PPGI Coil Receiving Inspection and Claim Documentation

When a PPGI coil arrives, check four things before the coil leaves the receiving area: the documents against the purchase order and contract, the coil and packaging for transport damage, the dimensions and coil condition, and a documented sample for coating tests. Record every finding with time-stamped photos and a signed inspection report. A claim succeeds or fails on whether you can show, with evidence, that the defect existed at the point of delivery and falls within the agreed specification. This guide sets out a practical receiving protocol and a claim file structure. It separates general industry practice, which you can apply broadly, from contract-specific requirements, which override general practice and should be confirmed in writing with your supplier.

Why Receiving Inspection Is a Legal and Commercial Step

Receiving inspection is not only a quality activity. It is the point at which risk and evidence meet. Many contracts and transport conventions set short notification windows for visible damage or shortage. If you unpack a coil weeks later and find rust or edge damage, your position is weaker unless you can show the condition was recorded on arrival.

Two principles matter:

• Inspect before you move or process. Once a coil is cut, slit, stacked or stored in your yard, the question of when a defect occurred becomes difficult to answer.
• Write it down at the time. Memory is not evidence. A contemporaneous record signed by the receiving team is.

General industry guidance suggests inspecting on arrival and notifying the supplier promptly. Your specific contract may set different notice periods, inspection locations, sampling methods or claim deadlines. Confirm the required edition of any standard named in the contract and the exact values agreed, because standards are revised and contract values often differ from standard defaults.

Step 1: Document Checks Before Opening the Coil

Start with paperwork. This is fast, cheap and often reveals mismatches before you handle the steel.

What to compare

• Purchase order and contract: grade, substrate, metallic coating designation and mass, paint system, top and back coating thickness, colour reference, gloss target, coil dimensions, coil mass, tolerances and packaging.
• Mill certificate or inspection certificate: confirm it relates to the coil identification number on the coil tag. Check that the values stated match the contract, not just that a certificate exists.
• Packing list and shipping documents: coil count, identification numbers, masses and any marks.
• Test reports: coating mass, coating thickness, adhesion, colour and gloss results where agreed. Note the test method and edition used.

Record the baseline

Photograph the coil tag and the certificate together so the identification is unambiguous. Note the date and time of arrival, the vehicle or container number and the ambient weather. If the coil arrived wet or the packaging was torn, record that before opening anything.

Step 2: Visual Inspection of Coil and Packaging

Inspect the outside of the coil and the packaging first, then the exposed surfaces as you unwrap. Use good lighting, ideally daylight or a colour-corrected lamp, and inspect from a consistent distance and angle.

Transport and handling damage

• Dented, crushed or ovalised coil edges and ends.
• Telescoping, where wraps have shifted sideways.
• Edge damage, kinks or bent wraps from lifting or strapping.
• Torn, wet or crushed packaging, and rust staining on the packaging itself.
• Moisture, condensation or water marks inside the wrapping.

Surface condition of the painted face

• Colour variation between coils or across a coil face.
• Gloss variation, mottling or haze.
• Scratches, scuffs, abrasion marks and handling marks.
• Blisters, pinholes, craters or inclusions.
• Paint skips, thin areas, streaks or roller marks.
• Edge paint condition and edge rust.
• Back-coating condition, especially where coils have rubbed in transit.

Record defects by coil identification, position (outer wrap, inner wrap, edge, face, specific wrap number where relevant), size and extent. A defect described as “some scratches” is difficult to defend. A defect described as “three parallel abrasion marks, approximately 150 mm long, on the outer two wraps, at the 3 o’clock position” is evidence.

Step 3: Dimensional and Coil Condition Checks

Measure with calibrated instruments and record the instrument used. General practice is to measure at several positions rather than a single point.

Where a standard is referenced, such as a product standard for continuously hot-dip coated steel or a test method for paint adhesion, confirm the required edition and the exact contract values. Do not assume the default values in a standard are the values in your contract.

Step 4: Sampling for Coating and Paint Tests

Sampling is where many claim files are weakest. A single test result from an unknown location proves little. A documented sampling plan does.

Build a simple sampling plan

• Select coils according to the contract or, if silent, a written plan agreed before shipment. Record how many coils were sampled and why.
• Select positions that are representative: avoid the first and last wraps where possible, and avoid obviously damaged areas when testing general coating quality. Test damaged areas separately if the defect is the subject of the claim.
• Record everything: coil identification, wrap number, distance from edge, instrument, operator, date and test method.
• Retain samples where practical, labelled and stored so they can be re-tested by a third party.

Tests commonly discussed in receiving inspection

• Paint coating thickness.
• Metallic coating mass or thickness.
• Adhesion, using the agreed method.
• Colour and gloss against an agreed reference.
• Hardness or flexibility where specified.

Test methods matter. Adhesion results, for example, depend on the method, specimen preparation and interpretation. Use the method named in the contract or agreed in writing. If the contract is silent, agree a method before testing rather than after a dispute arises.

Step 5: Photo and Record Standards for a Defensible File

Photos should answer three questions: what is the defect, where is it, and how big is it. Follow these standards.

• Context shot: the whole coil with its identification tag visible.
• Location shot: the defect in relation to the coil edge, end or wrap number.
• Close-up shot: the defect with a scale reference such as a ruler or calibrated scale card.
• Comparison shot: the defect next to a conforming area or an agreed reference sample.
• Measurement shot: instrument reading visible where a measurement is claimed.

Keep original files, not only compressed copies. Record the date, time, location and the person taking the photo. Avoid editing beyond cropping, and keep the original. If video is used, narrate the coil identification and the measurement being taken.

Build a claim file index

1. Purchase order, contract and any agreed technical specification.
2. Shipping and packing documents.
3. Mill or inspection certificate linked to coil identification.
4. Signed receiving inspection report with date, time and personnel.
5. Photo and video log with file references.
6. Measurement and test records, including instruments and methods.
7. Retained samples and their storage record.
8. Notification correspondence with the supplier, including dates and responses.
9. Description of the claimed non-conformity, quantity affected and the remedy requested.

Keep the file in one place and number the pages. A supplier or insurer should be able to follow it without asking you to reconstruct the story.

Common Mistakes That Weaken Claims

• Inspecting after processing. Once the coil is cut or formed, causation is disputed.
• Missing notification deadlines. Check the contract and transport documents for notice periods.
• Photographing defects without scale or location. The defect cannot be quantified.
• Testing without a documented sampling plan. Results are difficult to generalise.
• Using the wrong test method or edition. Results may not be comparable with the contract.
• Discarding packaging and samples. Evidence of transport damage or coating condition is lost.
• Describing defects in general terms. Vague complaints invite vague responses.
• Assuming standard defaults equal contract values. Always confirm the agreed specification.

For background on how prepainted galvanized coil is specified, see the PPGI coil page. Where the substrate is in question, the GI coil page covers galvanized substrate basics.

RFQ Checklist for Easier Receiving and Claims

Most claim disputes are easier to resolve when the specification is clear before the order. Include these points in your RFQ.

• Grade, substrate and metallic coating designation, with the standard and edition referenced.
• Paint system: primer, top coat and back coat types, and nominal coating thicknesses with tolerances.
• Colour reference and gloss target, with the measurement method and geometry.
• Coil dimensions, mass range, inner and outer diameter limits and edge condition.
• Surface quality acceptance criteria, including what counts as a defect and what is permitted.
• Test methods for adhesion, coating thickness, coating mass, colour and gloss, with editions.
• Inspection location, sampling plan and whether third-party inspection is required.
• Packaging specification, including protection against moisture and handling damage.
• Documentation to be supplied with each coil, and how coil identification is linked to certificates.
• Notification periods for visible damage, hidden defects and quantity shortages.
• Remedy provisions: replacement, credit, rework or rejection, and who bears freight and disposal costs.
• Reference samples or colour standards, and how they are stored and approved.

If price is part of the discussion, understand the cost drivers: substrate grade and metallic coating mass, paint system and coating thickness, colour and special effects, coil dimensions, tolerances, testing and inspection scope, packaging and documentation. These vary with specification and market conditions, so request a dated written quotation that states the specification and validity period rather than relying on indicative figures.

Frequently Asked Questions

How soon should I inspect a PPGI coil after arrival?

General practice is to inspect as soon as practicable after unloading and before storage, movement or processing. Your contract or transport documents may set specific notice periods, so check them and confirm any deadlines in writing with your supplier.

Can I reject a coil for a defect found after processing?

It depends on the contract and on whether you can show the defect existed at delivery. This is why receiving records, retained samples and prompt notification matter. Confirm the remedy provisions in your contract before assuming a right to reject.

Which coating tests should be routine and which should be dispute tests?

This is contract-specific. Many buyers agree routine checks such as coating thickness and visual inspection, with fuller testing such as adhesion, colour and gloss used for verification or disputes. Agree the scope, methods and editions in the RFQ.

What if the mill certificate values differ from my measurements?

First confirm you are comparing the same property, method and edition, and that the certificate relates to the correct coil identification. Then document your measurement with instrument, location and photos, and notify the supplier promptly. A third-party test may be appropriate if the difference is material.

How long will a PPGI coating last?

No fixed service life can be promised. Actual performance depends on the substrate, metallic coating, paint system, environment, forming, installation and maintenance. Discuss expected performance with your supplier in the context of your specific application and exposure.

Should I use a third-party inspector?

It can help where the specification is complex, the order value is significant or the supplier relationship is new. Agree the inspector’s scope, the sampling plan and the reporting format in advance, and make sure the inspector has the contract specification and the required standard editions.

Next Step

A receiving protocol is only as good as the specification it checks against. If you are preparing an RFQ or reviewing an existing specification, you can send your requirements, target grades and documentation needs through the ChinaCNU contact page. Include the standard editions, test methods and acceptance criteria you intend to apply, and ask for a dated written quotation that states the specification clearly. That gives your receiving team a firm baseline and makes any later claim file far easier to build.

Related Products & Get a Quote

• PPGI Coil (Prepainted Galvanized)
• GI Coil (Hot-Dip Galvanized)
• Galvanized Steel Coil

Need a price? Contact ChinaCNU Steel for a fast RFQ — Send your specifications, quantity and destination port for an order-specific quotation.