Polyethylene Terephthalate (PET) and Polystyrene (PS / HIPS) are the two most quoted sheet materials for thermoformed seedling and nursery trays in agriculture and horticulture projects. Both run well on standard thermoforming equipment, but they differ in clarity, toughness and sealing.
The notes below come from day to day production and export work with overseas buyers.
This category covers a family of products rather than a single item. In practice a buyer defines thermoformed seedling and nursery trays 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 vented and ribbed cell walls; cell volume 10 to 150 ml; standard 540 x 280 mm footprints. Materials most often specified are Polyethylene Terephthalate, Polypropylene, Polystyrene, Polylactic Acid, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.
In the agriculture and horticulture sector the decision is usually driven by UV stability and stack strength, with cell geometry as a secondary requirement. Typical end uses include produce punnets, grow trays, nursery trays.
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 |
|---|---|---|---|
| Polyethylene Terephthalate | 1.35-1.40 g/cm³ | 50-70 MPa | -40°C to 70°C |
| Polylactic Acid | 1.24 g/cm³ | 50-60 MPa | up to 55°C (HDT) |
| Polystyrene | 1.04-1.06 g/cm³ | 30-50 MPa | -20°C to 70°C |
Polyethylene Terephthalate is frequently the default selection here: High IV PET resin is the reason a 1.5 L bottle can be light yet hold carbonation pressure.
Polyethylene Terephthalate grades offer excellent barrier to CO2 and moisture, while Polystyrene brings rigid and glossy. For agriculture and horticulture service the difference shows up in impact strength and in the long term behaviour under load.
Both materials can be validated quickly with a small sample run, which is the cheapest way to settle the argument for your own application.
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.
The route below is the one most factories use for this type of part.
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.
We can provide ISO 9001 quality system documentation, material certificates, RoHS and REACH statements, and where applicable food contact, flame retardancy or drinking water approvals. Tell us your target market and we will match the document set.
Standard production tolerance follows the relevant ISO or DIN tolerance class for the process; tighter tolerances are possible after machining or grinding, but they add cost. Define the tolerance only on the functional dimensions.
Yes. {mat1} is one of our regular materials for this item, and we can supply virgin, modified and certified grades with full traceability. Material certificates and test reports are issued per batch.
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.
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.
Our team supplies thermoformed seedling and nursery trays to agriculture and horticulture customers worldwide, with samples, material certificates and full inspection reports available before mass production.
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