Treatment Pump: Precision Dispensing for Skincare & Serum
Treatment pumps deliver 0.08–0.30 ml per stroke — specifying output volume before sampling prevents the most common brand error: a 30 ml serum bottle that runs out in 4 weeks instead of 4 months.
Treatment pumps dispense 0.08–0.25 ml per stroke — a precision requirement that standard lotion pumps were never designed to meet. When a brand’s vitamin C serum retails at USD 120 for 30 ml, every extra 0.05 ml per stroke is margin erosion. This guide covers the technical and commercial decisions that determine whether your treatment pump delivers the right dose, protects formula integrity, and survives the 12-month stability test.
The treatment pump occupies a specific niche in the dispensing hierarchy: it sits between the high-output lotion pump (0.5–2.0 ml per stroke, designed for body applications) and the eyedropper (0.03–0.05 ml, designed for ultra-precise clinical dosing). The treatment pump’s 0.08–0.30 ml stroke range is calibrated for facial skincare serums, eye creams, face oils, and vitamin actives — categories where the formula is expensive, the consumer dose is small, and over-dispensing is the enemy of both efficacy and margin.
SUNSHINE (Ningbo Shaoshuai Plastic Industry Co., Ltd.) manufactures treatment pumps across 20/410, 24/410, and 28/410 neck sizes in PP construction, with Non-Spill certification and six surface finish options. Monthly production capacity: 300,000+ units across the treatment pump line. MOQ: 10,000 pcs on all standard SKUs, with 20-day lead time ex-works Ningbo.
What Is a Treatment Pump? How It Differs from a Lotion Pump
A treatment pump is a precision-output dispensing pump designed for skincare formulas where dose control is a product performance requirement — not just a packaging feature. The term “treatment” signals the application context: these pumps are used on products applied directly to the face in measured amounts, where the formula itself (an active serum, an eye contour treatment, a face oil) is expensive enough that over-dispensing damages consumer value perception.
| Feature | Treatment Pump | Lotion Pump | Why It Matters |
|---|---|---|---|
| Output per stroke | 0.08–0.30 ml | 0.50–2.00 ml | Serum at USD 120/30 ml = USD 4/ml; 0.12 ml vs 0.50 ml per dose = 4× cost difference per application |
| Dip tube length | Long, reaching bottle base (precision fit for tall slim 15–100 ml bottles) | Standard length (optimized for wide 200–500 ml bottles) | Short dip tube leaves 5–10 ml unusable in tall serum bottles; consumers perceive this as deceptive |
| Actuator nozzle | Narrow, angled downward (3–5 mm orifice) — prevents dripping | Wide, forward-facing (6–12 mm orifice) — high flow rate | Dripping from a lotion pump actuator on a serum contaminates the actuator and wastes formula |
| Spring | Stainless steel 304 or PP; short stroke (15–20 mm) | Stainless steel 304; longer stroke (25–35 mm) | Short actuator stroke gives consumer controlled, precise dispensing; longer stroke delivers too much at once |
| Sealing standard | Non-Spill: zero leakage inverted 60 min; formula-compatible gasket | Non-Spill standard | Face serums travel in luggage; Non-Spill is a hard requirement for DTC shipping compliance |
| Neck sizes | 20/410, 24/410, 28/410 (slim bottles) | 24/410, 28/410, 28/412 (standard bottles) | 20/410 is the smallest thread size usable with a pump; enables very slim 15–30 ml serum bottles |
| Bottle format | 15–100 ml; slim, tall glass or PET bottles | 100–500 ml; standard round PET/PP bottles | Serum is packaged for perceived luxury; slim bottle + precise pump = premium positioning |
The output volume difference is the most commercially significant distinction. SUNSHINE’s standard treatment pump delivers 0.20–0.25 ml per stroke (confirmed on the Matt White 24/410 SKU, WP-1337 equivalent). For a 30 ml serum bottle retailing at USD 80, a 0.25 ml dose means 120 applications — a full 4-month supply at once-daily use. If a lotion pump were used instead at 1.0 ml per stroke, the same bottle would deliver 30 applications — a 4-week supply, completely mismatched to the product’s premium positioning and expected shelf life.
Treatment Pump Types: Standard, Airless and Double-Wall
The treatment pump category covers three distinct dispensing technologies, each suited to different formula requirements and brand positioning. Choosing the wrong type results in formula degradation (for oxidation-sensitive actives), consumer experience failure (poor dosage control), or excessive packaging cost (airless on a water-based formula with no oxidation risk).
| Type | Mechanism | Formula Protection | Dose Accuracy | Formula Compatibility | SUNSHINE MOQ / Lead |
|---|---|---|---|---|---|
| Standard Treatment Pump | Spring-actuated piston; dip tube draws from bottle | Standard — some air contact via dip tube | ±5–10% per stroke (batch tolerance) | Water-based, oil-based, emulsion; viscosity 200–20,000 cPs | 10,000 pcs / 20 days |
| Airless Pump | Piston-in-cylinder; bottle bottom piston rises as formula dispenses; no air enters | Maximum — zero air contact; ideal for vitamin C, retinol, peptides | ±2–5% (tighter tolerance; no dip tube variation) | Water-based and oil-based only; no thick cream above 30,000 cPs | 10,000 pcs / 25–30 days |
| Double-Wall / Double-Layer | Decorative outer sleeve + functional inner cylinder with standard pump | Standard (inner wall is functional) | Same as standard | Same as standard treatment pump | 10,000 pcs / 25–30 days |
The airless pump is frequently over-specified. Brands hear “airless = better for actives” and apply it to formulas that don’t need oxidation protection — then discover the unit cost is 40–80% higher than a standard treatment pump for no functional benefit. The rule: specify airless only when your formula contains oxidation-sensitive actives (vitamin C in L-ascorbic acid form, retinol, certain peptides) at concentrations high enough that air contact during a 90-day shelf life creates visible degradation. A well-formulated vitamin C serum at 10% ascorbic acid in a dark glass bottle with a standard treatment pump and an adequate antioxidant buffer (tocopherol, ferulic acid) does not need an airless pump. Discuss with your formulator before specifying airless — and request oxidation stability test data comparing both configurations.
The double-wall pump (SUNSHINE WP-ID 61: “24/410 Double Layer Cream Pump”) serves a specific aesthetic purpose: it allows a metallic or frosted decorative outer sleeve on a functional PP inner component, achieving a visual premium that matches prestige skincare positioning without the cost of full metal construction. The inner mechanism is identical to a standard treatment pump; only the outer shell differs. For a detailed comparison of all three dispensing formats against droppers and other precision dispensers, see our guide to treatment pump vs lotion pump vs dropper.
Size Guide: 20/410, 24/410 and 28/410 for Skincare Bottles
Treatment pump neck sizes follow the same GPI thread notation as all dispensing closures. The difference from lotion and foam pumps is the bottle format: treatment pump bottles are typically slim, tall glass or PET containers (15–100 ml) designed to convey precision and luxury, not the wide-format utility bottles used for body care. Neck size selection must account for both thread compatibility and the visual proportion of the pump head relative to the bottle.
| Size | Neck OD | Bottle Format | Stroke Output | Best Application | SUNSHINE SKU |
|---|---|---|---|---|---|
| 20/410 | 20 mm | 15–30 ml ultra-slim glass or PET; eye serum vials | 0.08–0.12 ml | Eye cream, concentrated essence, high-potency serum | WP-1159 (20/410–24/410 colorful) |
| 24/410 | 24 mm | 30–80 ml slim glass or PET; most face serum format | 0.12–0.25 ml | Face serum, vitamin C, retinol, peptide treatment, face oil | WP-1305, WP-1329, WP-1337, WP-1339 |
| 28/410 | 28 mm | 50–100 ml standard or slightly wider bottles | 0.25–0.35 ml | Rich moisturizer-serum hybrid, face oil (larger format) | WP-1341, WP-1319 |
The 24/410 size is the industry standard for facial serum packaging, fitting the majority of 30–50 ml glass serum bottles used across prestige skincare. SUNSHINE’s 24/410 treatment pump range (WP-1305, WP-1337, WP-1339) covers this segment with both standard and crimp collar options. If your glass supplier specifies 24/415 (a common glass bottle finish), confirm the thread profile explicitly — 24/410 and 24/415 are not interchangeable even though the neck diameter is identical.
The 20/410 size enables ultra-slim packaging — the kind used for eye serums in 10–15 ml bottles where the pump diameter must be small enough to maintain elegant proportions. SUNSHINE’s 20/410 option (WP-1159) includes a colorful Aluminum collar option, which is particularly appropriate for prestige eye care positioning. Confirm with SUNSHINE whether the pump orifice delivers the target dose (0.08–0.10 ml) at your formula’s viscosity before approving samples.
Output Volume: Why 0.08 ml vs 0.25 ml Is a Business Decision, Not Just a Spec
The dose volume of a treatment pump is simultaneously a consumer experience parameter, a formula cost driver, and a product lifecycle decision. Getting it wrong produces either consumer dissatisfaction (too little formula per press — consumers perceive the product as skimpy) or margin erosion (too much formula per press — the bottle runs out 30% faster than the consumer expected).
| Output (ml/stroke) | Bottle Size | Applications at Once Daily | Duration | Typical Retail Position | Formula Category |
|---|---|---|---|---|---|
| 0.08–0.10 ml | 10–20 ml | 100–250 applications | 3–8 months | Ultra-luxury; concentration actives; eye serum | Eye serum, concentrated essence, high-potency retinol |
| 0.12–0.15 ml | 20–30 ml | 130–250 applications | 4–8 months | Premium; vitamin C, peptide, face oil, anti-aging serum | Vitamin C serum, retinol, peptide complex, niacinamide serum |
| 0.20–0.25 ml | 30–50 ml | 120–250 applications | 4–8 months | Mass-premium to prestige; face moisturizer serum hybrid | Hyaluronic acid serum, lightweight moisturizer, face oil |
| 0.30–0.35 ml | 50–100 ml | 143–333 applications | 5–11 months | Mass-premium; face cream, richer texture serum | Rich moisturizer, sleeping mask, face cream |
The calculation that every brand should complete before specifying output volume: (bottle size in ml) ÷ (target dose in ml) = number of applications. Compare that to the consumer’s expected use duration (typically 30–90 days for a daily skincare product). If the math doesn’t align, change the dose or the bottle size. A 30 ml vitamin C serum intended for 60-day daily use needs (30 ml ÷ 60 days) = 0.50 ml per day — if applied once daily with one pump, that means 0.50 ml/stroke. If two pumps per application is expected, the dose should be 0.25 ml/stroke. These are decisions for the product brief, not the packaging supplier — but they must be committed before sampling a treatment pump.
SUNSHINE’s standard treatment pump outputs 0.20–0.25 ml per stroke on the 24/410 range. Custom output (0.08–0.35 ml) is available by retooling the piston chamber — tooling fee USD 200–400, minimum 20,000 pcs, add 15 days to lead time.
Material and Formula Compatibility for Skincare Actives
Treatment pumps contact some of the most chemically aggressive skincare formulas — high-concentration vitamin C (L-ascorbic acid, pH 2.5–3.5), retinol in oil base, AHA/BHA exfoliants (pH 3.0–4.0), and alcohol-based toners. The pump’s internal materials must withstand these environments for 24 months of shelf life. The following matrix covers all high-risk formula categories.
| Formula Type | pH / Active Risk | PP Housing | Spring (SS304) | LDPE Gasket | Recommended Config |
|---|---|---|---|---|---|
| Water-based serum (HA, peptides, niacinamide) | pH 5.0–7.0; low chemical aggression | Safe — 24 months | Safe | Safe | Standard PP pump; SS spring; LDPE gasket — all SUNSHINE standard SKUs |
| Vitamin C serum (L-ascorbic acid) | pH 2.5–3.5; strong acid; oxidizing | Safe — PP acid-resistant | Risk: SS304 corrodes at pH <3 in high-humidity; rust staining in clear formula visible | Risk: LDPE swells in acidic + antioxidant preservative combinations | Specify all-PP (PP spring) + PTFE-coated gasket; or airless pump to eliminate air contact |
| Retinol / retinoid in oil base | pH N/A; oil-based; light-sensitive | Safe | Safe | Safe (oil-compatible) | Standard PP pump in opaque bottle; SS spring acceptable |
| AHA / BHA exfoliant (glycolic, salicylic) | pH 3.0–4.5; mild acid | Safe | Risk at pH <3.5 over 12+ months | Safe at <10% concentration | PP spring preferred for AHA products below pH 3.5; run ICH Q1A 12-month stability |
| Alcohol-based toner (>30% ethanol) | pH 4.0–6.0; high alcohol | Safe — PP alcohol-resistant | Safe | Risk: LDPE may swell >5% above 50% ethanol | Specify PP gasket or test LDPE at target alcohol %; run 90-day immersion test at 40°C |
| Face oil (vitamin C ester, rosehip, squalane) | No water; oil base only | Safe | Safe | Safe | Standard PP pump; confirm oil is not oxidized before sampling; use opaque bottle |
Surface Finish and OEM Customization Options
Treatment pump aesthetics are critical — this is a premium skincare category where the pump’s visual presence on the bottle shelf is part of the brand’s design language. SUNSHINE’s treatment pump range offers the full six-finish system used across disc caps, foam pumps, and mist sprayers, enabling coordinated multi-SKU packaging programs.
| Finish | Visual Effect | SKUs Available | MOQ | Lead Delta | Cost Premium |
|---|---|---|---|---|---|
| Smooth PP (white/black) | Clean, minimal; standard skincare aesthetic | WP-1305, WP-1337, WP-1339, WP-1341 (all) | 10,000 | None (20 days) | Base price |
| Ribbed PP | Textured grip; tactile premium | WP-1305, WP-1329, WP-1337, WP-1339, WP-1341 | 10,000 | None | Base price |
| Aluminum (anodized) | Metallic sheen; gold, silver, rose gold, black | WP-1305, WP-1329, WP-1337, WP-1339, WP-1341 | 10,000 | +3–5 days | +$0.06–0.12/unit |
| UV Coat (metallic lacquer) | Chrome, satin, matte metallic; no sleeve weight | WP-1305, WP-1329, WP-1337, WP-1339, WP-1341 | 10,000 | +5 days | +$0.05–0.10/unit |
| Water Transfer Printing | Marble, woodgrain, custom graphic on collar | WP-1305, WP-1329, WP-1337, WP-1339, WP-1341 | 10,000 | +7–10 days | +$0.08–0.15/unit |
| Bamboo | Natural material outer; eco/sustainable brand | WP-1305, WP-1329, WP-1337, WP-1339, WP-1341 | 20,000 | +10–15 days | +$0.15–0.30/unit |
The crimp treatment pump (WP-1329: “Custom Color 24/410 Treatment Lotion Pump Crimp Plastic”) is worth highlighting separately: it uses an aluminum crimped collar permanently fixed to a glass bottle neck, producing a tamper-evident, non-refillable closure that signals prestige and prevents consumer refilling (important for brands with trademark or formula protection concerns). The crimp configuration requires a crimper at your filling line; confirm filling line capability before ordering crimp-format samples.
Application Guide: Which Treatment Pump for Your Formula
| Skincare Category | Formula Viscosity | Dose Target | Neck Size | Spring | Collar Finish | SUNSHINE SKU |
|---|---|---|---|---|---|---|
| Vitamin C Serum pH 2.5–3.5; watery to light gel | 100–2,000 cPs | 0.12–0.20 ml | 24/410 | PP spring (mandatory) | UV coat, Aluminum (gold/silver) | WP-1337, WP-1339 |
| Retinol / Retinoid Oil-based; 0.025–1% retinol | 500–5,000 cPs | 0.10–0.20 ml | 24/410 | SS or PP spring | Smooth black, UV matte black | WP-1305, WP-1339 |
| Peptide / Niacinamide Serum Water-based; pH 5.0–7.0 | 200–3,000 cPs | 0.15–0.25 ml | 24/410 | SS spring (standard) | Smooth, Ribbed, Bamboo | WP-1305, WP-1337, WP-1341 |
| Hyaluronic Acid Serum Water-based; gel texture | 1,000–10,000 cPs | 0.20–0.30 ml | 24/410 or 28/410 | SS spring | Any finish | WP-1337, WP-1341 |
| Face Oil Oil base; rosehip, squalane, jojoba | 10–100 cPs | 3–5 drops (0.08–0.15 ml) | 20/410 or 24/410 | SS or PP spring | Aluminum, UV gold | WP-1159, WP-1305 |
| Eye Cream / Eye Serum Ultra-concentrated; small format | 500–8,000 cPs | 0.08–0.12 ml | 20/410 | PP spring preferred | Aluminum (silver/gold) | WP-1159 |
| AHA / BHA Exfoliant Glycolic, salicylic, lactic | 100–3,000 cPs | 0.15–0.25 ml | 24/410 | PP spring (if pH <3.5) | Smooth, Ribbed | WP-1337, WP-1339 |
Quality Testing: Dose Accuracy, Non-Spill and Stability for Premium Skincare
Treatment pumps for premium skincare face quality requirements more stringent than commodity dispensers, because formula cost per ml is high and consumer tolerance for variation is low. A 0.25 ml pump that delivers 0.35 ml on some strokes and 0.18 ml on others fails the product brief even if it passes a standard pump leak test.
| Test | Method | Protocol | Pass Threshold | Failure Addressed |
|---|---|---|---|---|
| Dose accuracy (gravimetric) | Gravimetric: weigh output of 50 consecutive strokes; calculate mean and CV% | Fill with water; 50 strokes at standard actuation rate; individual stroke weights | CV (coefficient of variation) <8%; no stroke >±15% from mean | Inconsistent dose = consumer complaint; over-dose = formula running out too fast |
| Non-Spill inverted | ASTM D3078 variant | Fill 80%; invert 60 min; weigh delta | <0.005 g loss per unit | DTC shipping; air travel; luggage transit |
| Full-drawdown test | Fill to 95% capacity; actuate until pump fails; measure residual | Count strokes to empty; weigh residual formula | Residual <3% of fill volume; <1 ml in 30 ml bottle | Dip tube too short → 3–5 ml unusable formula; consumer complaint about “half empty” bottle |
| Formula stability (filled) | ICH Q1A accelerated | Fill with customer formula; 40°C / 75% RH; 3 months; assess pump + formula | Dose CV <10% at end of test; no color change in formula; no gasket swell | Spring corrosion (vitamin C); gasket swelling (alcohol, AHA); orifice clog (viscous formula) |
| Actuation force (ergonomics) | Force gauge; 10 consecutive strokes; record peak force per stroke | Standard consumer press rate (1 stroke per 2 sec) | Peak force <10 N (consumer-comfortable); <8 N preferred for elderly/accessibility market | Stiff pump reduces consumer compliance; formula wasted when consumer “pumps hard” |
| Spray life cycle | Automated actuation rig; 1 stroke/sec | 10,000 actuations; assess orifice wear, seal condition, spring fatigue | Dose CV increase <10% at 10,000 strokes; no seal failure | Seal fatigue over product lifetime (typically 200–500 uses for a serum) |
Sourcing from SUNSHINE: MOQ, Lead Times and Sample Policy
| Order Type | MOQ | Lead Time | Deposit | Balance | Notes |
|---|---|---|---|---|---|
| Sample (standard SKU) | 50–100 pcs | 7–10 days | 100% upfront | — | Send formula for compatibility pre-check; specify target dose |
| Standard SKU, standard color + smooth/ribbed | 10,000 pcs | 20 days EXW | 30% T/T | 70% before shipment | WP-1305, WP-1337, WP-1339, WP-1341; 0.20–0.25 ml/stroke |
| Standard SKU, Aluminum/UV/WTP finish | 10,000 pcs | 25–28 days | 30% T/T | 70% before shipment | No tooling fee; finish surcharge applies |
| Standard SKU, Bamboo collar | 20,000 pcs | 30–40 days | 30% T/T | 70% before shipment | Natural material lead time sensitive to supply |
| Custom output dose | 20,000 pcs | 35–40 days | 30% T/T + tooling | 70% before shipment | Piston retool: $200–400; confirm target dose at sampling |
| PP spring upgrade (for vitamin C / AHA) | 10,000 pcs | +3–5 days | Standard | Standard | Specify “PP spring” at order; no tooling fee; small stock premium |
| Crimp collar format | 10,000 pcs | 25–30 days | 30% T/T | 70% before shipment | WP-1329; requires crimper at filling line; confirm before ordering |
SUNSHINE ships ex-works Ningbo. Lead time for the treatment pump line is 20 days for standard configurations — the same as the disc cap and foam pump lines, because all three use the same PP production platform. For orders above 100,000 units, advance booking of 6 weeks is required. Payment: 30% T/T on order confirmation; 70% before shipment. L/C at sight accepted above USD 50,000.
How to Evaluate a Treatment Pump Supplier: 6 Things to Check Before Ordering
The treatment pump category has a large number of suppliers offering similar-looking products at varying quality levels. The following checklist separates suppliers who understand precision skincare dispensing from those who have rebranded a standard lotion pump as “treatment” for the skincare market.
1. Can they provide dose accuracy data, not just dose claims? Ask for CV% (coefficient of variation) across 50 consecutive strokes from a filled production sample — not a claimed “0.25 ml per stroke” figure. A CV below 8% is acceptable; below 5% is good for premium skincare. If a supplier cannot provide this data, they have not measured it.
2. Do they offer PP spring as a standard option, not a custom exception? Any treatment pump supplier serving the skincare market should have all-PP internal construction as a standard catalogue option, not a special-order request. Vitamin C and AHA formulas require it; a supplier who treats it as unusual doesn’t understand the category they’re serving.
3. Can they confirm dip tube length tolerance against your specific bottle? The dip tube must reach within 3–5 mm of the bottle base. A supplier who provides a “standard length” without asking for your bottle dimensions will produce a pump that wastes 3–10% of your fill. Request dimensional drawings and specify the required dip tube insertion depth explicitly.
4. Is Non-Spill certification tested per production batch, or only on prototype samples? Many suppliers test Non-Spill on a pre-production prototype and then ship production units without re-testing. SUNSHINE tests Non-Spill on every production batch and includes the test certificate with each shipment. Confirm this in writing on the purchase order.
5. Can they provide material compatibility documentation for your specific formula pH? For any formula below pH 4.0, a credible supplier should be able to confirm spring material (SS304 vs PP) suitability and offer immersion test data at your target pH. “It should be fine” is not an acceptable answer for a premium skincare formula.
6. What is their full-drawdown residual on a 30 ml bottle? Ask for a full-drawdown test result: fill a 30 ml bottle, actuate until the pump fails, weigh residual formula. Acceptable: below 1 ml (3.3%). Common failure: 2–4 ml residual (7–13%) — a significant dose loss that consumers will notice when their serum runs out two weeks earlier than expected.
Common Mistakes When Specifying a Treatment Pump
1. Specifying neck size without specifying output volume
“24/410 treatment pump” is insufficient. The same 24/410 neck can hold a 0.08 ml pump (for concentrated eye serum) or a 0.30 ml pump (for a richer moisturizer). State the target dose in ml/stroke on every purchase order and sample request — not as a courtesy, as a technical requirement.
2. Using a stainless spring on a vitamin C formula below pH 3.5
The result is brown rust particles in a clear serum within 6–9 months of shelf life. This creates product recalls and brand damage. Specify PP spring on any formula below pH 4.0 as a standard precaution. The PP spring costs no more and adds no lead time.
3. Not testing dip tube length against the actual bottle
Treatment pump bottles are taller and slimmer than lotion pump bottles. A standard dip tube from a lotion pump fitted to a serum bottle will leave 2–4 ml of formula at the bottle bottom unreachable. Request a full-drawdown test (fill to 95%, actuate until empty, weigh residual) before approving the pump for production. Residual should be below 3% of fill volume — below 1 ml in a 30 ml bottle.
4. Ordering airless without a formula need
Airless pumps cost 40–80% more than standard treatment pumps. If your formula is stable in a standard pump with adequate antioxidant buffer (verified by 12-month ICH Q1A stability), the premium is wasted. Run stability testing with both configurations before committing to airless.
5. Approving crimp format before confirming filling line capability
Crimp closures require a specialized crimper at the filling line. If your filler doesn’t have one, you cannot use the crimp format regardless of what’s been ordered. Confirm filling line equipment before requesting crimp samples — this is not a packaging decision that can be reversed after tooling.
Frequently Asked Questions
What is the difference between a treatment pump and a serum pump?
They are the same device — “serum pump” is a market-facing description of the product’s intended use; “treatment pump” is the packaging industry’s functional category name. Both describe a precision-dose pump (0.08–0.35 ml/stroke) designed for high-value skincare formulas packaged in slim 15–100 ml bottles. At SUNSHINE, the treatment pump range (WP-1305 through WP-1341) covers all typical serum pump applications.
Can I use a treatment pump on a 100 ml bottle?
Yes, if the bottle’s neck size matches (24/410 or 28/410) and the dip tube is cut to the correct length (bottle depth minus 3–5 mm). The wider 28/410 treatment pump (WP-1341) is suited to 50–100 ml formats. At 0.25 ml/stroke, a 100 ml bottle delivers 400 applications — nearly 13 months of once-daily use, which is long for a single unit of a premium serum. Consider 30–50 ml with a 0.12–0.20 ml dose for better product lifecycle economics.
How do I know if I need an airless pump or a standard treatment pump?
Ask your formulator: does this formula contain L-ascorbic acid, retinol, or another oxidation-sensitive active at a concentration where air exposure during a 90-day shelf life causes visible degradation? If yes — and if the formula does not already contain an adequate antioxidant buffer system — consider airless. In all other cases, a standard treatment pump in a dark or opaque bottle with a well-formulated antioxidant system performs identically to airless at significantly lower cost.
What dose volume should I specify for a vitamin C serum in a 30 ml bottle?
For a 30 ml vitamin C serum intended for once-daily morning use over 90 days: (30 ml ÷ 90 days) = 0.33 ml per day. If one pump application covers the whole face, specify 0.30–0.35 ml/stroke. If two pumps per application, specify 0.15–0.18 ml/stroke. The second option (0.15 ml, two pumps) is more common in prestige positioning because it creates a ritualized “two-pump routine” that enhances consumer perception of product generosity while precisely controlling dose.
Can SUNSHINE match the pump finish to my bottle label color?
Yes for PP actuator color — PMS color matching at 10,000-piece MOQ, no tooling surcharge, +0 days lead time. For collar finishes (aluminum anodized, UV coat), color options are standardized (gold, silver, rose gold, black, chrome) — not custom-tinted. Water Transfer Printing allows full custom patterns on the collar surface at 10,000-piece MOQ with +7–10 days film setup.
About the Manufacturer
Treatment Pump Knowledge Hub
Explore the specialist guides in this series for deeper dives into each subtopic:
- Treatment Pump vs Lotion Pump vs Dropper: Best Dispenser for Serums
- Airless Pump Guide: When Your Serum Needs Zero Air Contact(coming soon)
- Treatment Pump Dose Guide: How to Calculate the Right ml/stroke for Your Serum(coming soon)
SUNSHINE Product Range
The following SKUs are available factory-direct. Click any product to view full specifications and request samples on the product page.
About the Manufacturer: Ningbo Shaoshuai Plastic Industry Co., Ltd. (brand: SUNSHINE) is a professional cosmetic packaging manufacturer based in Ningbo, Zhejiang, China, specializing in treatment pumps, lotion pumps, foam pumps, disc top caps, fine mist sprayers, and trigger sprayers for B2B skincare and personal care brands. Treatment pump range: 20/410, 24/410, and 28/410 neck sizes; PP construction; standard SS spring and all-PP spring option; crimp and screw-on collar formats; 0.08–0.35 ml/stroke (custom dose available). Surface finishes: Smooth, Ribbed, Aluminum (anodized), UV coating, Water Transfer Printing, Bamboo — 6 options. Monthly capacity: 300,000+ units (treatment pump line). MOQ: 10,000 pcs (standard); 20,000 pcs (custom dose, logo, bamboo). Lead time: 20 days EXW Ningbo standard; 25–40 days for custom configurations. Payment: 30% T/T deposit; 70% before shipment; L/C at sight above USD 50,000. Sample policy: 50–100 pcs, no tooling charge, 7–10 days; formula compatibility pre-check included. Quality: ISO 9001:2015; Non-Spill per batch; dose accuracy CV% available per batch QC certificate. Export markets: EU (30%), Middle East (25%), North America (20%), SE Asia (15%). Website: sunshine-lotionpump.com.
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