Pressed Candy OEM Packaging: Bottles, Blisters and Sachets Compared for Moisture and Shelf Life
Packaging is usually the last thing decided in a tablet project, long after formulation and process have been argued over. Then the goods sit in a warehouse for three months and come back soft, with tacky surfaces, and the packaging is suddenly suspect - by which point changing it means repeating stability work and re-filing the label. In pressed candy OEM, packaging selection should start alongside formulation sign-off, because it and the tablet's own hygroscopicity are two halves of the same problem.
1. Start with the tablet, not the material
The first question is not which pack but how thirsty the tablet is. Sugar-alcohol based tablets (sorbitol, xylitol) generally absorb little moisture. Tablets built on lactose and microcrystalline cellulose take up noticeable moisture above 75% relative humidity. Tablets containing botanical extracts, fruit and vegetable powders or probiotic powders sit at the top of the range, and the hygroscopicity of the extract itself is routinely underestimated. The practical test is a bare-tablet hold at 25°C/RH75%, recording weight gain and appearance at 0, 3, 7 and 14 days. Anything gaining more than 2% with surfaces turning tacky needs a high-barrier pack; desiccant in a standard bottle will not save it.
2. How the three main formats compare
An HDPE bottle with induction seal and desiccant is the commonest choice: moderate moisture barrier, low cost, good drop resistance, and easy to run at 60- or 90-count. Blister packs, in PVC/PVDC or PVC/aluminium, are unit-dose: each tablet sees almost no air until the moment it is pushed out, giving the best moisture and oxygen barrier, at the highest tooling and material cost. Foil laminate sachets fall between the two on cost, with barrier performance depending on the metallised and tie layers, and suit 7- or 15-day trial packs and stick formats. Roughly: unit-dose barrier ranks blister above sachet above bottle; unit cost ranks blister highest, with sachet and bottle close.
3. Cost, line speed and minimum order quantities
The best barrier is not automatically the right answer. Blister machines are slow to change over: a new tool means re-setting forming temperature and sealing pressure, so start-up waste looms large on short runs. Material suppliers typically set minimums of 300-500 kg on blister film, which can translate into hundreds of thousands of tablets - a serious cash commitment for a first order. Bottles are flexible instead: bottle, cap and label can be generic, a new SKU means a new label, and minimums are low. The usual pattern in the trade is to launch in bottles, then revisit blisters once volume justifies the tooling, both to extend shelf life and to improve the out-of-box impression.
4. Stability work is not optional
Whether a pack supports the claimed shelf life is a matter of data, not judgement. Standard practice runs an accelerated programme (commonly 40°C/RH75% at 1, 2, 3 and 6 months) alongside a long-term study, covering at least appearance, moisture, disintegration, microbiology and, where relevant, assay of the active marker. Accelerated results can support a provisional shelf life, but the long-term data decides. One trap is worth naming: accelerated studies use laboratory-standard pack conditions, while real transit - container shipping especially - can exceed them. Export orders justify a transport simulation on top.
5. Transit and warehousing damage gets overlooked
Selection also has to account for logistics. Blister cards crush at the corners over long hauls and need dividers in the carton. Glass looks premium but breaks and weighs heavily, which rarely pays in parcel channels. Foil sachets can burst at the seal under stack pressure, so seal strength and drop testing matter. Desiccant loading must also match headspace and the pack's water vapour transmission rate - plenty of projects ship with desiccant and still go damp, and the cause is usually a cap liner or a sealing temperature that was never right.
6. Working backwards from the channel
A useful route is to start from the channel. Parcel-led e-commerce chasing value: bottles first. Portability and single-dose dosing at a higher price point: blisters. Trial sizes, traffic-driving SKUs, anything meant to travel with a meal: sticks or sachets. Once the format is settled, check three things: whether the product's hygroscopicity forces a barrier upgrade, whether material minimums fit the first-order budget, and whether stability data can land before the launch date. Only when all three clear is the packaging decision actually made.
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About Guangzhou Mesen Health Biotechnology Co., Ltd
Guangzhou Mesen Health Biotechnology Co., Ltd is located in the Huashan Science and Technology Park, Huadu District, Guangzhou. The company has focused on OEM and ODM services for the big health industry for nearly 20 years, operating dedicated research, production, sales and management centres, and maintaining long-term strategic partnerships with well-known Chinese medicine colleges and research institutions. Capabilities span pressed candy, gummies, capsules, solid beverages, herbal teas, plant beverages, protein powders, dietary supplements and enzyme jelly - from formulation development through contract manufacturing. For details on minimum order quantities, sampling lead times and quotations, see our manufacturing advantages and product range, or contact us for a tailored proposal.
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