PET / PETE

PET — polyethylene terephthalate, recycling code 1 — is the clear, light plastic of single-use water bottles, soft-drink bottles, and many food jars and trays. Chemically, it's the same polymer as polyester fabric, just in solid form. It's strong for its weight, holds carbonation well, and is the most recycled plastic worldwide. One myth worth clearing up front: PET does not contain BPA — that's a different plastic entirely.

It's glass-clear, shatterproof, very light, and cheap — a 500 ml PET bottle weighs a tenth of its glass equivalent, which transforms shipping costs. It seals in fizz, resists most foods, and recycles more readily than other plastics, returning as new bottles (rPET) or polyester fibre. For packaging engineers, it's hard to beat for cold drinks and shelf-stable foods, which is why it dominates that shelf.

PET, PETE, polyethylene terephthalate, or resin code 1 — the number 1 inside the recycling triangle, moulded into the base. Recycled versions appear as rPET or "made from recycled bottles." In clothing, the same polymer is simply called polyester. As with all resin codes, the 1 is a recycling-sorting mark, not a safety grade.

Water and soft-drink bottles, juice bottles, cooking-oil bottles, peanut-butter and condiment jars, salad and fruit trays, mouthwash and shampoo bottles, and some cleaner bottles. Indirectly, it's also in your wardrobe — polyester fabric and recycled-bottle fleece are PET in fibre form. If a clear plastic container held a drink or wet food, it's very likely code 1.

Through what migrates into the drink or food. PET is made using antimony trioxide as a catalyst, and trace antimony remains in the plastic — small amounts migrate into contents, increasing with heat and storage time. Studies have also found microplastic particles in bottled water, partly from caps and bottle wear. Levels usually sit under regulatory limits; warmth, sunlight, long shelf-time, and battered reused bottles push them upward.

There's no PET-specific pregnancy finding to point to, and the bisphenol concern many people associate with bottles doesn't apply — PET contains no BPA. The reasonable precautions are general ones: pregnancy is a fine time to move daily hydration to stainless or glass, skip bottles that have cooked in a car, and not stockpile bottled water in warm storage. Those steps address both the antimony and microplastic questions at near-zero cost.

No direct evidence links PET bottles to male fertility outcomes. Some laboratory studies have explored whether PET-bottled water shows weak hormone-like activity, with mixed and debated results — it remains an open research question rather than an established effect. The practical response is proportionate: a reusable bottle for daily use, fresh rather than heat-stressed bottled drinks, and attention saved for better-evidenced exposures like phthalates.

Children drink more per kilo of body weight, so drink packaging matters a bit more for them. Bottled water and juice in PET are fine as designed — bought fresh, kept cool, drunk soon. The habits to skip: giving kids bottles that sat in a hot car, and letting a single-use bottle become a weeks-long school bottle, where scratches, wear, and tricky cleaning all work against you. A stainless kids' bottle solves it once.

Nothing in the research singles out older adults for PET. The same low-effort defaults apply at any age — fresh and cool over heat-stressed, and a proper reusable bottle for everyday use.

Three solid findings. PET is a low-migration plastic for its designed use, cleared by FDA and EFSA, with no bisphenols or phthalate plasticisers in the polymer. Antimony migration is real and well measured — it rises with temperature and storage time but typically stays below drinking-water limits. And bottled water contains measurable microplastic particles, as NIH-funded work has shown, though what those particles mean for health is still being worked out.

Low for the normal pattern — a cool bottle, drunk soon after buying. The picture worsens at the edges: bottles stored hot or in sunlight, drinks kept months past bottling, and single-use bottles refilled for weeks. Even then, measured levels usually sit within regulatory limits, so this is a "tidy up the edges" material rather than an urgent one. Honest summary: the habit matters more than the bottle.

For daily hydration, stainless steel or glass bottles — built for reuse, easy to wash properly, nothing to migrate. For water at home, tap (filtered if you like) beats a bottled-water habit where the supply is good. For food, glass jars are the lower-migration choice for things you store long-term. None of this means refusing a PET bottle on a hot day out — it means not building your routine around them.

Easy — this is one of the cheapest wins in the app. One reusable bottle replaces hundreds of PET bottles a year, saves money within weeks, and removes the reuse, heat, and storage questions in one move. Occasional PET is hard to avoid entirely (travel, events, guests) and doesn't need to be. The goal is changing the default, not policing every drink.

If there's a water bottle rolling around your car right now, recycle it rather than drinking it — heat and sunlight are exactly the conditions that increase migration. Then put a stainless or glass bottle by your keys tonight so it becomes the default tomorrow. Two minutes, done.

PET does its designed job — one cool drink — reasonably well, and it deserves neither panic nor a permanent role in your routine. Buy it fresh, keep it cool, drink it soon, recycle it once. Give the everyday job to a bottle designed for everyday use. If you do those two things, you've handled essentially the whole PET question.

FDA's food-contact pages, EFSA's work on antimony migration from PET, WHO's guidance on antimony in drinking water, and NIH research on plastic particles in bottled water. See References below.