Suitable for water-resistant parts, chemical-resistant parts, low-friction sliding parts, lightweight plastic structural parts, backing plates, partitions, water treatment parts, and general CNC plastic functional parts, as a general engineering plastic material for manufacturing.
High-Density Polyethylene (HDPE) is a high-density polyethylene plastic part material produced by CNC machining, featuring light weight, good water resistance, good chemical resistance, good toughness, good impact resistance, low coefficient of friction, and relatively controllable cost. It is commonly used in water-resistant parts, acid- and alkali-resistant parts, guide parts, backing plates, partitions, non-critical structural parts of food equipment, water treatment equipment parts, chemical equipment components, and low- to medium-strength plastic functional parts. Compared to Polypropylene (PP), HDPE usually have better impact and wear resistance; Compared to Acetal (POM), HDPE has weaker rigidity and dimensional stability, but better chemical and water resistance.
By focusing on application scenarios, boundaries of advantages, and non-recommended scenarios, it helps sales, customer service, and quoting staff quickly determine whether the material meets current part requirements.
Lightweight, good water resistance, good acid and alkali resistance, good chemical resistance, good toughness, good impact resistance, low coefficient of friction, good insulation, relatively controllable cost, suitable for CNC machining, and suitable for moisture and water treatment related parts.
Water treatment equipment parts, chemical equipment parts, acid- and alkali-resistant gaskets, guide plates, sliders, pads, partitions, baffles, non-critical structural parts of food equipment, conveying equipment parts, packaging equipment parts, ordinary fixtures and jigs, lightweight plastic brackets, low-friction sliding parts, water-resistant plastic parts, laboratory equipment parts.
High-strength load-bearing parts, high-rigidity structural parts, high-precision long-term dimensional stabilization parts, high-temperature usage parts, high-strength threaded parts, high-gloss appearance parts, transparent parts, precision gears, high-frequency high-precision moving parts, long-term outdoor exposure parts, appearance prototypes with high surface texture requirements, strong solvent or special chemical media environment parts.
The following parameters come from product information and material knowledge fields, used for design review, quotation communication, and preliminary judgment before material selection.
| Material positioning | Suitable for water-resistant parts, chemical-resistant parts, low-friction sliding parts, lightweight plastic structural parts, backing plates, partitions, water treatment parts, and general CNC plastic functional parts, as a general engineering plastic material for manufacturing. |
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| Precision performance | CNC HDPE can achieve the machining precision of ordinary plastic parts, but because the material is softer, less rigid, and exhibits more significant thermal expansion, its accuracy stability is usually not as stable as Acetal (POM), ABS, Polycarbonate (PC), and nylon. Actual accuracy is affected by part size, wall thickness, clamping method, tool sharpness, machining heat, internal stress in the material, and ambient temperature. Thin-walled parts, large parts, long strip parts, and large flat parts are more prone to deformation or dimensional deviations. |
| Dimensional tolerances | The standard dimensional tolerances for CNC machining HDPE can be referenced ± 0.10mm to ±0.30mm, while ordinary plastic structural parts can be evaluated at ± 0.20mm to ±0.50mm. Large parts, thin-walled parts, elongated parts, and parts easily affected by clamping deformation may experience greater deviations. These values are standard reference ranges and do not guarantee absolute tolerances for all structures. Precision mating surfaces, sealing surfaces, and assembly holes should be separately confirmed for machining requirements. |
| Minimum Wall Thickness | The wall thickness of the standard CNC machined HDPE structure is recommended not to be less than 1.5mm. Small non-stressed areas can be appropriately thinned, but it is not recommended to use large areas with overly thin walls. Due to the low rigidity of HDPE, thin-walled structures are prone to deformation, warping, or bending after assembly. The force-bearing positions, threaded positions, sealing points, and assembly positions should be appropriately thickened. |
| Recommended wall thickness | For ordinary structural parts, 2.0mm-4.0mm is recommended; pads, partitions, sliding plates, guide plates, and low-strength support parts are recommended to be above 2.5mm; for positions requiring screw fixing, sealing and pressing, welding, or bearing liquid pressure, it is recommended to be above 3.0mm. Rigidity should be improved through reinforcing ribs, fillet corners, support structures, and reasonable fixing methods. |
| Minimum aperture | CNC drilling can achieve smaller hole diameters, but HDPE small holes are prone to burrs, drawing, and hole deformation. For general designs, the recommended aperture is no less than 1.0mm-1.5mm. Deep holes, small holes, threaded holes, and sealed holes should be evaluated based on tool length, chip evacuation, material springback, and deburring requirements. Holes used for fluid channels should be carefully cleaned of burrs to avoid blockages, residues, or contamination of the medium. |
| Assembly clearance | For ordinary assembly, it is recommended to reserve 0.20mm-0.40mm on one side; for movable fitting, it is recommended to reserve 0.40mm-0.80mm on one side. Because HDPE material is relatively soft, has significant thermal expansion, and is prone to deformation, the assembly gap should not be too tight. Sliding parts, guide members, seals, and water treatment structures should be individually designed for clearance and compression according to temperature changes, pressure, friction, and material deformation. |
| Detailed performance | CNC HDPE is suitable for machining holes, grooves, steps, chamfers, fillets, partitions, baffles, sliding surfaces, and ordinary structural details. Because the material is relatively soft, small sharp corners, tiny text, thin edges, tiny grooves, and fine textures can easily cause burrs, brushing, or unclear edges. Logos and labels can be achieved through engraving, silkscreening, or labeling, but complex textures are not recommended on high-wear surfaces, sealing surfaces, or precision fit surfaces. |
| Surface effect | The raw machined surface of CNC HDPE is usually white, milky white, black, or natural plastic material, with slight knife marks visible on the surface. The texture is more functional and does not belong to high-end appearance materials. Processing edges may develop burrs, brushing, curled edges, or localized whitening. Chamfering, deburring, and light sanding make the edges look neater, but it is difficult to achieve the high appearance of ABS painted parts, Acrylic (PMMA) transparent parts, or metal parts. |
Based on material characteristics and suitable product ranges, customer needs are broken down into easier application directions to determine.
Water treatment equipment parts, chemical equipment parts, acid- and alkali-resistant gaskets, guide plates, sliders, pads, partitions, baffles, non-critical structural parts of food equipment, conveying equipment parts, packaging equipment parts, ordinary fixtures and jigs, lightweight plastic brackets, low-friction sliding parts, water-resistant plastic parts, laboratory equipment parts.
Suitable for water-resistant parts, chemical-resistant parts, low-friction sliding parts, lightweight plastic structural parts, backing plates, partitions, water treatment parts, and general CNC plastic functional parts, as a general engineering plastic material for manufacturing.
CNC High-Density Polyethylene (HDPE) has excellent water and chemical resistance, making it suitable for environments with humidity, water treatment, low friction, and light load wear. It has good toughness and impact resistance, is not prone to brittle cracking, and has a low coefficient of friction, making it suitable for use as guide plates, sliding plates, backing plates, and partitions. However, HDPE has lower rigidity, noticeable thermal expansion, is prone to deformation, and its dimensional stability and machining accuracy are generally inferior to materials like Acetal (POM), ABS, and Polycarbonate (PC).
Based on wall thickness, hole position, assembly clearance, dimensional tolerances, and material usage risks, determine in advance whether the part structure is suitable for High-Density Polyethylene (HDPE).
Post-processing of High-Density Polyethylene (HDPE) affects appearance, dimensions, hole position, assembly clearance, and usage validation results, and should be explained in advance during quotation, DFM review, and sample confirmation stages.
Post-processing should focus on appearance display, dimensional fitting, connection assembly, and testing verification. Parts involving assembly positions need to be reserved in advance for machining, coating, and trial assembly allowances.
For common issues such as threads, snaps, strength, temperature resistance, and weather resistance, identify in advance whether the material needs to be replaced or if another processing method should be used.
When customer demand exceeds High-Density Polyethylene (HDPE) material boundaries, it is necessary to combine strength, temperature resistance, toughness, long-term stability, and mass production goals to promptly recommend alternative materials or processing technologies.
If higher wear resistance and lower friction are required, ultra-high molecular weight polyethylene UHMW Polyethylene (PE) can be chosen; If better dimensional stability and rigidity are required, CNC Acetal (POM) can be chosen; If better appearance and structural verification are needed, CNC ABS can be chosen; If higher strength and temperature resistance are required, CNC Polycarbonate (PC), Nylon (PA)66, PPS, or Polyether Ether Ketone (PEEK) can be chosen; If stronger chemical resistance is required, Polypropylene (PP), PVDF, or PTFE can be chosen; If higher load capacity is required, aluminum alloy, stainless steel, or other metal materials can be chosen.
If customers mainly focus on water resistance, chemical resistance, lightweight, low friction, and low-cost plastic parts, CNC HDPE is the appropriate choice. If customers require high-precision assembly, higher rigidity, higher temperature resistance, or premium appearance, it is not recommended to prioritize HDPE; instead, Acetal (POM), ABS, Polycarbonate (PC), Nylon (PA), or metal materials can be considered. If the part is used in scenarios involving food, drinking water, medical, or special chemical media, it is necessary to separately confirm the material grade, certification, and media compatibility.
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