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Author:Kangdi 30-10-2026
Pain Patch OEM Factory Visit 2026: A 21-Point Walkthrough Checklist for Buyers
Visiting a pain patch factory for the first time and not sure what to look at, in what order, or what would tell you to walk away? This page is a practical 21-point walkthrough checklist for a buyer standing on the factory floor: the route through the building, what to look for at each station, the three questions to ask at every stop, and the seven things that are genuinely disqualifying versus the twenty that are merely informative. It is built to be printed and carried, not read at a desk.
By the end of this page you will know the walk route and why the order matters, the 21 checkpoints and what each one tells you, the 3 questions to ask at every station, and the 7 disqualifying findings versus the 14 that are normal.
A factory visit is the single most informative three hours in the whole supplier relationship, and it is the one most buyers under-use. The typical buyer is shown a reception room, a showroom, one production line, and a conference table, and leaves with a positive impression that is mostly a response to hospitality. The reason is that the route is chosen by the host. The counter-move is to know the route you want to walk before you arrive, and to ask for it politely but explicitly: from goods-in to dispatch, in material flow order, with the quality lab and the record room in between.
Bottom line. The most valuable part of a factory visit is not what the factory shows you, it is what happens when you deviate from the script. Ask to see the goods-in quarantine area. Ask to see the deviation log for the last six months. Ask which batch ran yesterday and whether you can see its record. A factory that accommodates these requests in a relaxed way is a factory with a real system. A factory that redirects every one of them to the conference table is telling you something more useful than any brochure.
Table of Contents
- The walk route: why material flow order matters
- The 21 checkpoints, in walking order
- The 3 questions to ask at every station
- The 7 disqualifying findings, and the 14 that are normal
- What to look at in the quality laboratory specifically
- What to look at in the record room specifically
- The video visit alternative: what it can and cannot replace
- What to write up afterwards (the 1-page trip report)
- FAQ: factory visit questions buyers ask most
- About Kangdi Medical and visiting our facility
1. The Walk Route: Why Material Flow Order Matters
The route determines what you can observe, because a factory cannot easily fabricate the physical layout of a building under construction or in operation. Walking in material flow order — raw materials in, product out — lets you see whether the physical space supports the process, which is much harder to fake than a document.
| Zone | What it is | Why the order matters | Time |
|---|---|---|---|
| 1. Goods-in and quarantine | Where incoming raw materials are received, inspected, and held pending release | First in flow order. Reveals whether unapproved material can physically reach production, which is the most common real-world quality failure | 15-20 min |
| 2. Raw material store | Where released materials are stored before use | Reveals segregation between approved and rejected material, and whether temperature-sensitive actives are stored correctly | 15 min |
| 3. Dispensing and weighing | Where materials are measured for a batch | The single most common source of batch-to-batch variation. Look for a second-person check and a weighing record | 15 min |
| 4. Mixing and matrix preparation | Where the adhesive matrix is compounded | Reveals whether homogenisation and temperature are controlled, which determines whether the active is evenly distributed | 20 min |
| 5. Coating, drying, and laminating | Where the matrix is coated onto the backing and dried | The core technology. Reveals line condition, drying control, and whether the line is running or idle | 30 min |
| 6. Converting and die-cutting | Where the laminate is cut into patches and pouched | Reveals die condition, print registration, and whether the variable data (lot, expiry, UDI) is printed inline and verified | 25 min |
| 7. Quality laboratory | Where release testing happens | Reveals whether testing is in-house or outsourced, and whether the instruments are calibrated | 25 min |
| 8. Packaging and finishing | Where cartons and shippers are assembled | Reveals whether count verification is automated and whether artwork version control exists on the line | 15 min |
| 9. Finished goods and dispatch | Where released product waits for shipment | Reveals whether released and quarantined stock are segregated, and whether the warehouse is temperature-controlled | 15 min |
| 10. Record room (or record system) | Where batch records and quality documents are kept | Last, because you now know what to ask for. This is where the visit is won or lost | 30 min |
Total walking time is roughly 3.5 hours including the record review, which is a full morning or afternoon. A visit compressed into 90 minutes is a visit that skipped either the record room or the goods-in area, and those are the two stations that produce the most information.
One practical note on the route: ask for it before you arrive, in writing, with the words "from goods-in to dispatch, in material flow order, including the quality lab and the record room". A factory that agrees without hesitation has a route it is comfortable with. A factory that proposes a different route is not necessarily hiding something — but the reason it gives for the alternative is itself informative.
2. The 21 Checkpoints, in Walking Order
The table below is the checklist itself. Each checkpoint has a specific thing to look at, and a specific thing that constitutes a finding.
| # | Checkpoint | Where | What to look at | A finding looks like |
|---|---|---|---|---|
| 1 | Quarantine segregation | Goods-in | Whether unreleased material is physically separated, labelled, and locked or gated | Unreleased material in open shelving next to released material, with no label distinction |
| 2 | Incoming inspection record | Goods-in | The actual record for the most recent delivery, with the test results and the release signature | No record for today's delivery, or a record with no test result and only a signature |
| 3 | Supplier qualification list | Goods-in | The approved supplier list, and whether the material in front of you came from an approved source | The active supplier is not on the list, or the list has no dates and no approval signatures |
| 4 | Cold or controlled storage | Raw material store | Whether temperature-sensitive materials are in a controlled unit, with a temperature log | A temperature logger present but the log has gaps, or the log is filled in retrospectively in one hand |
| 5 | Material labelling | Raw material store | Whether every container has a status label (released / quarantine / rejected) with a date and an expiry | Containers with only a product name and no status label |
| 6 | Weighing accuracy | Dispensing | The calibration sticker on the balance, with a date in the last 12 months | No calibration sticker, or a date more than 12 months old |
| 7 | Second-person verification | Dispensing | Whether a second person signs the weighing record, and whether that person is actually present | A single signature, or a second signature that appears to be in the same handwriting |
| 8 | Dispensing record completeness | Dispensing | Whether the record captures the material lot, the quantity, the balance ID, and the operator | A record with quantities but no lot numbers, which breaks traceability at the first step |
| 9 | Mixer condition | Mixing | The interior surface of the mixer, the blade condition, and whether there is a cleaning record on the machine | Visible residue from a previous batch, or a cleaning record with no date |
| 10 | Temperature and time control | Mixing | Whether the mixing temperature and time are recorded per batch, and whether the equipment has a chart or a log | A process that is "done by experience" with no recorded parameters |
| 11 | Homogenisation evidence | Mixing | Whether there is an in-process check for matrix uniformity, and what it consists of | No in-process check at all, with uniformity asserted from the finished product only |
| 12 | Coating line condition | Coating | The coating head, the web path, and whether the line is clean and maintained | A line that has clearly not run recently but is presented as the line for your product |
| 13 | Drying control | Coating | Whether the drying temperature is set, recorded, and alarmed | A temperature setting with no record and no alarm |
| 14 | In-process thickness check | Coating | Whether the coat weight or thickness is measured during the run, and how often | Thickness checked only on the finished patch, which means a drift is caught after the whole roll is coated |
| 15 | Die condition | Converting | The die edge and the cut quality on a sample from the line | Ragged edges, or a die that is visibly worn and in use |
| 16 | Variable data verification | Converting | Whether the lot, expiry, and UDI are printed inline and verified by a scanner rather than by eye | Inline printing with a visual check only, and no scanner verification |
| 17 | Release testing capability | Quality lab | Whether the assay is run in-house or outsourced, and what instrument is used | An HPLC present but not in use, with all testing outsourced and no in-house data on file |
| 18 | Calibration and reference standards | Quality lab | Calibration certificates for the instruments, and the reference standard storage conditions | Reference standards stored at room temperature in an unmarked vial |
| 19 | Retained samples | Quality lab | Whether a retained sample exists for each batch, stored under label conditions, for the shelf life | No retained samples, or retained samples stored in a drawer outside any controlled condition |
| 20 | Batch record completeness | Record room | Ask for the record of the batch that ran yesterday, and read it end to end | A record with gaps, retrospective entries, or a release signature dated before the test result |
| 21 | Deviation and CAPA log | Record room | The deviation log for the last six months, with the closure status of each entry | An empty log, which is not evidence of quality but evidence of no system. A factory with zero deviations in six months is not measuring |
Checkpoint 21 deserves a specific note because it inverts the usual intuition. A factory that proudly shows you a deviation log with zero entries is either very good or not looking, and in our experience across dozens of facilities it is almost always the second. A real manufacturing operation has deviations: a batch that ran slightly long, a temperature that drifted, a material that arrived with an out-of-spec certificate. A log with 8-15 entries over six months, each with a root cause and a closure, is a sign of a functioning quality system. A log with zero entries is a sign that nobody is writing it down.
3. The 3 Questions to Ask at Every Station
Three questions, asked at every one of the ten stations, produce more information than any checklist. The value is in the repetition: by the fifth station, you can tell whether the answers are consistent.
| Question | What it reveals | What a good answer sounds like | What a bad answer sounds like |
|---|---|---|---|
| "What is the most common problem at this station?" | Whether the operator knows the process well enough to have a view on its failure modes | A specific, technical answer: "the web tension drifts on humid days and we re-set it every two hours" | A generic answer: "no problems here", or an answer that describes a different station |
| "What do you do when it goes wrong?" | Whether there is an escalation path and a documented response, or whether it depends on who is on shift | A named procedure, a named person, and a described action | "We tell the supervisor", with no further detail, or a shrug |
| "Can I see the record for the last batch you ran here?" | Whether the record exists, is current, and is retrievable without preparation | The record appears within five minutes, complete, with today's or yesterday's date | The record "is with the QA manager who is out", or a record that appears twenty minutes later with fresh ink |
The third question is the most useful one and the most revealing. A factory with a real document system can produce yesterday's batch record from the relevant station in minutes, because the record travels with the batch. A factory with a document system that exists only for audits will need to go to the record room, find a folder, and in some cases produce a record that looks as though it was completed recently. The time it takes, and where the record comes from, are both data.
4. The 7 Disqualifying Findings, and the 14 That Are Normal
The most common mistake a first-time visitor makes is to treat every imperfection as disqualifying. A working factory has worn equipment, some clutter, and a floor that is not spotless. The table below separates the seven findings that should end the conversation from the fourteen that are normal in a functioning operation.
| Disqualifying (7) | Normal and not a reason to walk away (14) |
|---|---|
| Unreleased material physically accessible to production | Worn equipment that is maintained and calibrated |
| No batch record for the batch that ran yesterday | A deviation log with 8-15 entries, each closed |
| A release signature dated before the test result | Some clutter in the raw material store, with correct labelling |
| Material from a supplier not on the approved list, in use | A floor that is clean but not polished |
| No retained samples, or samples stored outside label conditions | Operators who need to check a document for an answer |
| Zero deviations in the log for six months or more | A single line, with the second line idle but maintained |
| The line presented as "your line" that has clearly not run in months | Older instrumentation that is calibrated and in use |
The right-hand column continues to 14 in practice: a modest office, a factory that is busy rather than impressive, a manager who answers a technical question with "I need to check", a visitor process that involves a hairnet and a shoe cover, a production floor with noise and smell, a warehouse that is full because the factory is working, and a team that is slightly nervous about the visit. None of these is a finding. A factory that is immaculate, silent, and empty is more concerning than one that is busy and slightly untidy, because a pain patch factory with no orders running is not a factory you want to depend on.
5. What to Look at in the Quality Laboratory Specifically
The quality lab is where a factory's claims about its own testing are either confirmed or contradicted. The table below sets out the five things to check.
| # | What to check | Why it matters | What a good state looks like |
|---|---|---|---|
| 1 | Whether the assay is run in-house | A factory that outsources all testing has no day-to-day visibility of its own product, and its release decisions lag the batch by days or weeks | An HPLC or GC in use, with recent chromatograms on the bench |
| 2 | Instrument calibration status | An uncalibrated instrument produces numbers that cannot be defended | A calibration sticker with a date inside 12 months, and a certificate on file |
| 3 | Reference standard storage | Degraded reference standards produce systematically wrong results that look plausible | Standards in a labelled vial, stored per the certificate, with a receipt date |
| 4 | Retained samples | The retained sample is the only physical evidence of what a batch actually was, and it is what a recall investigation depends on | A dedicated retained-sample cabinet, organised by batch, holding samples for the full shelf life |
| 5 | Recent test data on the bench | Whether the lab is actually working today, or is a room kept for visitors | Bench sheets with today's or yesterday's date, and a sample currently in preparation |
The fifth check is the fastest. A lab with bench sheets dated last week and a sample in preparation is a working lab. A lab with everything in a drawer and no sheet on the bench is a room. The difference takes ten seconds to observe and it is worth more than the certificate on the wall.
6. What to Look at in the Record Room Specifically
The record room is the last station and the one where the visit is decided. Four things to check, in order.
| # | What to ask for | What you are testing | What failure looks like |
|---|---|---|---|
| 1 | The batch record for the most recent batch produced on the line you saw | Whether records travel with the batch and are current | A record that cannot be located, or that arrives after a 20-minute search |
| 2 | The deviation log for the last six months, with closure status | Whether the factory measures its own deviations | An empty log, or a log where most entries are open with no closure date |
| 3 | The complaint log for the last 12 months, by product category | Whether complaints are tracked and analysed, which is the input to a PMS system | No complaint log, or a log that only records complaints formally received in writing |
| 4 | One stability report for a formulation similar to yours | Whether the stability programme exists and how the shelf life was justified | A report with only accelerated data and a 24-month conclusion |
Item 1 is the single highest-value five minutes of the entire visit. Read the record end to end: the material lots, the quantities, the in-process checks, the test results, the release signature. Look for the sequence: the release signature must come after the test result, and the test result must come after the batch. A release dated before the test is a finding regardless of how good the rest of the visit was, because it means the release decision was made on something other than the data.
7. The Video Visit Alternative: What It Can and Cannot Replace
A video walkthrough is a legitimate substitute for some of the visit and a poor substitute for the rest. The table below is honest about which is which.
| What a video visit can establish | What it cannot establish |
|---|---|
| Whether the production line for your SKU exists, and roughly its scale | Whether the record for yesterday's batch exists, because the video is recorded and edited |
| The general condition of the equipment and the layout | Whether unreleased material is physically accessible, because the camera frames what the host chooses |
| Whether the lab has the instruments it claims | Whether the lab is actually working today |
| Whether the factory is busy, if the video is live and unedited | Whether the deviation log is real, because the host can show any folder |
The practical rule is that a live, unedited video walkthrough with a specific request ("show me the goods-in area, then the dispensing bench, then the record for yesterday's batch") is worth roughly 60% of an in-person visit. A recorded and edited video is worth roughly 20%, and its main value is confirming that the building exists. If a physical visit is impossible for cost or visa reasons, insist on a live unedited call with a defined route, and treat the factory's willingness to do it as its own signal.
8. What to Write Up Afterwards (The 1-Page Trip Report)
The visit produces value only if it is written down the same day, because the detail fades within 48 hours. The 1-page report below is what we recommend, and it is short enough that it actually gets written.
| Section | Content | Length |
|---|---|---|
| Visit facts | Date, attendees, duration, route walked, whether the route was the one requested | 4 lines |
| Disqualifying findings | Any of the 7, stated plainly, with the station and what was seen | 0-7 lines |
| Notable observations | The 3-5 things that would change your decision either way, with the specific evidence | 5 lines |
| Questions unanswered | What you asked for and did not receive, and what the factory said about it | 2-5 lines |
| Documents requested | What you asked to be sent afterwards, with a date | 2-4 lines |
| Recommendation | Proceed / proceed with conditions / do not proceed, in one sentence with the reason | 1 line |
The "questions unanswered" section is the one most buyers skip and the one that matters most six months later. A factory that could not show you a deviation log during the visit and promised to send it afterwards, and did not send it, has told you something that will be relevant when the first quality issue arises. Writing it down converts a vague discomfort into a documented pattern.
9. FAQ: Factory Visit Questions Buyers Ask Most
9.1 How long should a factory visit take?
Three to four hours for the walk and the record review, plus a meal. A visit of 90 minutes or less has almost certainly skipped either the goods-in area or the record room. If the factory proposes a shorter visit, ask specifically whether the record room is included, and if it is not, ask for it to be added.
9.2 Should I hire a third-party auditor instead of going myself?
Both, if the order is above USD 50,000. A third-party audit (USD 1,000-1,500) produces a written report against a standard and is more rigorous on documentation. Your own visit produces the judgment that a report cannot convey: whether the team is honest, whether the answers are consistent, and whether you would want to work with them. The two are complementary, and a buyer who relies only on the audit misses the relationship signal.
9.3 What should I wear, and does it matter?
Closed shoes, no loose clothing, and expect to wear a hairnet, a lab coat, and shoe covers. It matters in one respect: a factory that does not require protective clothing for a visitor walking the production floor is a factory with a weak contamination-control culture, and that is a finding. If you are waved through without a hairnet, ask why.
9.4 Can I take photographs?
Ask first, and expect some restrictions. A factory that allows photographs of the production line and the lab, with a reasonable policy on customer-specific artwork, is a factory that is comfortable with what it is showing you. A blanket prohibition on all photography is not disqualifying, but it does mean you will rely on your notes for the trip report.
9.5 What if the factory will not let me see the record room?
That is a significant finding. A factory can legitimately restrict access to records containing other customers' information, and the reasonable response is to offer a redacted sample. A blanket refusal to show any record, including your own product's, means the records are not in a state that would survive your review, and you should treat it as one of the disqualifying findings.
9.6 Is an empty deviation log really disqualifying?
It is a strong signal rather than an absolute disqualifier, and it should trigger a specific follow-up question: "what would count as a deviation here, and can you walk me through one from last year?" A factory that can describe a real deviation and its resolution, even if it was not logged, is different from a factory that cannot describe one at all. The log with zero entries plus an inability to describe any deviation is the disqualifying combination.
9.7 How do I prepare for the visit?
Bring four things: the route you want to walk, the 21 checkpoints printed, the 3 questions per station, and a one-page summary of your own requirements (SKU, volume, market, regulatory pathway). The last one matters because it lets the factory's technical team answer specific questions rather than general ones, and specific answers are more informative than general ones.
9.8 Should I visit more than one factory?
Yes, if you are choosing a supplier rather than auditing a chosen one. Two visits on consecutive days, with the same checklist and the same questions, produce a comparison that is far more reliable than either visit alone. The second visit is where you notice what the first one did not show you.
9.9 What is the single most informative thing to look at?
The batch record for yesterday's batch, read end to end. It shows the material lots, the process parameters, the in-process checks, the test results, and the release decision, in the order they occurred. A complete record with the correct sequence is the strongest possible evidence that the factory runs a real system. Everything else on this page is a method for getting to that document with enough context to read it properly.
9.10 Can I visit Kangdi's facility?
Yes, and we encourage it. Our facility is in Zhoukou, Henan, about 1.5 hours by high-speed rail from Zhengzhou or about 2 hours from Guangzhou by air plus road. We will walk you from goods-in to dispatch in material flow order, including the lab and the record room, and we will show you the deviation log and a batch record for a comparable product without a pre-booking. Email us with "Factory Visit" and your proposed dates, and we will send a visit agenda, the travel logistics, and a document pack in advance so you arrive already knowing what you are looking at.
10. About Kangdi Medical and Visiting Our Facility
Henan Kangdi Medical Devices Co., Ltd has manufactured transdermal patches since 1989 from a GMP-certified facility in Zhoukou, Henan, China, and we ship to 200+ brand buyers and distributors across 40+ countries. We host buyer visits regularly and we walk the full route described in this guide, including the stations a buyer is usually not shown.
Three steps to arrange a visit. (1) Email us with "Factory Visit" as the subject line, including your proposed dates, the SKUs you are evaluating, and the markets you sell into. (2) We will send a visit agenda covering the 10 stations in material flow order, the travel logistics from Zhengzhou, Guangzhou, or Shanghai, and a document pack in advance. (3) On the day, bring the 21-point checklist and walk the route with our quality lead, who will show you the deviation log and a comparable batch record without prior preparation.
- Step 1: Email export@kangdimedical.com with "Factory Visit" as the subject line, including dates, SKUs, and markets.
- Step 2: Receive the visit agenda, travel logistics, and advance document pack within 3 business days.
- Step 3: Walk the full route with our quality lead, including goods-in, the lab, and the record room.
Tell us your dates, SKUs, and markets, and we will send the visit agenda and document pack within 3 business days.