crimp | 15.0mm | Crimp-on perfume pump | Standard perfume (15–30ml) — most common |
| 18mm Crimp | 18.0mm | Crimp-on perfume pump | Large perfume (30–50ml) |
| 20mm Crimp | 20.0mm | Crimp-on perfume pump | Luxury large format (50ml+) |
7.2 Perfume Pump Specifications
| Parameter | Standard Range | What to Specify |
|---|---|---|
| Dosage | 30–80 mcl per stroke | 50 mcl is industry standard for eau de toilette; 30 mcl for parfum |
| Actuator type | Screw-on collar vs snap-on | Screw-on is more secure; snap-on is faster assembly |
| Collar finish | Gold, silver, black, custom | Metallized collar is +$0.05–0.12/unit |
| Overcap | PP, ABS, metal | ABS overcap feels premium; PP is cost-effective |
Internal link: Explore our Glass Perfume Bottles category to coordinate bottle and pump.
7.3 How Do You Fill a Little Glass Sample Bottle?
For 5–10ml perfume sample bottles with crimp-on pumps, filling requires a benchtop crimping machine (manual or semi-automatic). Fill the bottle to 85–90% capacity, insert the pump with ferrule, and crimp at 0.3–0.5 MPa. Over-crimping deforms the ferrule; under-crimping causes the pump to pop off under pressure. For screw-neck sample bottles (18/400), hand-tighten to 8 inch-pounds — no tools needed.
8. Sustainable Glass: PCR, Refillable & Lightweighting
8.1 PCR (Post-Consumer Recycled) Glass
PCR glass content is increasingly demanded by EU regulations (PPWR — Packaging and Packaging Waste Regulation). Key facts:
- PCR content available: 10%, 30%, 50%, 100% (cosmetic-grade, color-sorted)
- Color limitation: PCR glass is typically available only in amber, green, or mixed (brownish). Clear PCR glass is technically possible but expensive — it requires optical sorting.
- Cost premium: +8–20% vs virgin glass
- Aesthetic impact: PCR amber has slightly higher color variability than virgin amber (ΔE 2.0–3.0)
8.2 Refillable Glass Design
Refillable glass bottles require:
- Durable decoration: Frosting or screen printing — not adhesive labels that peel with water exposure
- Removable pump/cap: Screw-on, not crimp-on
- Wide mouth (optional): Facilitates consumer refilling
8.3 Lightweighting
Reducing glass wall thickness by 10–15% cuts per-unit cost and shipping weight. The trade-off:
- Drop-test performance degrades proportionally
- Minimum wall thickness: 2.0mm for 30ml bottle (below this = high breakage rate)
- Savings: Approximately $0.01–0.03/unit for a 30ml bottle
Lightweighting makes sense for high-volume SKUs with controlled distribution. For premium products shipped individually to consumers, the breakage risk outweighs the savings.
9. Complementary Packaging: When Glass Isn’t the Only Option
While glass dominates serum and perfume packaging, some product categories call for alternatives. An acrylic cream jar manufacturer can provide wide-mouth jars with the visual clarity of glass but at lower weight and breakage risk — acrylic jars work well for creams, masks, and balms where UV protection is less critical. For brands mixing glass bottles with plastic jars or tubes, sourcing from a supplier that carries both categories simplifies quality control and consolidates freight.
10. Frequently Asked Questions
Q: What is the minimum order quantity for custom glass bottles?
Stock molds with standard color: 5,000–10,000 pieces. Custom mold (new shape): 30,000–50,000 to amortize tooling cost. For smaller runs, use stock bottles with custom decoration (screen printing, labeling) instead.
Q: How long does glass bottle production take?
Stock mold, standard color: 25–35 days. Custom color: 30–40 days. Custom mold: 45–60 days including mold fabrication. Add 15–35 days sea freight depending on destination port.
Q: Can I get free glass bottle samples?
Most suppliers provide 2–5 free samples of stock specifications. Custom samples (new mold or custom color) typically cost $50–300, usually credited against your production order.
Q: What documentation should I receive with my glass bottle order?
Minimum: Certificate of Compliance (CoC), dimensional inspection report, drop-test report. For regulated markets: USP <660> glass type test report, heavy metal release test (EU 10/2011 for Europe).
Q: Is amber glass necessary for essential oils?
For essential oils with <6 month shelf life or dark storage, clear glass plus opaque secondary packaging works. For premium positioning or >12 month shelf life, amber or violet glass is the safer call. Cost premium is only 5–10%.
Q: Where to buy wholesale glass bottles for cosmetic use?
Work directly with a glass bottle manufacturer in China (Xuzhou region for volume, Ningbo/Shaoxing for mid-tier) or through a packaging sourcing agent. Avoid generic B2B marketplaces for production orders — quality control is nearly impossible to enforce. Request samples, factory audit reports, and ISO certifications before committing.
11. Need Help Choosing the Right Glass Bottle?
Glass types, neck finishes, sizes, sourcing, QC. We’ve covered the specs. But your formulation, brand positioning, and target market determine the right combination.
Tell us three things and we’ll recommend the exact bottle specification:
- Your product type and estimated pH / essential oil concentration
- Your target retail price point and market (US, EU, both)
- Your first production order quantity
Request a Free Glass Bottle Consultation →
Our recommendation includes:
- Glass type and color recommendation
- Neck finish and closure matching
- Realistic MOQ and lead time for your order volume
- Estimated per-unit cost at your volume
- Supplier matching (based on your volume and quality requirements)
✅ ISO 9001 Certified ✅ USP <660> Glass Type Testing ✅ Drop-Test Report Provided ✅ 10+ Years Glass Manufacturing Experience
Procurement Manager’s Printable Checklist
Before placing your next glass bottle order, verify:
- [ ] Glass type specified (Type III standard; Type I for pH <3.5 or essential oil >10%)
- [ ] Glass color specified with UV transmission requirement (amber ≤15% for essential oils)
- [ ] Neck finish code specified (e.g., 18/400, 20/410 — not just “18mm” or “20mm”)
- [ ] Neck flatness tolerance specified (≤0.15mm deviation)
- [ ] Dropper bulb material specified (nitrile or TPE for essential oils — not natural rubber)
- [ ] Color masterbatch approved with ΔE tolerance in writing (≤2.0 standard; ≤1.0 premium)
- [ ] Drop-test method agreed (1.2m, 3 orientations, 0% breakage target)
- [ ] Thermal shock test specified if hot-fill is used (ΔT = 40°C)
- [ ] Polariscope stress test report requested for new molds
- [ ] Supplier provided: CoC, dimensional report, drop-test report
- [ ] AQL sampling plan agreed (recommend: AQL 2.5, Level II for cosmetic glass)
- [ ] Lead time buffer: +2 weeks for custom color, +3 weeks for new mold
- [ ] Sea freight transit time factored into launch timeline (15–35 days depending on destination)
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