If you specify High Density Polyethylene (HDPE) plastic water treatment media and components, a handful of properties decide whether the part survives in service. These are the values worth checking on every data sheet.
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 water treatment media and components 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 tank liners and covers; MBBR media 10 mm to 25 mm; pipework DN15 to DN400. Materials most often specified are Polypropylene, Polyvinyl Chloride, High Density Polyethylene, Polyvinylidene Fluoride, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.
In the textile and garment sector the decision is usually driven by flexibility and abrasion resistance, with colour fastness as a secondary requirement. Typical end uses include zipper components, elastic tapes, hangers.
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 |
|---|---|---|---|
| Polyvinyl Chloride | 1.38-1.45 g/cm³ | 40-55 MPa | -10°C to 60°C |
| Polypropylene | 0.90-0.91 g/cm³ | 25-40 MPa | -10°C to 100°C |
| High Density Polyethylene | 0.94-0.97 g/cm³ | 20-32 MPa | -50°C to 80°C |
High Density Polyethylene is frequently the default selection here: HDPE combines toughness with chemical inertness, which is why it dominates pipe and tank markets.
Typical values for a general purpose grade are listed below; filled, stabilised and speciality compounds will differ.
Density 0.94-0.97 g/cm³, tensile strength 20-32 MPa, continuous service temperature -50°C to 80°C and melt range 130-137°C are the four values to circle on the data sheet. Everything else is secondary for most textile and garment 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.
Use this checklist when comparing two or three supplier quotations.
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.
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.
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.
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.
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.
If you are planning a new textile and garment 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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