Specification sheets for plastic rods and bars are full of abbreviations. This guide translates the dimensions, grades and tolerance classes into decisions you can actually make.
This guide is written for engineers, purchasers and project managers who need a practical answer, not a resin data sheet.
This category covers a family of products rather than a single item. In practice a buyer defines plastic rods and bars 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 length 1000 mm and 2000 mm; natural, black and coloured; ground tolerance h9. Materials most often specified are Polymethyl Methacrylate, Polyoxymethylene, Polyvinyl Chloride, UHMWPE, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.
In the water and wastewater treatment sector the decision is usually driven by drinking water approval and biofilm support, with corrosion free service as a secondary requirement. Typical end uses include filter housings, MBBR bio media, pipework.
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 |
|---|---|---|---|
| Polypropylene | 0.90-0.91 g/cm³ | 25-40 MPa | -10°C to 100°C |
| Polytetrafluoroethylene | 2.15-2.20 g/cm³ | 20-35 MPa | -200°C to 260°C |
| Polyoxymethylene | 1.41 g/cm³ | 60-70 MPa | -40°C to 100°C |
Polyvinyl Chloride is frequently the default selection here: PVC can be formulated from rigid pipe compound to soft medical grade by changing plasticiser content.
These figures are typical for commercial grades and should be confirmed against the supplier's certificate for your specific lot.
When you read a supplier quotation, check that the dimension, the resin grade, the colour reference and the tolerance class are all stated. A quotation that only gives a price per piece is not comparable between suppliers.
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.
Processing method drives both cost and performance, so it should be fixed early in the design.
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. {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.
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 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.
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.
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.
If you are planning a new water and wastewater treatment project, send us your drawing, annual volume and target properties, and we will come back with a material proposal, a tooling plan and a budget quotation.
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