If you specify Polystyrene (PS / HIPS) for thermoformed lids and domes, a handful of properties decide whether the part survives forming and service. These are the values worth checking on every data sheet.
Everything here can be checked on a real sample before you commit to a production order.
This category covers a family of products rather than a single item. In practice a buyer defines thermoformed lids and domes by three things: the base resin, the format or dimension, and the performance or certification level it has to meet. Typical options in this category include flat, dome and high clearance designs; fitting 90 to 260 mm containers; gauge 0.25 to 0.60 mm. Materials most often specified are Recycled PET, Polypropylene, Polylactic Acid, Polystyrene, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.
In the food and beverage sector the decision is usually driven by food contact compliance and migration limits, with seal integrity as a secondary requirement. Typical end uses include takeaway containers, fresh produce punnets, dairy tubs.
These figures are typical for commercial grades and should be confirmed against the supplier's certificate for your specific lot.
| Material | Density | Tensile strength | Service temperature |
|---|---|---|---|
| Polystyrene | 1.04-1.06 g/cm³ | 30-50 MPa | -20°C to 70°C |
| Polypropylene | 0.90-0.91 g/cm³ | 25-40 MPa | -10°C to 100°C |
| Polylactic Acid | 1.24 g/cm³ | 50-60 MPa | up to 55°C (HDT) |
Polystyrene is frequently the default selection here: HIPS is the default thermoforming sheet for food packaging and appliance liners.
Typical values for a general purpose grade are listed below; filled, stabilised and speciality compounds will differ.
Density 1.04-1.06 g/cm³, tensile strength 30-50 MPa, continuous service temperature -20°C to 70°C and melt range 180-240°C are the four values to circle on the data sheet. Everything else is secondary for most food and beverage projects.
Beyond the base resin, most suppliers offer UV stabilised, food contact, flame retardant, anti-static and recycled content versions of the same product. Ask which additive package is included, because it is often the difference between a part that lasts three years and one that lasts ten.
Each step below has its own control points, and skipping one of them is where most defects start.
Secondary operations such as printing, welding, machining and assembly are often cheaper to do in the same factory, and they reduce the risk of mismatch between components.
These are the criteria that actually predict whether the part will perform in service.
Send this list to your supplier with the drawing and you will receive comparable quotations from every factory you contact.
Yes. Standard samples are normally free of charge and shipped within three working days; custom samples are charged at cost and credited against the first production order.
Colour is controlled with a masterbatch reference approved by the customer, and every production lot is checked against the approved sample under standard lighting before shipment.
Standard packing is export cartons on fumigation-free pallets, with custom labelling, barcode and retail packing available. We also handle consolidated containers and door to door delivery.
A new tool typically takes 25 to 45 days depending on cavity count and complexity, followed by T1 samples within one week. Existing tools can usually start production within 10 to 15 days of order confirmation.
For standard sizes and colours the minimum is usually one pallet or one production run; for custom tooling the economic minimum depends on the tooling cost amortised over the expected volume. Send us your annual volume and we will calculate the break even point.
Our team supplies thermoformed lids and domes to food and beverage customers worldwide, with samples, material certificates and full inspection reports available before mass production.
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