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Best before date
Can a wax which has passed its best before date by 6 months still be used in a formulation or discarded?
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5 Replies
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Does it still meet the original specifications on the Certificate of Analysis? If so, then probably yes. If not, then probably no.
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Thanks @Perry
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@Perry - Good point Agreed ,
,"y":534,"w":0,"h":18,"abs_x":384,"abs_y":1535}”>@oladoo - It also depends on what type of formulation you involve , you can also add preservative on final product , Yes but fully agree COA as per Mr.Perry is highly advisable -
Several producers/suppliers don’t have “best before dates” on their stocked products but “retest dates”. That’s not just cosmetics but also pharmaceuticals; either you discard at that date or you retest for purity (e.g. decomposition) according to for example Pharmacopoeia Europea standards. This may involve melting point, IR spectrum, thin-layer chromatography/HPLC/GC, chemical reactions, just to name a few. Melting point, if known (i.e. done upon arrival), is a good measure. IR might not necessarily tell you something about impurities/degradation, chromatography can be a reliable tool for retesting, whereas chemical reactions are only useful in special cases if a precise degradation product is targeted. Microbial contamination can also be an issue which has to be addressed.
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