From granule sample to container order
A rubber granule sample helps you evaluate a material, but it does not automatically represent or approve a future container. Identify what the sample represents, agree the tests and acceptance limits, then document what the bulk order must meet. A small sample bottle is not a shipment certificate or a finished-system approval.
Explore the questionsMake the approval specific
- Identify the sample
Record its label, source reference, date and evaluation purpose.
- Evaluate the material
Use the agreed sample amount, methods and acceptance limits.
- Define the order
Agree the bulk specification, evidence and acceptance process in writing.
Appearance is one check
A photograph or small bottle cannot establish every property of a proposed shipment.
Sample size follows the test
Ask the laboratory or technical team what amount and handling it needs.
Approval needs a scope
Record whether you approved appearance, a material trial or a defined lot against agreed limits.
Buying and Importing
Choose the question you want to explore.
Ask what the sample represents
A reference grade and a sample from an identified lot answer different questions
Before evaluating it, record the sample label, supplier reference and date received. Ask whether it shows a typical offered grade, comes from a particular production run or was collected from an identified lot. Do not assume these descriptions mean the same thing.
A representative sample requires a suitable sampling plan. The public scope of EN 14243-2 includes sample collection and representative preparation for granule size and impurity testing. A bottle’s neat appearance does not establish that this process was followed, or that its contents represent material not yet produced.
Agree the evaluation before requesting the amount
Tell the supplier what the sample is for, then confirm what the evaluator needs
A visual check, a sieve test and a manufacturing trial can require different sample amounts and preparation. Ask your laboratory or technical team to specify the amount, packaging and handling for its planned evaluation. Confirm sample and courier arrangements separately.
RETSCH’s sample-preparation guidance explains how segregation and handling can affect the test portion. Preparation must also preserve the property being measured. Do not improvise by grinding a sample whose original particle distribution you intend to measure.
If size is the question, agree the sieve method and limits first. Our sieve-analysis guide explains the report without prescribing your acceptance limits.
Record the result and the unanswered questions
A useful approval says what passed, by which evidence and for what purpose
Keep a short evaluation record:
- Identity: the sample reference and what it represents.
- Purpose: appearance review, laboratory test or process trial.
- Requirement: the agreed method and acceptance criteria.
- Evidence: the report or trial record, with its date.
- Decision: who reviewed it, what was accepted and what remains open.
For example, ‘appearance accepted; sieve limits still to be checked’ is more useful than ‘sample approved’. It preserves the distinction between an initial selection and completion of all required checks. A manufacturing trial also needs its own documented conditions.
Translate the result into a bulk-order agreement
The order should identify the required material and how acceptance will work
Agree the material description, size distribution and other required characteristics for the proposed supply. Establish what evidence can be supplied, how the relevant lot will be identified and how any agreed sampling or inspection will be handled. Required reports are not automatically available because they appear on a buyer’s checklist.
Confirm quantity, packing, shipment terms and any shortage or nonconformity procedure separately in the order documents. Do not derive container loading from a sample bottle. The Buying guide covers the information needed for a useful commercial enquiry.
Explore the nominal granule options and factory imagery for context. Neither replaces the evidence agreed for your order.
Planning a granule evaluation?
Share the required grade, intended use, tests or trial, quantity and destination. We can discuss the sample and supporting information available for the proposed material.
Discuss your sample requirementsCommon questions
Does approving a sample approve every later shipment?
No. Define what was evaluated and agree how the proposed bulk supply will meet and demonstrate the written requirements. Sample approval should not silently become an unlimited guarantee.
Is a small bottle enough for all the tests I need?
Not necessarily. Have the laboratory or technical team confirm the amount and handling required for the actual tests or trial before arranging the sample.
Does a material report certify my finished surface?
No. It supports the particular material measurements reported. The finished surface has separate design, installation and performance requirements.