A-PET vs rPET vs PVC vs HIPS: choosing the right sheet

Which sheets does Eagle Thermo actually form?

Four: A-PET, rPET, PVC and HIPS, from 200 to 2000 micron. We do not form PETG and we do not form PP, and we will say so on the first call rather than take an order and struggle.

There is a reason to limit the list. Every material has a heater profile, a forming window, a cooling behaviour and a set of failure modes that a forming room learns over years. Running four sheets across 10 lakh pieces a month means the settings are known, the scrap rate is known, and a new job starts from a position of knowledge rather than experiment. A shop that claims to form everything is usually experimenting on your order.

The other thing worth saying up front: the rPET and the HIPS we use are recycled as standard. Not a premium line, not a special order — the default. Over half our total output runs on recycled material, and it ships with a self-certified recycled-content declaration.

What is the real difference between A-PET and rPET?

They are the same polymer. A-PET is amorphous PET sheet from virgin resin; rPET sheet carries recycled PET, usually reclaimed from post-consumer bottles. Formability, stiffness and temperature behaviour are effectively identical. The differences are optical and documentary.

Most rPET sheet is co-extruded as a three-layer structure with the recycled material in the core and thinner skins either side. That construction does two useful things: it puts the recycled content where it contributes stiffness, and it gives the sheet a consistent surface for forming and printing.

What changes in practice:

• Clarity. rPET is slightly less water-clear than virgin A-PET and may carry a faint grey or blue cast. Against a printed card, in a retail blister, holding a black electronic component — nobody sees it. Against a white cosmetic bottle at eye level in a lit display, a discerning brand manager sometimes does.
• Batch consistency. Recycled feedstock varies more than virgin resin, so the tint can shift slightly between lots. On a repeat SKU we hold to a batch reference.
• Paperwork. This is the real difference. rPET comes with a recycled-content declaration you can put in an EPR file. Virgin A-PET does not, and cannot.
• Cost. rPET generally sits below virgin A-PET, though the gap moves with the polymer market.

The one thing rPET is not automatically is food-contact approved. Recycled content and food contact are two separate approvals with two separate routes, which is covered in food-grade rPET in India.

How do the four sheets compare, property by property?

A-PET and rPET lead on clarity and toughness, PVC on detail and forming window, HIPS on cost per part and ease of secondary operations. There is no all-round winner, which is exactly why we keep four.

Current sheet rates per kilogram for each material and the gauge bands we hold in stock: CONFIRM — a four-row rate table with the date it was last reviewed, since polymer prices move month to month.

Which material gives the best clarity?

A-PET, clearly and by design. It is the material to specify when the customer's buying decision is made through the pack — cosmetics, premium accessories, food display, anything on a lit shelf.

Clarity in a formed part is not only about the sheet. It is also about how the sheet was stretched. A-PET holds its transparency through a deep draw without the stress whitening you see in some other polymers, and it does not haze at a sharp corner. That combination — clear when flat and still clear when drawn — is why it dominates retail blisters and clamshells.

PVC is very good and slightly warmer in tone. At heavy gauge it can show a faint tint, and it yellows over long UV exposure, which matters for a pack that sits in a window display for a year and does not matter for a pack that sells in a fortnight.

rPET is a small step behind A-PET. HIPS is not in the conversation — it is an opaque material, available in white, black and other colours, and it is chosen precisely for the times when you do not want to see through the pack.

Which sheet is stiffest, and which feels most premium?

PET is the stiffest of the four at a given gauge, and it also has the best impact toughness, so a PET tray feels solid without needing to be thick. HIPS at the same gauge feels lighter and more flexible — sometimes an advantage, sometimes not.

There is a distinction worth making between stiffness and toughness. Stiffness is how much a wall resists bending; toughness is what happens when you push past that. PET scores well on both — it bends and springs back, and when it finally fails it tends to deform rather than shatter. PVC is stiff but becomes brittle in cold conditions, which matters for a pack that will travel through a North Indian winter or sit in a chilled cabinet. HIPS is rubber-modified polystyrene precisely to avoid the brittleness of plain polystyrene, and it is perfectly robust in an insert or a dunnage tray, but it will not feel like PET in the hand.

Remember that perceived rigidity is at least as much geometry as material. A rib, a stepped wall or a rolled flange stiffens a thin tray far more effectively than another 100 micron of sheet, and costs nothing per part once it is in the mould.

Which forms the finest detail and the deepest draw?

PVC has the widest forming window and picks up the finest surface detail. HIPS is close behind and very tolerant. A-PET and rPET need tighter heater control, but once dialled in they draw deep and stay clear.

Forming window is the range of sheet temperature over which a material forms well. A wide window forgives an uneven heater, a draughty day, a sheet that sat too long. PVC's window is wide, which is why it survived so long in fine cosmetic inserts and confectionery trays where a crisp edge is the whole point.

PET is less forgiving. Too cold and it will not reach the corners; too hot and it sags and forms webs between cavities. It rewards a well-profiled heater bank and punishes guesswork. That is a process problem, not a material problem, and it is solved by knowing the material — which is the argument for a shop that runs four sheets instead of twelve.

On draw depth, our envelope is up to 75 mm with a maximum forming area of 600 × 600 mm, and all four sheets will reach it. What differs is what the corner looks like when they get there and how much starting gauge you needed to spend. The design rules that govern this — draw ratio, radii, draft — are in designing for thermoforming.

How much heat can each material take?

Very little, in all four cases. A-PET and rPET begin to distort somewhere above 65 to 70 °C, HIPS is marginally better, PVC is no better. None of them is a hot-fill, oven or microwave material.

This is the specification that gets missed most often, usually late. A tray is approved on a desk in March and fails in a container in May because nobody asked what the inside of a truck reaches in Rajasthan. If your pack will see sustained heat — a hot-fill process, a sterilisation cycle, an oven, a summer warehouse without ventilation — say so before tooling, because the answer may be a different material family altogether and we would rather tell you than sell you a tray that slumps.

At the cold end, PET is comfortable down to freezer temperatures and stays tough. PVC becomes noticeably brittle when cold, so a PVC clamshell that survives a drop test at 25 °C may crack at 5 °C. If the pack will be chilled or shipped through winter, test it chilled.

Which sheets can be used for food contact?

Virgin A-PET, PVC and HIPS are all available in food-contact grades with material documentation from the sheet maker. Recycled PET for direct food contact is a separate matter with its own regulatory route, and it should never be assumed.

The practical points to hold on to:

• The grade matters, not the polymer. "It is PET so it is food safe" is not an argument. What you need is the sheet manufacturer's documentation for the specific grade and batch.
• Direct and indirect contact are different questions. A confectionery insert that touches a wrapped chocolate is a different regulatory conversation from a tray that touches an unwrapped one.
• Recycled content changes the route. FSSAI's 2025 guidelines opened a defined path for recycled PET as a food contact material, with decontamination and testing requirements the recycler must satisfy. That is explained in food-grade rPET in India.
• Ask for the paperwork before tooling, not after. Documentation problems found at the pre-dispatch stage are the most expensive kind.

We form in a controlled forming room — filtered air, gowning, restricted entry, segregated material handling and batch traceability. It is a controlled environment for hygiene-sensitive work; it is not a formally ISO-classified cleanroom, and we do not describe it as one.

Which material prints, seals and folds best?

PVC is the best all-rounder for converting: it prints well, heat seals to coated card readily, and it is the only one of the four that will seal under radio frequency. HIPS prints beautifully. PET needs the right coating to seal, and folds better than any of them.

The distinctions that matter on a packing line:

• Heat sealing to card. A retail blister is usually sealed to a heat-seal-coated card. PVC has traditionally been the easiest partner. PET seals reliably too, provided the card carries a PET-compatible coating — get this wrong and you have a pack that peels in the shop.
• RF sealing. High-frequency welding works on polar materials, which among these four means PVC alone. If your existing line is an RF sealer, that constrains the material choice immediately.
• Folding blisters. A folding blister is formed flat, punched, then folded on a crease so the pack closes on itself. PET and PVC take the fold cleanly. HIPS needs more care on the crease. We punch and fold in-house, so the whole sequence stays under one roof.
• Printing. HIPS and PVC take ink readily. PET needs surface treatment for good adhesion. In practice most retail packs put the print on the card and leave the formed part clear, which sidesteps the question.

What gauge should I specify for my application?

Gauge follows depth and duty, not preference. As a rough map: light retail blisters at the bottom of our range, medical and industrial trays in the middle, reusable dunnage at the top.

Treat these as starting points, not specifications. The right gauge for your part depends on its draw depth, its corner radii and what the tray has to survive. A 60 mm deep tray at 300 micron and a 20 mm deep tray at 300 micron are not the same product in the hand.

Which industries choose which material?

Retail and cosmetics reach for clear PET, medical for PET and HIPS, automotive and electronics for heavy HIPS, confectionery and fine inserts for PVC. The pattern follows what each sector is buying: visibility, rigidity or detail.

We form across all of these. The supplier audits we have passed — IKEA, Pigeon, Healthium, Auxein and Minda Corp — cover very different requirements, which is a useful discipline: a homeware retailer's recycled-content questions and a medical customer's traceability questions are not the same questions.

How do I choose in three questions?

Does the customer need to see the product, does the pack need to survive heat or cold, and does it need to carry recycled content? Those three answers narrow four materials to one in almost every case.

1. Must the product be visible? If no, go straight to HIPS and stop — it will be the cheapest finished tray and the easiest to print. If yes, you are choosing among A-PET, rPET and PVC.
2. Does it need recycled content? If yes, rPET is the answer for a clear pack and recycled HIPS for an opaque one. Both are standard here, both come with the declaration.
3. Will it get cold, or does the display have to be perfect? Cold or drop-critical, choose PET over PVC. Fine surface detail or an existing RF sealing line, choose PVC.
4. What is the draw depth? This does not change the material so much as the gauge — and therefore the price. Tell us the depth before you ask for a rate.

And if the answer genuinely is "none of these four", we will say so. Some parts want a different process entirely; that comparison is in thermoforming vs injection moulding.

Frequently asked questions