Spice packaging material, specified around the aroma you're trying to keep.

For ground spices and blended masala, an aluminium foil laminate is the correct specification — typically PET 12µ / Alu 9µ / PE 80µ. Aluminium foil is the only layer in commercial flexible packaging that is a total barrier to oxygen, moisture, light and aroma migration, and spice degradation runs through all four paths. For whole spices, where surface area is lower and degradation is slower, a metallised structure such as PET 12µ / Met-PET 12µ / LLDPE 100µ is usually sufficient and costs less. Transparent structures should not be used for ground spice on any meaningful shelf life.

Three separate mechanisms, and they are often confused. First, oxidation — oxygen entering through the film reacts with the essential oils that carry aroma. Second, permeation — the volatile compounds pass out through the film, which is why a weak barrier loses aroma even in a sealed pack. Third, aroma scalping — the inner polyethylene sealant absorbs aromatic compounds directly out of the product, so the aroma never leaves the pack but is no longer available to the consumer. A foil barrier addresses the first two completely; the third is managed through sealant selection and thickness.

PET 12µ / Alu 9µ / PE 80µ. Turmeric has a specific problem the other spices do not: curcumin, the compound responsible for its colour, degrades under light. A structure that handles oxygen well but lets light through will hold the aroma and lose the colour, and colour is what the consumer judges turmeric on at the point of purchase. Aluminium foil is a total light barrier, which is why it is the standard rather than the premium option here. If the brand requires product visibility, place the window on the reverse face and keep it small — every square centimetre of window is a fade path.

As working guidance, an aluminium foil structure supports twelve months or more of meaningful aroma retention on ground spice; a metallised PET structure supports six to nine months; a metallised BOPP structure four to six months; a transparent structure is not appropriate for ground spice at all. These are planning figures, not guarantees — actual shelf life depends on the spice, the fineness of the grind, moisture content at fill, the fill environment and storage conditions. The reliable way to confirm a target for your own product is an accelerated shelf-life study in the actual structure.

Whole spices have far lower surface area than ground spice, so they degrade more slowly and the barrier requirement eases — a metallised structure such as PET 12µ / Met-PET 12µ / LLDPE 100µ is usually adequate. What tightens instead is the mechanical requirement. Cloves, cardamom pods, cinnamon bark and black pepper are hard and irregularly shaped, and they abrade or puncture a thin sealant during transit. A heavier sealant of 100 microns or more is standard. Whole spice is also the category where consumers most want to see the product, so windowed pouches are common and acceptable here in a way they are not for ground turmeric or chilli.

Moisture. Ground spice is hygroscopic — it pulls water vapour from the surrounding atmosphere, and once the moisture content rises past a threshold the powder binds into lumps and stops free-flowing. The moisture either enters through the film, which is a water vapour transmission problem solved by the barrier layer, or it was already in the product at fill, which is a process problem upstream of packaging. Caking is a visible quality complaint even though the product remains perfectly safe, and it is the single most common consumer-facing failure in humid distribution. A foil structure with a WVTR below 0.1 effectively removes the packaging side of the problem.

Indian retail masala runs across a wide range and the format changes with it. Sachets of 5 to 20 grams are three-side seal, used for single-use and trial packs. Retail packs of 50 to 200 grams are typically centre seal pouches, which run fastest on vertical form-fill-seal lines. Packs of 100 grams to 1 kilogram move to stand-up pouches with a zipper, since the consumer opens them repeatedly. Bulk and trade packs of 5 to 25 kilograms use heavy-sealant liners built for stacking. The format decision follows the filling machine as much as the fill weight.

Aroma scalping is the absorption of aromatic compounds from the product into the packaging film itself, usually into the inner polyethylene sealant layer. It is distinct from permeation — nothing escapes the pack, but the aroma migrates into the film and is no longer released when the consumer opens it. Polyethylene is more prone to scalping than cast polypropylene, and thicker sealants absorb more than thin ones, which is one reason a heavier sealant is not automatically better for aromatic products. For highly aromatic blends it is worth discussing sealant chemistry rather than defaulting to standard LDPE.

Once free oil is present the problem shifts from permeation to chemical resistance. Oil softens polyethylene sealants and, over months, oleoresins from clove, cardamom and pepper attack conventional lamination adhesives — producing delamination that usually starts at the seal edge. The standard answer is PET 12µ / Alu 9µ / CPP 60µ: cast polypropylene resists oil migration and holds seal integrity where polyethylene does not, and a high-performance adhesive system is specified rather than a standard one. This should be decided at specification stage, because delamination shows up months after dispatch.

Bulk packs of 5 to 25 kilograms carry a barrier requirement that is often underestimated, because bulk spice frequently sits in a warehouse longer than retail stock ever does on a shelf. A structure such as PET 12µ / Alu 9µ / LLDPE 120µ is typical — the barrier matches a retail foil pack, but the sealant is substantially heavier to handle stacking load, forklift handling and the abrasion of a large fill. Bond strength between layers matters more here than on any retail format, since a bulk pack failure is a full consignment loss rather than a single unit.

Yes. We print up to 8 colours by rotogravure in-house using food-grade ink systems. Rotogravure carries a one-time cylinder cost per design but delivers excellent registration and shade consistency across repeat runs — a meaningful advantage for a masala brand reordering the same artwork several times a year, where a shade drift between batches puts two versions of the same pack on a shelf simultaneously. Finish options include gloss, matt, soft-touch matt, spot gloss and registered matt-gloss. Artwork is pre-press checked and colour-proofed before the cylinder is engraved.

Conventional spice laminates combine polyester, aluminium and polyethylene, and those layers cannot be economically separated, so they generally go to energy recovery rather than material recycling. Mono-material structures are the route where recyclability is a brand commitment — an all-polyethylene laminate is recyclable through PE streams, with barrier recovered through metallisation or coating rather than by mixing polymer families. Mono-material PE structures are available on request. The honest trade-off is that they deliver a lower barrier than foil, so the shelf-life target has to be re-checked before switching. For ground turmeric and chilli in particular, the loss of a total light barrier is a real cost that should be weighed rather than assumed away.

Minimum order quantity depends on the structure, whether the job is printed or unprinted, and how many designs are involved, because cylinder cost is amortised across the run. Unprinted laminate carries a lower minimum than custom-printed material, and repeat orders against an existing cylinder set are lower again than a first run. Rather than publish a number that will not match your job, we confirm MOQ against your specific structure and artwork at the inquiry stage. Sample material for line trials is available before any bulk commitment.