Lotion pumps come in output steps of 0.5/0.7, 1.0/2.0, 3.5 and 5.0 cc per stroke; a “2 ml” brief lands on the 1.0/2.0 cc step and a “4 ml” brief on the 3.5 cc step (or 5.0 cc on a 1,000 ml pack). 2.0 cc suits 200–400 ml body lotion and conditioner; 3.5 cc suits 500 ml+ shampoo and body wash. Whatever the dose, the pump must survive ≥1,500 continuous actuations, prime in ≤5 strokes on an aqueous bulk (≤10 non-aqueous), return in ≤3 s, recover ≥95% of the fill, and hold a 50-stroke average within 5–10% of the specified dose with single strokes at ±15% — measured with your actual formula, not water.
How a lotion pump is sized
A lotion pump has around eleven parts — actuator, upper stem, lock collar, gasket, closure, pump seal, lower stem, spring, housing, glass or steel ball and dip tube. Dose is fixed by pump diameter, stroke length and spring force. Because new tooling for eleven parts is expensive, stock (common-mould) pumps are the default unless a brand is committed to a proprietary shape, and stock pumps come in fixed output steps rather than any dose you name.
| Parameter | Standard options |
|---|---|
| Neck sizes | Φ18, Φ20, Φ22, Φ24, Φ28, Φ33, Φ38 mm — matched to the bottle T dimension (24/410, 28/410 on haircare) |
| Output per stroke | 0.15/0.2 cc · 0.5/0.7 cc · 1.0/2.0 cc · 3.5 cc · 5.0 cc · 10 cc and above |
| Lock head | Guide-block lock · screw lock · clip lock · no lock |
| Structure | External-spring · plastic-spring · leak-resistant · high-viscosity pump |
| Feed | Dip tube (standard lotion bottle) or airless piston |
| Spring position | External spring never touches the formula; internal-spring pumps are cheaper but need a compatible spring alloy |
Two consequences for the brief. First, ask for the step, not a round number: “1.0/2.0 cc” or “3.5 cc”, not “about 2 ml”. Second, the spring matters as much as the dose — an external-spring pump keeps a corroding spring out of a natural or acidic formula. Full pump data are on airless, pump and sprayer specifications.
2 ml or 4 ml: choosing the dose
The right dose is the amount a customer uses in one application, delivered in one or two strokes. Too small and the pump feels mean and gets pumped five times; too large and the product is wasted and the bottle empties early. Partner-factory practice on 200–1,000 ml haircare and bodycare packs:
| Product and pack size | Typical dose step | Why |
|---|---|---|
| Body lotion, leave-in, 200–400 ml on 24/410 or 28/410 | 1.0/2.0 cc (a “2 ml” pump) | One application of lotion for arms or legs is two strokes; standard pumps average ≥3 g per stroke on aqueous bulk, so 2.0 cc keeps waste down |
| Conditioner or hair mask, 250–400 ml | 2.0 cc; disc-top or flip-top for the thickest masks | Viscosity 2,000–50,000 mPa·s — a standard 0.5 ml pump will not prime; test the orifice with the actual bulk |
| Shampoo, body wash, 500 ml on 28/410 | 3.5 cc (what a “4 ml” brief lands on) | One stroke per wash; wash-off products are dosed larger than leave-on |
| Family / salon body wash, 750–1,000 ml | 3.5 or 5.0 cc large pump | Dry-pump strokes allowed rise from <8 to <10 above 1,000 ml |
| Styling gel, 250 ml | 1–2 ml wide-bore pump | Gels string and cling; wide bore prevents suck-back |
| Hand soap / hand cream, 200–300 ml | 0.5/0.7 or 1.0 cc | Smaller application; 0.7 cc is the common hand-wash step |
If the same pump must serve shampoo and conditioner in a matching set, size it for the thicker bulk and accept a slightly generous shampoo dose. If you are undecided between 2.0 and 3.5 cc, sample both — a pump is priced in the same order of magnitude at either step, and the choice changes how many bottles a customer buys in a year.
The 1,500-cycle test and the rest of the sheet
These are the numbers a partner factory signs against for a lotion pump. They are run on samples filled with your actual bulk, because a cream that primes in 5 strokes with water can need 15 with oil.
| Test | Pass threshold |
|---|---|
| Service life | ≥1,500 continuous actuations; no loss of dose, no sticking, no dead travel |
| Dry-pump (air) strokes | <8 strokes for bottles ≤1,000 ml; <10 above 1,000 ml |
| Priming with product | ≤5 strokes aqueous; ≤10 strokes non-aqueous |
| Output per stroke | Single stroke ±15%; 50-stroke run average within 5–10% of the specified dose |
| Dose stability | Even and stable; standard pumps average ≥3 g (ml) per stroke; 1–2 ml on 250 ml styling-gel pumps |
| Dispensing efficiency | ≥95% of an aqueous fill recovered; ≥90% non-aqueous |
| Return time | Actuator returns in ≤3 s |
| Dip tube | Length measured to 0.02 mm; tolerance +2/−1 mm; 5 mm clearance from the base on a 250 ml bottle |
| Thread / fit | Clearance 0.1–0.8 mm; no thread strip at rated torque; fit-critical dimensions ≤0.5 mm |
| Thermal | Closures −24°C / +50°C; filled pack 48°C and −15°C, 24–48 h each; the rubber seal hardens below 0°C, so the elastomer is specified against formula and route |
How output is measured
Fill to nominal volume, prime with 15 strokes, weigh. Press 50 continuous strokes, weigh again. (Weight before − weight after) ÷ 50 = single-stroke dose. Repeat three times and average. The result is what the specification is signed against, and it is the number that should appear on the incoming-inspection report at the filler.
What fails in the field
The seal at the glass or steel ball under the spring is critical: if it leaks, product flows back into the bottle on each stroke, suction drops, and the pump starts “losing” doses after a month. A loose actuator-to-valve fit causes back-flow and resistance at the nozzle. Both are visible at IQC sampling — which is why the pump is sampled and weighed before it goes near a filling line, not after the first complaint.
MOQ and lead time for the pump itself
A stock 24/410 or 28/410 pump in black or white sits in the low thousands, matched to the bottle quantity, and runs 20–30 days from separate sub-assembly lines — in parallel with the bottle, so it rarely sets the date. A custom-colour actuator follows the spray minimum of 2,000–5,000 per set-up; a metallised or plated actuator moves to about 10,000 pieces and joins a plating queue. A proprietary pump is eleven tools and is only worth it once the line is proven. The per-component logic across formats is on the MOQ index 2026; the format on HDPE shampoo bottles and the range on haircare and bodycare packaging.
The pump line in your specification
One line, seven fields: “28/410 lotion pump, 3.5 cc, guide-block lock, external spring, dip tube cut to bottle (+2/−1 mm, 5 mm off base), black PP actuator; tested on actual bulk to ≥1,500 actuations, ≤5 priming strokes, ≥95% output, 50-stroke average within 5–10% of 3.5 cc.” Add the vacuum leak test (−0.06 MPa; −0.08 MPa 15 min ≤0.5% for volatile bulks) and 24 h inversion on the filled pack, per cosmetic packaging quality standards, and the neck drawing per neck finish and closure standards.
Vella is a Guangzhou-based beauty packaging solutions provider — a sourcing partner, not a factory — that routes briefs like this one to vetted partner factories operating to ISO 22716 / GMP, matches the components as one set, and runs the tests above on filled samples before any production run. If a supplier cannot tell you the output step and the priming stroke count on your bulk, use the checklist in how to evaluate a China packaging supplier before committing — or send the brief through the contact page.
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