Which Materials Are Used in Cosmetic and Pharmaceutical Packaging?

The Short Answer

Rigid plastic packaging is dominated by five materials: polypropylene, polyethylene terephthalate, polystyrene, high-density polyethylene and ABS. Each brings a distinct combination of clarity, chemical resistance, toughness and cost. Elastomers appear in teats, gaskets and valves, and glass remains relevant for premium serums and for products where inertness is critical. Choosing among them is a compatibility question first and a cost question second.

Polypropylene

PP is the workhorse of cosmetic packaging. It resists alcohols, glycols and most emulsifier systems, tolerates moderate heat, and molds with integral hinges, which makes it the standard for flip-top caps. It is naturally translucent and becomes opaque with fillers or pigments. Its weaknesses are lower stiffness than PS or PET, higher shrinkage during molding, and low surface energy, which requires treatment before printing. For jars that must survive parcel shipping, PP's toughness usually outweighs its lower clarity.

PET and PETG

PET offers good clarity, high strength-to-weight ratio and an effective barrier to oxygen and carbon dioxide, which is why it dominates clear bottles. It is produced by injection stretch blow molding for bottles and by injection molding for jars and thick sections. PET is sensitive to hydrolysis at elevated temperature, so hot filling requires validation or a heat-set grade. PETG is easier to injection mold in thick sections and is often used for small jars where clarity matters more than barrier.

Polystyrene, HDPE and ABS

PS delivers the highest clarity at low cost and is common in thin-walled cream jars, but it is brittle and attacks easily by solvents such as limonene and some fragrance concentrates. HDPE is opaque, tough and chemically broad, and it is the standard for solid dosage bottles where moisture control matters. ABS is used for caps because it takes a fine surface finish, accepts metallisation and provides good dimensional stability; it is not usually chosen for direct product contact.

Elastomers and Glass

Teats, gaskets and valve components use natural rubber, nitrile or silicone. Natural rubber gives excellent elasticity but degrades with oils and can carry odor; nitrile and silicone resist oils better and are preferred for essential-oil products. Glass remains the reference material for inertness and premium perception, particularly for serums and fragrance, at the cost of weight and breakage risk. For pharmaceutical products, the container-closure system is assessed as a whole, so material choice cannot be separated from the seal and the closure.

Compliance Considerations

• Request material declarations naming the resin family and additive classes.
• Confirm the regulatory basis of any food-contact or cosmetic-compliance claim.
• Check solvent compatibility for fragrance-heavy or alcohol-based formulas.
• Verify that colorants are suitable for the intended contact type.
• Assess recycled content separately, since it changes the extractables profile.
• Test the finished pack with the real formula rather than a simulant.

How Wall Section Changes Performance

The same resin behaves differently depending on how much of it there is. A one-millimetre polystyrene wall is bright and glass-like but brittle; the same resin at two millimetres looks similar and survives far more handling. Polypropylene at one millimetre flexes visibly when squeezed, which may be acceptable for a tube but not for a jar expected to feel rigid. Thickness also governs how much the pack resists thread deformation under capping torque. When comparing materials, therefore, compare them at the wall section you will actually use, not at the thickness the material data sheet assumes.

A Step-by-Step Selection Method

Start by listing what the package must resist: the formula's solvents, the filling temperature, the transport route and the expected shelf life. Next, convert those into material properties: chemical resistance, heat deflection, impact strength and barrier. Then shortlist two candidates and test both with the real product in the intended wall section. Finally, weigh cost, decoration compatibility and recyclability. This order matters because it prevents appearance from deciding the material before function has been settled, which is the most common cause of a pack that photographs well and fails in the field.

Conclusion

Material selection starts with the formula and the transport route, not with appearance. PP covers most cosmetic needs, PET covers clear bottles, PS covers decorative jars with benign contents, HDPE covers solid dosage, and ABS covers caps. Elastomer and glass choices follow the same logic: match the material to what it must resist.

References

• ISO 472:2013, Plastics — Vocabulary.
• ISO 1183-1:2019, Plastics — Methods for determining the density of non-cellular plastics.
• EU Regulation No 10/2011 on plastic materials and articles intended to come into contact with food.
• Regulation (EC) No 1223/2009 on cosmetic products.
• USP <661>, Plastic Packaging Systems and Their Materials of Construction.
• 21 CFR 177, Indirect Food Additives: Polymers. U.S. Food and Drug Administration.