The value of many analyses depends on the samples not being contaminated, fermented or decomposed. The following suggestions are to ensure that the samples arrive intact and in a condition to analyze in a meaningful fashion.

Samples should be packed tightly in bubble plastic, styrofoam nuggets or similar material so that they do not break.
Screw-cap bottles leak! These should be capped tightly and taped shut with waterproof tape.
Label each sample clearly. NOTE: labels come off frozen samples; please wrap a rubber band around labels on frozen samples.
Preservatives generally should not be added to samples. If preservatives have been added, please identify them.
Freezing will often prevent fermentation and decomposition. Storing the sample in a freezer overnight before shipment, or shipping it packed in "blue ice" will usually preserve it. Samples for microbiology analysis should not be frozen.
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Ship perishable samples by overnight delivery service. Try to avoid shipping on Fridays those products which require refrigeration; a weekend in a hot warehouse may render the analyses useless.
Identifying paperwork should accompany each shipment: it should NOT be sent under separate cover. Our sample submission form may be copied and used for this purpose.

If you prefer to use your own forms, you should include: analyses requested; name and address to which the results should be sent; telephone number to call in case of questions or problems; name and address to which the invoice should be sent; any special instructions; sample description; your sample number; purchase order or authorization number if required by your firm.
Labels often become illegible in transit; please avoid writing analytical and reporting requirements on the sample label.
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