What Material Documents to Request | Outdoor Kitchen Buyer Guide

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A material claim is only as good as the document behind it. Before accepting a grade, coating or weathering statement, ask which of the items below actually exists for your configuration — and whether it is linked to the material you are buying, not a generic reference report.

1. Stainless steel grade (304 / 316)

A Mill Test Certificate (MTC) or accredited report — not a datasheet.
Report holder, sample identity and photos.
Linkage to the actual purchasing and production batch, not just the grade name.
304 is the standard grade; 316 is an order-selected upgrade — ask which one your quotation specifies.

2. Coating and surface finish

Pretreatment method and powder coating system named (brand/system, not just "powder coated").
Dry film thickness (DFT) records.
Color and batch reference matched to your order.

3. Salt-spray / corrosion performance

Report to a named standard — ISO 9227 or ASTM B117 — not an unreferenced hours figure.
Substrate and coating system in the report must match what you are ordering.
Ask for method, pass/fail criteria, cost and lead time at quotation stage, since this is typically arranged per order.

4. UV / weathering performance

Report to a named standard — ISO 16474 or ASTM G154.
Matched report scope: substrate, coating system and exposure duration.
Treat any unreferenced "UV resistant" or "lifetime weathering" claim as unverified until a report is produced.

Ask before you assume: material, coating and weathering evidence for a specific order is typically generated or collected once that order selects the grade, coating system and tests it needs — it is not a pre-existing library covering every possible configuration. A supplier who cannot say when a report will exist, only that "it can be provided," has not yet scoped your order. Ask for the evidence requirement list at quotation and the report timeline against your Technical Freeze date.

What a complete report or certificate should show

Field	Why it matters
Report name, number, issuing lab and accreditation	Confirms the report is real and traceable, not a template.
Client, manufacturer and sample name	Confirms who commissioned the test and on what.
Sample model, material grade, batch and photos	Links the paper to a physical, identifiable sample.
Substrate, pretreatment, coating system and film thickness	Confirms the test matches your actual finish, not a different system.
Test standard, conditions, duration, result and judgment	Lets you compare against the standard's pass criteria, not marketing language.
Date, page count, signature and validity	Confirms the document is current and complete, not an excerpt.
Applicable product, configuration and order scope	Confirms the report actually covers what you are buying.

KAISTEEL control: required material, coating and test evidence is defined at Technical Freeze, collected during production against the criteria above, and indexed in the order-specific Compliance Dossier before shipment release. See the dossier's material specification table for the standard grades and options offered today.

Ask for your project's evidence requirement list

Tell us the destination, grade preference and any coastal/high-exposure conditions, and we'll confirm what evidence applies to your order.

Request evidence review