A nail polish bottle is glass with a PP screw cap carrying a cone seal and a nylon-bristle brush on a PP stem, because the solvent system (ethyl and butyl acetate) attacks PET, PS, AS, PMMA and standard gaskets. Common sizes are 5, 10 and 15 ml on stock (public-mould) glass, from about 500 pieces undecorated and ~2,000 printed; made-to-order glass in your own shape carries a 30,000+ piece floor and 30–60 days from mould approval.
Why the solvent decides the material
Nail polish and nail-polish remover sit in the same compatibility class as perfume: high-volatility solvent that permeates and swells many plastics and rubbers, evaporates through a poor seal, and lifts ordinary inks. The formula × packaging compatibility matrix gives the rule directly: glass bottle plus brush cap with a cone seal in the cap and solvent-resistant bristles; for acetone remover, glass with a purpose-made inner plug and cap liner. No stock plastic bottle is acceptable for either, regardless of supplier assurance. In practice that means:
- Bottle — soda-lime flint or high-flint glass, press- or blow-formed, thick base for stability.
- Cap — PP, which tolerates acetate solvents; ABS or plated outer shells are fitted over a PP inner cap so nothing plated touches the polish.
- Seal — a moulded cone or ring in the PP cap that seats on the glass neck bore; no elastomer liner unless it is a solvent-grade or PTFE-faced compound.
- Brush — nylon bristles set in a PP or metal ferrule on a PP stem; length set so the tips sit just above the base at full fill.
- Mixing ball — stainless steel, optional; specify count and diameter.
- Decoration — screen print with solvent-resistant ink, hot stamp, frosting or spray on the outside only; every decorated face is wiped with the polish and with alcohol before approval.
Specification: sizes, necks and parts
| Parameter | Published value | Note |
|---|---|---|
| Capacities | 5, 10, 15 ml stock; 20–30 ml for base/top coats (typical partner-factory range) | Brim-full capacity ±5% at 20°C water; fill line with headspace on the drawing |
| Glass grade | Flint (standard clear), high-flint (default), super-flint (near colourless); frosted is acid-etched high-flint | Sprayed colour goes on the outside only; the inside stays bare glass |
| Shapes | Square, round, tapered, faceted; thick base 3–4 mm on premium shapes | Avoid sharp internal corners — they concentrate stress |
| Neck | Narrow-neck screw finish specific to nail-polish tooling; bore (I dimension) sets the brush stem and cone seal | Glass neck tolerances are wider than injection-moulded ones — the cap factory needs the glass drawing |
| Cap | PP inner cap; optional ABS, aluminium or plated outer shell | Opening torque 0.2–0.7 N·m; reverse ≥2.5 N·m without slip; no thread strip |
| Brush | Nylon bristle, PP stem; flat, round or fan profile | Bristle length and tip flatness approved with the polish |
| Wall thickness | ≥2 mm at the base on standard glass; wall variation within 0.3 mm of spec | Every bottle annealed in a lehr — rushed annealing cracks weeks later |
| Weight | 2–3× the weight of an equivalent plastic bottle | Internal suspension packing; breakage allowance agreed up front |
The neck vocabulary — T, E, I, S, X dimensions — and why the closure factory needs the full drawing are on the neck finish and closure standards reference; glass grades and defect allowances are on glass bottle specifications.
MOQ, mould and lead time by route
Nail polish glass is one of the most heavily tooled public-mould categories in China, so a stock shape rarely needs a mould. The gate is the decoration minimum, then the made-to-order glass floor if you insist on your own shape. Figures below are indicative ranges via partner factories; the cross-category view is on the MOQ index 2026.
| Route | Indicative minimum | Tooling | Lead time, factory gate |
|---|---|---|---|
| Stock glass + stock PP cap and brush, undecorated | From about 500 pcs where a partner factory holds stock; low thousands if a run is needed | None | 7–10 days if in stock; 30–60 days if a glass run is required |
| Stock glass + screen print or hot stamp | About 2,000 pcs | Screen or foil plate — trivial; screen ≈ USD 0.014 per colour per bottle | Glass cycle + 5–7 days |
| Stock glass + frosting or sprayed colour | 2,000–5,000 pcs per shape | Colour-matching set-up per shape | 30–40 days (forming and decoration are usually two factories) |
| Stock cap + sprayed colour | 2,000–5,000 per cap shape | Colour matching | 30–40 days |
| Electroplated or metallised cap shell | Around 10,000 pcs | Racking only | 25–40 days including plating queue |
| Made-to-order glass, your own shape | 30,000 to 100,000–200,000 pcs | Hand mould ≈ RMB 2,500 ≈ USD 350 per set; automatic ≈ RMB 4,000 ≈ USD 555 per cavity; 4–8 cavity set RMB 16,000–32,000 ≈ USD 2,200–4,450 | 30–60 days from mould approval |
| Private cap or brush-stem mould | 3,000–10,000 pcs plus tooling | Injection tool RMB 25,000–70,000 ≈ USD 3,500–9,700; paid 30/40/30; brand-owned | Tool 45–60 days; programme 90–120 days |
| Buffer | — | — | Quoted cycle × 1.3; +15 days across Chinese New Year; sea 18–25 days to US West Coast, 30–35 to Northern Europe |
The glass mould itself is cheap — a few hundred to a few thousand dollars — so the mould fee is never the reason to avoid custom glass. The 30,000-piece furnace floor is. Detail on why that floor exists is in custom glass bottle mould cost and MOQ.
QC thresholds a nail polish bottle is signed against
The glass battery below is the same one used for serum and toner glass; the solvent rows are what make a nail polish order different. All of it sits under the four gates and golden-sample rule on our QC standards page.
| Test | Method | Pass threshold |
|---|---|---|
| Solvent compatibility | Cap, cone seal, brush and stem in the actual polish at 48°C for 30 days plus ambient and cold controls | No swelling, softening, bristle loss, colour bleed, odour change or gumming at the neck |
| Evaporation / seal | Filled and capped at 0.6–1.2 N·m, weighed, inverted 24 h and held at 45°C | No seepage; weight loss within the agreed limit for a volatile bulk |
| Vacuum leak | Filled, lying and inverted in a vacuum chamber | −0.08 MPa for 15 min, loss ≤0.5% (volatile bulks) |
| Decoration solvent resistance | Polish wiped over the printed face; 75% alcohol cloth, one pass | No ink lift, no coating loss |
| Decoration adhesion | 3M 600 over print and hot stamp, 10 passes, pulled at 45°; 3M 810 over cross-hatched spray | No lift; hot-stamp loss ≤0.5 mm²; sprayed pencil hardness ≥2H |
| Thermal shock | GB/T 4547: 55°C water bath 15 min → 20°C water 20 min | No cracking |
| Internal stress | GB 4545, polariscope | Within grade; no residual stress bands |
| Thermal cycling, filled | 48 ± 2°C 48 h; −5 to −15°C 48 h | No cracking, leakage or decoration change after recovery |
| Drop, capped and filled | 1.5 m at 45° onto concrete | No functional damage; transit breakage allowance agreed |
| Torque | Torque meter | Opening 0.2–0.7 N·m; reverse ≥2.5 N·m; no thread strip |
| Glass defects | A face vs other faces | 1–2 specks of Ø ≤0.5 mm on the A face, none on artwork; no stones over 1 mm; none on sealing land or thread |
| Acceptance sampling | ISO 2859-1 general level II | AQL 0 critical, 1.0–1.5 major, 2.5–4.0 minor |
| Heavy metals | Third-party laboratory | Pb+Cd+Hg+Cr(VI) ≤100 ppm (EU 94/62/EC) |
Vella is a Guangzhou-based beauty packaging solutions provider — a sourcing partner, not a factory — that specifies, sources, samples, quality-controls and ships nail polish glass, caps and brushes from vetted partner factories operating to ISO 22716 / GMP, against the thresholds above and a signed golden sample. The method is on how we work; the questions to ask any supplier are in how to evaluate a China packaging supplier.
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Launching a nail range?
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