For a cut blank or finished HDPE or PP part, send us the current drawing, material requirement and quantity. Distinguish finished dimensions from the starting sheet and mark the features that control fit, sealing or alignment.
We supply full sheets, cut blanks and drawing-based plastic parts. Send the information below so we can review cutting, CNC machining and any requested joining work, then confirm the material and supply scope in our quotation.
Compare HDPE and PP-H for the service conditions
| Selection factor | HDPE | PP-H |
|---|---|---|
| Mechanical and thermal behavior | Check impact resistance and flexibility for the offered HDPE grade | Compare stiffness, impact resistance and temperature limits for the offered PP-H grade |
| Wet or outdoor components | Often considered; specify a suitable UV-stabilized grade outdoors | Possible when grade and exposure are suitable |
| Chemical equipment | Check compatibility with the actual medium and service conditions | Frequently evaluated for tanks, hoods, ducts and chemical components |
| Dimensional behavior | Thermal expansion, creep and flexibility must be allowed for | Allow for creep and thermal movement under the specified temperature and loads |
| Fabrication | Cutting, machining and thermoplastic welding, subject to grade and process review | Cutting, machining, thermoforming and thermoplastic welding, subject to grade and process review |
| Approval basis | Exact grade, medium, concentration, temperature, load, contact duration and required evidence | |
Use the table to compare candidate grades, not to approve a finished assembly. Our HDPE and PP chemical-equipment comparison lists the media, cleaning cycles and loads to define for tanks and water-treatment parts.
Fabrication routes we can review
| Supply route | Suitable request | Information needed |
|---|---|---|
| Full sheet | Buyer performs all processing | Grade, thickness, sheet size, color, surface and quantity |
| Cut-to-size blank | Rectangles or simple profiles that reduce local cutting | Finished dimensions, cutting tolerance, edge condition and labeling |
| CNC-machined part | Holes, pockets, slots, contours, grooves and milled edge profiles | PDF/CAD drawing, datums, tolerances, surface and inspection points |
| Welded component | Tray, duct, cover or other fabricated assembly | Sheet grade, joint design, compatible welding material where used, medium, temperature, loads and acceptance checks |
| Labeled kit | Multiple parts supplied for an assembly or installation | Part numbers, revision, quantity per set, labels and packing sequence |
We confirm the available process, finished dimensions, tolerances, inspection, packing and commercial terms in the quotation. If a feature or joining requirement needs clarification, we resolve it with you before confirming the order.
Design-for-manufacturing checks
Finished thickness and machining allowance
Show the remaining finished thickness below pockets, grooves, counterbores and countersinks. Heavy or one-sided stock removal can release stresses and affect flatness. We review the starting blank, machining sequence and achievable flatness against the drawing; any proposed change needs your approval.
Tolerances based on function
Define tolerances from the part's function and identify the datums used to measure them. Agree the measurement temperature, part support and inspection method for critical features. Dimensions checked during inspection do not, by themselves, establish fit across every service temperature or under sustained load.
Corners, holes and fasteners
Specify internal radii that can be machined with the selected tooling, hole types, countersink or counterbore details and edge distances. For fastening, show the bearing areas and any clearance or sliding points needed for thermal movement. These details must suit the material grade and loading.
Welded assemblies
Mark the weld locations, sheet grade, joint geometry, medium, temperatures and loads. Specify compatible welding material where used, preparation, process controls and acceptance checks. For a load-bearing tank or safety-critical assembly, the responsible designer must assess the complete design and validation requirements; our fabrication quotation does not replace that assessment.
Drawing package for an accurate quote
- PDF drawing for readable dimensions and notes
- CAD file for profiles or 3D geometry, with the controlling drawing identified
- Drawing number and revision
- Material grade, color and surface requirement
- Finished dimensions, datums and tolerances
- Quantity per part and expected repeat demand
- Part function, loads, temperatures, contact media and outdoor exposure
- Required inspection records, material or compliance evidence and part labels
- Destination, packing limits and required arrival date
A photo or sample can explain appearance or assembly, but agree dimensioned requirements for repeatable parts. Identify which drawing or model controls the order if files differ. Tell us about confidentiality requirements before sending sensitive files so the handling arrangements can be agreed.
From quotation to production
- RFQ review: we check the files, revision, material, quantity and service conditions.
- Manufacturability check: we review unclear dimensions, critical tolerances, thin sections and packing risks.
- Quotation: we identify the offered material, supply scope, quantity, tolerances, inspection, packing, price and lead time, including any exclusions or proposed deviations.
- Technical confirmation: we agree the open points with you and record the accepted drawing revision and any approved deviations in the order.
- First article when required: agree the sample quantity, features to check, required records and who may authorize production.
- Production and inspection: measure the specified critical features and maintain part identification.
- Packing and shipment: protect surfaces and edges and label parts to match the packing list.
Inspection and repeat-order control
Agree the inspection scope before ordering: material identification, overall dimensions, datums, hole positions, machined depths, surface, quantity and labels as applicable. State the sampling quantity, measurement method and conditions, acceptance limits and records required. A material data sheet is not a report of measurements on your finished parts.
For a repeat order, confirm the applicable drawing revision rather than assuming the previous one still applies. Record changes to the grade or source, geometry, process, tolerances and approved deviations. Where batch traceability is required, agree how the part or order reference will connect labels and inspection records.
RFQ table for custom plastic parts
| Part identity | Part name/number, drawing number and revision |
|---|---|
| Material | HDPE or PP grade, color, surface and required documents |
| Geometry | Finished dimensions, thickness, holes, slots, grooves and radii |
| Tolerance | Critical dimensions, datums, flatness, measurement method, temperature and part support |
| Service | Load, temperature, chemicals, wear and indoor/outdoor use |
| Quantity | Sample or first-article quantity, production order and estimated repeat demand |
| Quality | Agreed inspection checks, acceptance records, labels and any required traceability |
| Delivery | Destination, agreed delivery terms, packing limits and required arrival date |
We supply industrial HDPE sheets and PP-H sheets, with cutting and machining scope confirmed against your drawing. Our custom plastic sheet purchasing guide covers the broader material, documents, packing and delivery request.
Frequently asked questions
Can you quote from a 3D file only?
Send the 3D model together with a dimensioned PDF identifying the material grade, drawing revision, tolerances, finish and quantity. Tell us which file controls if the model and drawing differ. We can then review the geometry against the quotation and inspection requirements.
Should we order a first article?
Consider one for a new part with critical fits, several operations or repeat production. Agree the sample quantity, measured features, records and approval authority during quotation. Approval covers the agreed checks; it is not a blanket certification of every service condition.
Can HDPE and PP parts be packed as one kit?
We can review kit packing from the bill of materials and quantity per set. Part dimensions, labels, surface protection, packing sequence and receiving constraints determine the proposed arrangement, which we confirm before the order.
Request a fabrication quotation: Send your current drawing, material requirement, quantity, inspection needs and destination with a custom HDPE or PP part enquiry.
