The test task determines sample needs
Model range
Differences in composition and design.
Test methods
Required operations and characteristics.
Agreed sampling
Which samples, how many and in what condition.
Why there is no universal sample count
Methods use samples differently. Some assess a finished item without consuming it; others destroy the sample or use up material. Additional units may be needed for different properties, repeated operations or retention where required. A justified quantity comes from the test programme, not an arbitrary “always three pieces” rule.
For a model range, establish which samples represent the declared products. Differences in composition, materials, design and protective properties may require multiple groups. Sending the most convenient variant does not automatically extend its results to all other models.
Who samples and what is recorded
The applicable scheme determines sampling arrangements and participants. Certification and declaration may follow different rules, so agree the method in advance. Records must connect the tested sample with its manufacturer, model and covered batch or serial production. Photographs help but do not replace required records.
How to prepare the shipment
Preserve factory identification, completeness and transport conditions. For equipment, agree power supplies, fixtures and instructions; for perishable or sensitive products, agree temperature and transit time. Clarify return, retention or disposal after testing. Transport damage can prevent valid testing.
A practical example
Example: gloves made from different materials
An importer offers gloves with different coatings and claimed protection. One visually similar sample may not represent the entire range. Materials and protective properties are compared before defining groups and tests. The laboratory and certification body agree sample requirements within their respective roles. The customer can then understand the quantity and which models the outcome covers.
What to do next
Agree the programme
Provide the model range and obtain the rationale for representative samples and quantities.
Document selection
Follow the prescribed process and retain records linking samples to the assessed products.
Arrange transport
Confirm completeness, packaging and acceptance conditions. Arrange import customs requirements separately.
What to watch for
Do not send arbitrary samples or substitute another composition or model. Tested products must represent the goods intended for manufacture or supply.
Official sources
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