FAQ
Frequently asked questions
Thirty answers to what brand owners ask before a first order. Each answer states the position first, then the conditions under which it holds. Last updated: 09 November 2026.
A · Formulation and compliance
Are your gels HEMA-free?
Yes — every current formula is HEMA-free, and TPO-free as well. SGS report GZCPCH26008387-01_EN, dated 08 Sep 2026, confirms both below detection on the formulas tested. If your file needs the report reissued under your brand name, we can arrange it; cost and timing depend on the lab.
Are they TPO-free?
Yes. TPO is absent from all current formulas, and the same SGS report covers it. The report tests HEMA, TPO and a list of specified organic compounds against the detection limit in force at the time of testing. Limits change, so ask us to re-test if your launch is more than twelve months out.
Which certificates do you hold?
ISO 22716 (CN26/00005010) and Cosmetics GMP (CN26/00005012), both issued by SGS and valid to 07 July 2029. The site is in Foshan, Guangdong: 3,500 m², 50 staff, four production lines. Certificates are issued to the legal entity, so check that the company name on the PDF matches the one on your purchase order.
Can you support CPNP registration?
Yes. We supply the CPNP-ready pack: formulation data, MSDS, input data for your safety report, test reports and label artwork. The notification is filed by your responsible person and paid by you, because the file must sit in the brand owner's name. We answer your assessor's technical queries directly, usually within one working day.
Do you provide an EU responsible person?
We can introduce an EU responsible person, with the cost borne by the brand. Most clients use their own RP or their importer's; we step in when a new brand has none. Tell us at quote stage, because the RP details must be on the label before artwork is approved.
What documents come with each shipment?
MSDS, TDS, a certificate of analysis for the batch, and the heavy metals, prohibited substances, microbiology and stability reports. Testing is by JST, Guangzhou. Everything is issued in English. If your broker needs a specific format, such as a signed declaration of conformity, ask before the order ships — reissuing after export takes days.
Is the testing third-party?
Yes. SGS issues the HEMA and TPO report and the GMP certificates; JST issues heavy metals, prohibited substances, microbiology and stability. We do not self-declare. One limit: a report covers the formulas and batches tested, so a changed formula needs its own report before you can rely on it.
B · Minimum order and price
What is your minimum order quantity?
200 pcs per shade, or 5 kg in bulk. That is a real economic batch, not a marketing number — a colour changeover takes about 10 minutes on our lines, so 200 pcs still runs at normal cost. Below that we can quote, but the unit price rises because setup is spread over fewer units.
Why 200 pcs per shade?
Because 200 pcs is where setup cost stops distorting the price. Four lines, a 10-minute changeover, and a 200-pcs run keeps the line in its normal rhythm. Under 200 pcs the fixed part of the run — cleaning, colour adjustment, first-article check — is spread over too few bottles, and the price stops being repeatable.
How much does a bottle cost?
Between USD 1.00 and 3.50 per bottle, depending on the product line and the shade. That range is not a quote: cat eye and builder sit at different points from a plain colour, and pigment cost varies by shade. Send your shade card and packaging format, and we reply with a line-by-line quote within two working days.
Do you charge extra for mixing shades?
No. Shades are priced individually, and mixing them in one order adds nothing. The only constraint is the 200 pcs per shade minimum, which applies per colour, not per order — one order can carry twenty shades as long as each clears 200 pcs. Packaging and labels are quoted separately.
Can I order in bulk instead of bottles?
Yes. Bulk starts at 5 kg per shade, and we fill bottles, jars or kg drums. If you fill in your own country, bulk is usually cheaper per unit, because you skip our filling and labelling. Tell us the container and closure you use, and we confirm compatibility with the gel before quoting.
C · Samples and shade matching
How long do samples take?
5 to 7 days from brief, then shipped for your approval. The clock starts when we have your shade references, packaging format and target market — not when you first email. Three rounds of formulation adjustment are included at this stage. Courier is at your cost.
Do you charge for samples?
We charge the cost price of the sample only; freight is yours. There is no sample fee on top, and no charge for the three adjustment rounds. If the sample converts to an order, ask for the sample cost to be credited against the first invoice, and get that in writing at quote stage.
How many rounds of adjustment are included?
Three. Each round is a reformulation against your written feedback, led by an engineer with fifteen years in UV gel. Describe what is wrong in physical terms — too thick, too yellow, shrinkage, adhesion failing after four days — because "not right" costs a round. A fourth round is possible but quoted.
Can you match a specific shade reference?
Yes, from Pantone, RAL, a physical sample or a photo. Physical samples give the closest match; photos are the weakest, because screen calibration and lighting shift colour. Send the reference plus the substrate you cure on, and we return a trial batch for side-by-side comparison before a production run.
D · Production and delivery
What is your production lead time?
15 to 20 days after sample approval, for orders within our normal batch size. That covers production only; transit is on top. If you have a fixed date — a trade show, a launch — give it to us with the order, and we confirm whether it is achievable instead of discovering it later.
What is your monthly capacity?
About 1,000,000 pcs per month across four lines, at 3,500 m² with 50 staff. A first order does not queue behind existing volume, because our lines are not running at capacity. Capacity is counted in units; if your order is in bulk kilograms, ask us to translate it into line hours.
Can you supply the packaging?
Yes. You can supply your own bottles, or we source them — we have regular suppliers for bottles, jars and boxes. Sourcing through us is usually faster for a first order, but it puts the spec under our control, so approve the spec sheet before we order. Custom moulds and shapes take longer.
Do you ship FOB or CIF?
Both. FOB Foshan or Shenzhen, or CIF to your port. We also work EXW if you have your own forwarder in Guangdong. Gel is not a flammable liquid, so it ships as general cargo — no UN number, no dangerous goods surcharge. Your broker confirms the HS code and duty rate.
How is the gel packed for export?
In your chosen bottle or jar, cartoned, then export-cartoned with the batch number on the outer label. Gel is not classed as dangerous goods, so it moves as general cargo; the MSDS still travels with the shipment because carriers and customs ask for it. If your market needs specific labelling — batch, PAO, RP address — send the requirements before production.
E · Payment and terms
What are your payment terms?
First order is 50/50 — 50% deposit, 50% before pickup. Repeat orders run 70/30. We accept T/T. If your finance team needs different terms, raise it at quote stage rather than after the proforma invoice, because terms are fixed on the PI and changing them means reissuing it.
What is the shelf life?
24 months from production, unopened, away from direct light. Once opened the clock changes: light exposure and contamination matter more than the printed date, so keep the bottle closed and out of sunlight. We print production date and batch number for your label; the PAO symbol is your call.
Can you do private label?
Yes — private label is the standard model, not an exception. Your brand on the bottle, your artwork, your shade names. We do not sell our own brand into your market, so there is no channel conflict. Artwork approval is your step; we check print files against our label dimensions before the run.
What if a batch does not match the approved sample?
Tell us within 14 days of arrival, with photos and the batch number. If the batch is off-spec against the approved sample, we remake it or credit it. If it is within normal colour tolerance but you want a tighter standard, that standard has to be written into the approved sample before production, not raised afterwards.
F · Factory and partnership
Where is your factory?
Foshan, Guangdong, about an hour from Guangzhou Baiyun airport. The plant opened in 2025 after the previous site was cleared for redevelopment; the parent company, Guangzhou Haixi Cosmetics, has been making nail products since 2014. Visitors are welcome — give us a week's notice so the line you want to see is running.
Can I audit the factory?
Yes, by video walkthrough or by sending a third-party auditor on site. Video is faster and free; a third-party audit costs you the auditor's fee and needs a date booked ahead. We hold ISO 22716 and Cosmetics GMP, so most auditors work from those certificates and check the line against them.
How long have you been making UV gel?
The parent company, Guangzhou Haixi Cosmetics, started in 2014; the Foshan plant is the 2025 move. That is twelve years in nail products, in a factory built for it rather than converted. Our formulation engineer has fifteen years in UV gel specifically, which is the part that matters for custom work.
Do you work with brands or distributors?
Brand owners directly — that is the work we are set up for: your shade card, your packaging, your label. We also supply distributors, but a distributor usually wants stock shades at volume, which is a different conversation from custom formulation. We do not sell our own brand into your market.
What is the adhesion grade?
4B by ASTM D3359 cross-hatch test, on natural nail and on tips. The scale runs 0B to 5B, so 4B means slight edge loss, not a failure. Adhesion depends on prep and base coat, so 4B holds only if your application steps match ours.
Still have a question?
Send it to DEE@SENYUANNAIL.COM or WhatsApp +86 133 9262 8678. We answer within one working day. For a quote, send shade count, packaging format, target market and first order quantity.