How to Select a Third-Party Footwear Laboratory for a PU Slide Project

Who this article is for

This guide is for brands, importers, sourcing teams, quality managers, and wholesalers preparing third-party testing for custom PU slide sandals. It does not recommend a named laboratory and does not determine which test or regulation applies to a particular market.

Main sections

Write the test question before requesting quotations

A laboratory cannot quote accurately from please test these slides. Provide a brief that identifies:

• product type and construction;
• materials and components to be tested;
• destination market and intended user;
• test method and edition, if already selected;
• legal, buyer, retailer, or internal requirement behind the test;
• sample quantity, colours, and sizes available;
• whether the sample is development, pre-production, or production;
• whether conformity statements are required;
• required report language and delivery format;
• the purchasing decision the report must support.

If the method is unknown, ask the laboratory to propose options and explain the scope, limitations, and source of each requirement. Keep technical recommendation separate from legal interpretation.

Confirm the laboratory’s exact accredited scope

Ask for the current accreditation certificate and scope issued by the relevant accreditation body. Then compare the scope with the requested work.

Check:

• the laboratory’s legal name and physical site;
• accreditation number and current validity;
• testing accreditation under ISO/IEC 17025;
• product or material field;
• method number and edition, or the rules of an applicable flexible scope;
• measurement range or technique where relevant;
• any exclusions, suspended items, or satellite locations;
• whether the final report will identify out-of-scope tests.

ILAC G18:01/2024 describes the scope of accreditation as central to showing which services the body is competent to perform. [2] A laboratory can be competent and accredited for chemical testing while a requested mechanical footwear method remains outside its scope.

Check international recognition through the accreditation body

For cross-border purchasing, identify the body that accredited the laboratory and whether its recognition covers testing under ISO/IEC 17025.

Global Accreditation Cooperation Incorporated began full operations on 1 January 2026, taking over the international roles previously performed by ILAC and IAF and launching one MRA. Continuity arrangements may leave ILAC or IAF marks on valid certificates and reports during transition. [3]

Use the current Global ACI or relevant national accreditation-body resources to confirm recognition. If a retailer, regulator, customs authority, or customer requires a particular laboratory or scheme, obtain written acceptance before sending samples.

Confirm method capability beyond the certificate

An accredited scope is an essential check, but project execution still matters. Ask the laboratory:

• How often does it perform this method on footwear or PU components?
• Can the available sample geometry meet the method’s specimen requirements?
• What happens if a finished sandal cannot produce a standard specimen?
• Which conditioning, pre-treatment, and equipment will be used?
• Will the laboratory follow the named edition or a newer edition?
• Can it explain deviations before testing?
• Does it have the detection limit, load range, or measurement resolution needed for the requirement?
• Can it report individual specimens and failure modes?

Request a blank report format or a redacted example if available. This shows whether the final evidence will contain the details your team needs.

Separate standard, modified, and in-house methods

Ask the quotation to classify every activity:

• standard method performed within scope;
• standard method with a justified modification;
• laboratory in-house method;
• client method;
• screening test;
• subcontracted test;
• non-accredited activity.

These categories can all have a legitimate use, but they do not support the same claim. For example, an internal comparison method may be useful for development screening while a market or retailer requires a named accredited standard method.

Agree the sample plan

The laboratory should know what it will receive and what it will test. Confirm:

• pairs, components, or material quantity required;
• colours and sizes included;
• spare material for repeat or confirmation work;
• who selects the production sample;
• how samples will be sealed and identified;
• whether destructive testing prevents return;
• storage or shipping conditions;
• disposition after testing;
• chain-of-custody expectations.

For chemical testing, ask whether colours, prints, adhesives, coatings, or composite materials are separated or combined. For mechanical testing, ask where specimens will be taken and whether several results come from one pair or independent pairs.

Review the acceptance rule before the test

If the laboratory will state pass or fail, provide the correct requirement and ask which decision rule will be used. ILAC G8:09/2019 provides guidance on decision rules and conformity statements related to ISO/IEC 17025. [4]

Clarify:

• the limit and its authoritative source;
• applicable product category and market;
• units and rounding;
• whether uncertainty affects the decision;
• handling of borderline values;
• whether the laboratory is qualified to select the requirement or only to apply a requirement supplied by the client.

Do not wait until a borderline result appears to debate the rule.

Examine subcontracting and laboratory location

A single quotation can include work performed at several sites or by another laboratory. Ask which activities will be performed by the quoted laboratory, which will be subcontracted, and which organisation will issue each result.

For subcontracted work, request the performing laboratory’s accreditation details and scope. Confirm that the final report clearly identifies responsibility. Also check whether the destination market or customer accepts subcontracted results.

Compare quotations on the same scope

The lowest total price may exclude sample preparation, extra colours, compliance assessment, photographs, courier fees, taxes, repeat work, or accredited reporting.

Create a comparison sheet with:

• exact tests and methods;
• accreditation status for each test;
• sample quantity and preparation;
• number of colours or components included;
• conformity statement and limit review;
• subcontracting;
• report language and format;
• lead-time estimate;
• sample return or disposal;
• full quoted cost and exclusions.

Only compare prices after the technical scope matches.

Evaluate reporting and communication

A useful laboratory contact should ask clarifying questions before testing. Warning signs include accepting an unclear brief immediately, changing a method without explanation, refusing to identify accreditation scope, or promising universal compliance from a narrow test package.

Before appointment, agree how the laboratory will communicate:

• insufficient or damaged samples;
• method deviations;
• unexpected observations;
• results that appear borderline;
• additional work requiring approval;
• revised reports;
• data retention and confidentiality.

Use a simple laboratory scorecard

Score candidates against the actual project, not a generic reputation list. Suggested categories are:

1. exact accredited-scope match;
2. relevant footwear and PU experience;
3. method and sample-plan clarity;
4. destination-market or customer acceptance;
5. reporting completeness;
6. subcontracting transparency;
7. communication quality;
8. timing and logistics;
9. total comparable cost;
10. confidentiality and conflict-of-interest controls.

Weight the categories according to risk. For a regulatory chemical test, scope and market acceptance may outweigh speed. For an early development comparison, turnaround and practical sample handling may carry more weight.

Questions to send before appointment

• Is the requested method included in your current accredited scope at the issuing location?
• Which method edition will you use?
• What specimen type, dimensions, quantity, and conditioning are required?
• Will any work be modified, non-accredited, or subcontracted?
• Which requirement and decision rule will support any pass/fail statement?
• Will individual results, units, photos, deviations, and uncertainty information be reported where relevant?
• How will the sample be identified and retained?
• Can the accreditation body and certificate be independently verified?
• Are there destination-market, retailer, or scheme limitations we should confirm?
• What is excluded from the quotation?

FAQ

Is an ISO 9001 certificate enough for a testing laboratory?

No. ISO 9001 concerns a quality management system. ISO/IEC 17025 addresses laboratory competence and operation. Check the exact testing scope.

Must every development test be accredited?

Not necessarily. A non-accredited comparison can be useful if its purpose and limitations are clear. Regulatory, contractual, retailer, or claim-support decisions may require accredited work or a specified laboratory.

Can the factory choose the laboratory?

It can propose one, but the buyer should approve the laboratory, scope, method, sampling, requirement, and report recipient when independence or market acceptance matters.

Does a global laboratory brand guarantee the local branch has the method?

No. Accreditation and competence are linked to the named legal entity, location, and scope. Verify the site that will perform and report the work.

What if two laboratories produce different results?

Compare sample identity, preparation, conditioning, method edition, equipment, calculations, uncertainty, and decision rules before assuming one is wrong. A qualified technical review may be necessary.

Sources

[1] ISO/IEC 17025:2017. [2] ILAC G18:01/2024 on accreditation scopes. [3] Global Accreditation Cooperation Incorporated on the 2026 transition and MRA. [4] ILAC G8:09/2019 on decision rules and conformity statements. Full links and scope notes are in sources.txt.

Soft CTA

Henghao Slide Sandals Factory states that it can discuss project requirements and coordinate sample information for custom PU slides. Buyers should independently approve the laboratory, method, market scope, and acceptance criteria. Share the product, component, destination market, and proposed test question through the Buyer Help Center or Contact page. Testing scope, cost, timing, and factory support must be confirmed for the actual project.