IQC and Supplier-Quality Pages on Changzhou Manufacturer Websites: How Should They Be Accepted?

Direct answer: An incoming inspection (IQC) / supplier quality page cannot just say "100% inspection or AQL sampling; qualified material goes into stock." It should state which incoming materials are inspected, against which drawing/standard/purchase order, how a lot is defined, which sampling plan is used (AQL/inspection level/Ac-Re), which items and gauges are used, how a lot is accepted or rejected, how nonconforming material is segregated, returned, sorted, reworked or concession-accepted, how SCAR/8D is opened and closed, how supplier performance is scored, the conditions for skip-lot/reduced inspection, and how long records and retention samples are kept. Otherwise, when a customer asks "how do you control bought-out parts, who sets the AQL, can nonconforming material get mixed, what if the supplier does not correct it," the answer becomes an ad-hoc explanation.

This guide is for procurement, quality, process, production and website teams at manufacturers in Changzhou and nearby industrial areas. It explains how to build and accept an IQC/supplier quality page. Information is current to 2026-11-02. It is a review of public standards and project practice, not a quality audit, inspection decision or legal advice; the specific sampling plan, AQL, inspection items, disposition and retention period depend on customer requirements, the contract/quality agreement, product characteristics and company procedures.

How does the IQC page relate to supplier onboarding, AVL, quality agreement, COA and 8D pages?

The supplier onboarding/AVL page answers "how a supplier is admitted"; the contract/quality agreement page answers "quality responsibility, acceptance criteria and breach"; the COA/batch traceability page answers "how inspection reports and batches are traced"; the 8D page answers "how customer complaints are closed"; the IQC page answers "how incoming material is inspected, judged, dispositioned and improved at the supplier." Admission is "qualification"; IQC is "lot-by-lot gatekeeping"—neither replaces the other.

The common break is: a supplier joins the AVL and is immediately "exempt", with no incoming lot records; the AQL was agreed verbally by purchasing and is not updated when the drawing/standard changes; sampling covers only the easy items and skips key dimensions/material certificates; nonconforming and conforming material are stored together and sorted-out defects go back into stock; a SCAR is issued but nobody follows up and the same problem recurs; a customer audit asks for incoming records and they are recreated. A page that states basis, sampling, judgment, segregation, SCAR and performance gives procurement, quality and warehouse one rulebook.

This page map is editorial; control of external providers may follow GB/T 19001-2016, clause 8.4, and the customer requirements/quality agreement.

Which incoming materials does IQC inspect, and against what?

IQC typically covers raw materials, purchased parts, outsourced parts, packaging, consumables and customer-supplied material (which has its own receipt/inspection rules). The basis should at least include: purchase order/contract, drawing/specification (with revision), material/performance standards, supplier COA/material certificate, approved sample, packaging/labelling requirements and customer-specific requirements. Before inspection, confirm "what lot this is, which drawing revision, which supplier, which batch, how many, and whether the certificates are present"—otherwise the inspection cannot be traced.

Not every item is 100% inspected: key characteristics, regulatory/safety items, customer-designated items and mix-up-prone items need focus; appearance/packaging can be sampled; material composition/performance may rely on the supplier COA plus periodic verification/third-party reports. But "relying on COA" does not mean "not checking the COA": verify the report items, batch, standard, date, signature/stamp and, where needed, run verification. If the supplier changes material/process/origin, reassess; an old approval cannot be used forever.

This input list is editorial; specifics follow the purchase order, drawing/standard, quality agreement and customer requirements.

How should the sampling plan be set: AQL, inspection level, Ac/Re?

Lot sampling commonly uses GB/T 2828.1 (sampling procedures for inspection by attributes, indexed by AQL): define the lot size N, inspection level (general I/II/III or special S-1 to S-4), AQL and defect classification, then look up the sample-size code, sample size n, acceptance number Ac and rejection number Re. AQL is a sampling-plan parameter: when the quality level is at or better than AQL, the plan accepts most lots; it is not "the defect rate the supplier is allowed to ship", and it is not a reason for a supplier to ship defects deliberately. Inspection level, AQL and judgment rules belong in the contract/quality agreement/inspection specification, not in an inspector's ad-hoc decision.

Key/safety characteristics usually use a stricter plan (tightened, 100%, or the customer's zero-defect plan); appearance/minor characteristics may be relaxed, but key items must not be mixed into general sampling. Continuous lots may switch between normal/tightened/reduced per the standard; isolated/single lots should use an LQ plan or a customer-approved method, not the continuous-lot AQL table. Samples should be random and cover different packages/positions, not just the top layer.

Sampling methods are in GB/T 2828.1-2012; specific levels, AQL and judgment follow the contract/quality agreement/customer requirements, and this article does not reproduce the tables.

How should inspection items, gauges and environment be accepted?

Inspection items should cover the key characteristics in the drawing/standard/customer requirements: dimensions, appearance, function/performance, material/composition, packaging/identification, and where needed assembly trial-fit, salt spray/hardness/electrical performance. Each item needs a method, gauge/equipment, accuracy, environmental condition, sample and record. Gauges must be calibrated/verified and the measurement system fit for purpose (MSA where needed); one calliper cannot measure everything, and precision measurement cannot be done in an uncontrolled environment.

Appearance inspection needs boundaries: colour/gloss/scratch/burr/stain judged against a signed sample/limit sample/customer standard, not personal feeling; function/performance per the standard method and conditions, recording actual values rather than "OK". Inspectors need training/authorisation, and key roles need qualification; where the customer specifies a method/gauge, follow it. The page can say "inspection per drawing/standard/customer requirements, calibrated gauges, trained inspectors", but must not publish customer drawings or special-characteristic lists.

Inspection items and methods follow the drawing/standard/customer requirements; gauge calibration is covered on the measurement page, and this article does not replace a specific inspection specification.

Lot disposition: accept, reject, sort, rework, concession

Judge by the sampling plan: if the number of nonconforming samples is at or below Ac, accept; at or above Re, reject. A rejected lot must not go directly into stock; follow nonconforming control: return/replace, 100% sort, rework/repair, concession (with authorisation/customer approval), or scrap. Rework/repair must be re-inspected; a concession must state the deviation, quantity, period, responsibility and customer approval where applicable. A supplier must not "sort it and send it back" without our or third-party witness/records.

The easiest mix-up is "the lot failed but we use the good ones": sorted-out conforming parts must be re-identified/inspected/recorded, and the remaining nonconforming parts segregated/returned/scrapped—never put back into stock. Concession must not become routine; repeated concessions for the same supplier/problem mean the supplier's process is not controlled, requiring a SCAR/tightening/downgrade. The page can say "lot judgment, segregation, re-inspection after rework, concession approval", but not "everything can be concession-accepted/does not affect delivery".

Judgment and disposition follow the sampling plan, quality agreement and customer requirements; whether a concession needs customer approval depends on the contract.

How should nonconforming material be segregated, traced and notified?

Nonconforming incoming material must be identified immediately (red tag/nonconformance label), segregated in a designated area, and locked/frozen in the system to prevent misuse/mixing; record supplier, part number, batch, quantity, nonconformance, discovery date, inspector and disposition. Traceability must answer "which work orders/products/customers used this batch, and how much is in stock/in transit", with recall/customer notification where needed. Notify procurement/supplier in writing (SCAR/email) with evidence, requirement (return/sort/rework/8D) and deadline.

"Segregation" is not moving bad parts to a corner: use physical segregation/locks/access control, clear identification and no mixing with conforming material; freeze the ERP/WMS so material cannot be issued. When a supplier comes to sort/rework, define the area, supervise, log entry/exit, and re-inspect/identify the sorted conforming parts. The page can say "nonconforming segregation, batch traceability, written notification", but must not publish supplier names or specific defect data.

Nonconforming control is editorial; specific segregation, traceability and notification requirements follow the quality agreement, customer requirements and regulations.

How do SCAR/8D and supplier performance connect?

Incoming nonconformance/repeat problems should trigger a SCAR (supplier corrective action request) or 8D, requiring containment, root cause, corrective action, verification and prevention; we must review the report, verify effectiveness and close it—not "close on receipt". Performance should at least cover lot acceptance rate/incoming PPM, SCAR count/on-time response/closure effectiveness, repeat problems, delivery and cooperation; score/grade periodically and link to orders, tightening/reduction, downgrade/exit.

SCAR quality matters more than quantity: the root cause cannot be just "employee carelessness/strengthen training"; it needs evidence (5 Why/fishbone/data), and corrective action must change the process/document/training/poka-yoke; verification looks at subsequent lots. If a supplier repeatedly fails, escalate: tightened inspection, hold new orders, downgrade, second source, exit. The page can say "SCAR/8D, performance scoring and escalation", but must not publish supplier lists/scores/penalties.

SCAR/8D and performance methods are editorial; specific flow, deadlines and escalation follow the quality agreement and supplier management procedure.

How should skip-lot, reduced inspection and tightened inspection be described?

Skip-lot/reduced inspection/exemption are not granted because "the relationship is good" or "delivery is urgent": they need stable performance (e.g. consecutive conforming lots), an effective quality system/process control, written rules and approval, and they do not apply to key/safety characteristics or customer-designated full inspection. GB/T 2828.1 has normal/tightened/reduced switching rules; skip-lot may follow the qualification/score approach of GB/T 2828.3. Tightened inspection is used when quality deteriorates/consecutive rejections; reduced inspection for long-term stability; key items still use stricter plans.

Even an exemption must be traceable: exemption list, applicable part/supplier/period, periodic verification (first article/periodic inspection/COA review), and an exit mechanism on abnormality. If the contract requires 100% inspection/third-party inspection, "we exempt it" cannot override that. The page can say "stable suppliers may be exempt/skip-lot per procedure, key items excluded", but not "all incoming material exempt/always reduced".

Switching/skip-lot rules are in GB/T 2828.1-2012 and GB/T 2828.3; specific exemption/reduction conditions follow company procedure, contract and customer requirements.

How should records, retention samples and traceability be kept?

Each incoming lot should retain at least: delivery note/batch number, purchase order, drawing/standard revision, sampling plan (N/level/AQL/n/Ac/Re), inspection items/actual values, judgment, inspector/date, nonconformance disposition, SCAR, COA/material certificate and concession approval. Retention samples follow product/customer/regulatory requirements, identified by batch/date/period; the retention period follows the contract/customer/regulations (automotive/medical may be longer), and disposal at expiry follows procedure—do not discard at will.

Records must trace "supplier—batch—inspection—stock—work order—product—customer", and be tamper-resistant/readable whether electronic or paper; a customer audit should be able to retrieve them quickly, not recreate them. Customer names, drawings, special characteristics and supplier prices in records are confidential and must not be published; the page can say "records retained/traceable", but should not promise specific customer names or periods unless the contract states them.

Retention periods and sample requirements follow the contract, customer, regulations and company procedure; this article does not promise specific years.

What should the page say, and what must not be published?

A public page should include: IQC scope/incoming types, inspection basis, the principle for setting the sampling standard/level/AQL, inspection items/gauges/environment, lot judgment and disposition, nonconforming segregation/traceability/notification, SCAR/8D and performance, conditions for exemption/skip-lot/tightened/reduced inspection, records/retention samples, and a contact route. Do not publish: supplier names/prices/scores, customer drawings/special characteristics, specific defect rates/lot data, customer names, or open claims/disputes.

Wording must be precise: "sampling plans are set per contract/quality agreement/customer requirements; lots are inspected/judged; nonconforming material is segregated and supplier improvement is driven", not "100% inspection guarantees zero defects/AQL 0.65 guaranteed/all suppliers exempt". A customer audit cares whether the rule is written, executed and recorded, and whether exceptions are closed—not how polished the page is. Keep versions/dates when updating.

These red lines are editorial; whether customer/system requirements are met is determined by the customer audit and certification body, and this is not an audit conclusion.

Go-live acceptance checklist

Ten checks: incoming scope/basis, sampling plan, inspection items/gauges, lot judgment/disposition, nonconforming segregation/traceability, SCAR/performance, exemption/skip-lot, records/retention samples, public boundaries, and updates/evidence. Each needs an owner, evidence and review date. The pass condition is not "the page says IQC", but that a customer can see how lots are gated and exceptions closed, and the company can execute the same rules.

Before go-live, run one real incoming lot through: delivery note → drawing/standard → sampling plan → inspection → judgment → stock/segregation → SCAR → performance. Any step that fails is a gap in the page or the process.

This checklist is editorial; specific IQC requirements follow the contract/quality agreement, customer requirements and the company's inspection procedure.

Who should read this, who should not, and what decisions does it support?

It suits manufacturers in Changzhou and nearby areas with purchased/outsourced parts or raw materials, many suppliers, and customers who audit incoming control or the quality system—especially equipment, auto parts, electronics, metal processing, injection moulding and assembly; it also suits buyers/SQEs assessing a supplier's incoming control. It does not suit customer-supplied-material-only, no-purchasing businesses, or teams wanting one page to replace inspection specifications/quality agreements.

Read it if you are in procurement, quality, warehouse, process, production or a website vendor; you are building an IQC/supplier quality page, cleaning up sampling plans, handling incoming nonconformance/mix-ups, issuing SCARs, or running supplier performance; or you need to answer "how do you inspect, who sets AQL, what happens on nonconformance, what if the supplier does not correct it." Skip it if you sell "exemption/100% inspection" as an advantage, write "AQL 0.65" without a sampling basis, or want a template to replace inspection records. It supports self-review of scope, sampling, judgment, segregation, SCAR, performance, exemption/skip-lot and records.

This role split is editorial; specific duties follow the company's procurement, quality and warehouse procedures.

Lingyi Information is a website development and enterprise AI project provider, not a quality audit, inspection or certification body. This article is not a substitute for inspection specifications, quality agreements, customer audits or legal advice. Changzhou projects are delivered remotely or on site as confirmed per project; Lingyi is one candidate, does not claim a local office or team, and does not promise quality performance, audit outcomes or inquiries.

FAQ

Is "AQL sampling" enough on the website?

No. State how lots are defined, the inspection level, which defect classes the AQL applies to, sample size/Ac/Re, inspection items, judgment and disposition; AQL is a sampling-plan parameter, not a promise that defects are allowed. The customer also needs to know how nonconforming material is segregated and how SCARs are closed.

Does a lower AQL mean stricter inspection?

Generally yes: a lower AQL means the plan demands a better quality level; but inspection level, sample size and judgment rules also matter. Key/safety characteristics usually use a stricter plan (tightened/full/customer zero-defect), not a single AQL value. AQL should not be read as "the supplier may deliberately ship up to this defect rate".

What happens when incoming material fails?

Identify/segregate/freeze stock first, then choose return/replace, 100% sort, rework/repair (re-inspect), concession (authorised/customer-approved) or scrap; trace the batch to work orders/products, notify procurement/supplier in writing and issue a SCAR/8D. Sorted conforming parts must be re-inspected/identified and must not go back into stock unrecorded.

Can a supplier be exempt or on skip-lot?

Yes, but with stable performance, an effective quality system/process control, written rules and approval, plus periodic verification; key/safety characteristics and customer-designated full inspection are excluded. GB/T 2828.1 has normal/tightened/reduced switching rules, and skip-lot may follow GB/T 2828.3; exemption cannot be granted by relationship or delivery pressure.

What is the difference between IQC, IPQC and FQC?

IQC covers incoming/purchased/outsourced parts at receipt; IPQC covers in-process patrol/first-article/process control; FQC/OQC covers finished-product/shipment inspection. The objects and timing differ, and records/judgments must connect; IQC cannot replace supplier process control or finished-product release.

If the customer requires third-party inspection, is IQC still needed?

Yes. Third-party/customer inspection is additional verification; it does not transfer the supplier's/manufacturer's quality responsibility and cannot replace IQC lot records, segregation and SCAR. Findings should feed back into the IQC plan, supplier performance and corrective action, with tightening/suspension where needed.

One-sentence takeaway

A Changzhou manufacturer's IQC/supplier quality page should not be "100% inspection/AQL sampling". It should turn incoming scope and basis, sampling plan, inspection items and gauges, lot judgment and disposition, nonconforming segregation and traceability, SCAR/performance, exemption/skip-lot conditions and records into a verifiable checklist—so a customer can see how lots are gated and exceptions closed.

Method and limitations

This is a review of public standards and project practice, not an audit or legal opinion on any company's IQC, sampling decision, supplier audit or quality agreement. No undisclosed supplier lists, prices, customer drawings or defect data were used. Sampling, checklists, criteria and the acceptance checklist are editorial suggestions, not quality audit conclusions. Specific sampling plans, AQL, inspection items, judgment, retention periods and exemption conditions depend on the contract/quality agreement, customer requirements, standard version and company procedures.

Sources and scope

Information is current to 2026-11-02. The following are public official/standard pages; their scope, version and wording control.

1. GB/T 19001-2016, Quality management systems—Requirements, clause 8.4 (control of externally provided processes, products and services) and clause 8.6 (release of products and services): National Standards Full-Text Public System. System requirements for external-provider control, verification and release.
2. GB/T 2828.1-2012, Sampling procedures for inspection by attributes—Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection: National Standards Full-Text Public System. Lot size, inspection level, AQL, sample-size code, Ac/Re and normal/tightened/reduced switching rules; the full text is not provided due to copyright, and this article does not reproduce the tables.
3. Product Quality Law of the PRC (2018 amendment), Article 26: Hami Municipal People's Government (NPC text reprint). The producer is responsible for the quality of its products.