By Senjie Filter Press Engineering Team · Last updated: 2026-09-14
Quick answer: Vet a Chinese filter press manufacturer on 10 points: confirmed factory status, in-house or named plate source, hydraulic brand, cloth supply, sizing drawings, a test-run video, 12-month warranty, spare parts stock, 25 to 45 day lead time and 30/70 T/T or L/C terms. Any supplier that fails 3 or more points is a trading risk.
China supplies most of the chamber and membrane filter presses sold to mining, tailings and wastewater projects in Southeast Asia, India, Africa, the Middle East and Latin America. The hard part is separating a factory that moulds its own plates and welds its own frames from a trading office or marketplace listing that resells someone else’s press. This checklist gives you 10 verifiable questions, the red flags, and a table comparing the three supplier types.
What are the 10 points to check before ordering a filter press from China?
The 10 points are: factory status, plate source, hydraulic components, cloth supply, drawings and sizing support, test-run video, warranty, spare parts stock, lead time and payment terms. Each can be verified with a document, a video or a technical question without visiting the factory.
- Factory or trader. Ask for the business licence and check that the scope includes manufacturing, not only sales or import and export. Request a live video call from the workshop floor.
- Plate source. Ask whether PP and membrane plates are moulded in-house or bought from a named plate factory, and ask for plate thickness (25 to 40 mm) and temperature rating (90 °C for PP, 120 °C for glass-reinforced PP).
- Hydraulic brand. The hydraulic station closes the plate pack at 20 to 25 MPa. Ask which brands are used for the pump, valves and seals. A supplier who cannot name them has not built the press.
- Cloth supply. Cloth lasts 3 to 12 months. Confirm the supplier can ship replacement filter press cloth in PP, PA, PET or monofilament cut to your plate size, and ask for the micron rating and air permeability of the cloth quoted.
- Drawings and sizing support. Expect a general arrangement drawing, foundation loads and a sizing sheet based on your dry solids per day, slurry density and target cake moisture.
- Test-run video. Before shipment the press should be closed hydraulically, held at pressure for 30 minutes and cycled. Ask for a dated video with your order number visible.
- Warranty. 12 months on the frame, hydraulics and controls is the norm. Check what is excluded and how replacement parts are shipped.
- Spare parts stock. Ask for a two-year spares list: plates, cloth, seals, hydraulic solenoids, PLC modules. A factory keeps these in stock.
- Lead time. 25 to 45 days for standard chamber and membrane presses. Longer than 60 days for a standard unit usually means the supplier is subcontracting.
- Payment terms. 30% deposit and 70% before shipment by T/T, or L/C at sight for larger orders. Refuse 100% advance.
How do I confirm a supplier is a factory and not a trading company?
Three checks confirm factory status in under a week: a live workshop video call, a business licence with a manufacturing scope, and a photo of a press under assembly carrying your quotation number. Trading companies usually operate from an office building, cannot show frames in progress, and quote a wide product range that no single factory would make.
Ask technical questions that need workshop knowledge, such as the chamber depth moulded for a 1250 mm membrane plate (typically 25 to 32 mm) or the closing force of the 1500 mm hydraulic cylinder. A factory engineer answers in minutes. A trader forwards the question and replies a day later.
Factory vs trading company vs marketplace listing: what is the difference?
A factory controls plate quality, lead time and spare parts. A trading company adds 8 to 20% margin and a communication layer, but can be useful for mixed equipment from several makers. A marketplace listing is often a trader using stock photos, with the lowest quoted price and the least accountability.
| Checklist point | Factory | Trading company | Marketplace listing |
|---|---|---|---|
| Business licence scope | Manufacturing | Sales / import-export | Often not shown |
| Plate source | In-house or named partner | Unknown or varies by order | Usually unknown |
| Hydraulic brand named | Yes, with options | Sometimes | Rarely |
| Sizing drawings | GA drawing plus sizing sheet | Forwarded from factory | Catalogue table only |
| Test-run video | Standard before shipment | On request | Rarely offered |
| Spare parts | Stocked, 3 to 7 days dispatch | Ordered per request, 2 to 4 weeks | Uncertain |
| Typical lead time | 25 to 45 days | 35 to 60 days | Quoted short, often slips |
| Price versus factory | Base | +8 to 20% | -5 to +15%, inconsistent |
| Warranty support | Direct engineer contact | Via intermediary | Platform dispute only |
What sizing information should the manufacturer ask me for?
A competent manufacturer asks for at least six data points before quoting: dry solids per day (t/day), slurry solids concentration (%), particle size or d50, feed temperature, target cake moisture and operating hours per day. From these, the sizing sheet calculates filter area, plate size and plate count. Our guide on how to calculate filter press capacity shows the method.
For mining tailings and concentrate, the manufacturer should also ask about abrasiveness and pH, which decide cloth material and plate grade. For wastewater sludge, they should ask about flocculant type and dose, because poorly flocculated sludge needs 20 to 40% more filter area. A plate count quoted within an hour without these questions is a guess.
What are the red flags when buying a filter press from China?
The five most common red flags are: a request for 100% payment in advance, refusal to do a live workshop video, stock photos with logos blurred out, a lead time under 15 days for a large press, and a price more than 25% below other quotations. Two or more justify walking away.
- No hydraulic pressure stated. If the quotation lists plate size and count but no closing pressure (should be 20 to 25 MPa) or feed pressure (0.6 to 1.0 MPa chamber, up to 1.6 MPa high pressure), the supplier is copying a catalogue.
- Membrane press quoted at chamber press price. Membrane plates and the squeeze water or air system add 25 to 45% to the price. A membrane press quoted at the same price as a chamber press of the same size is probably not a membrane press.
- Vague plate material. “Plastic plates” or “engineering plastic” is not a specification. Ask for polypropylene, glass-reinforced polypropylene or TPE membrane, and the thickness.
- No drawings before deposit. A general arrangement drawing with overall dimensions and foundation loads should be available before you pay.
- Different company name on the invoice. Check that the beneficiary bank account name matches the company on the contract.
How does Senjie handle each checklist point?
Senjie is a China-based manufacturer of chamber, membrane, plate-and-frame and fully automatic filter presses, founded in 2014 in Changzhou, Jiangsu, and exporting to 40+ countries across Southeast Asia, India, Africa, the Middle East and Latin America. The factory moulds PP, glass-reinforced PP and membrane filter plates in standard sizes from 320 to 2000 mm and supplies matching cloth, feed pumps and spare parts from the same site.
On the checklist points: workshop video calls are arranged on request; hydraulic and PLC component brands are listed on the quotation; every press is closed and held at working pressure before shipment and the test is recorded; the standard warranty is 12 months on frame, hydraulics and controls; lead time for standard chamber filter presses and membrane filter presses is 25 to 45 days; and payment is normally 30% T/T deposit with the balance before shipment, or L/C at sight. Indicative FOB China price ranges by plate size are published in our filter press price by plate size guide — indicative — request a quotation for a sized offer.
Frequently Asked Questions
How can I tell if a Chinese filter press supplier is a real factory?
Ask for a live video call from the workshop showing the plate moulding or frame welding area, the business licence with a manufacturing scope, and photos of a press with your order number on it during assembly. A trader usually cannot arrange a live workshop walk-through on short notice or will show a partner’s factory under a different company name.
What is a normal lead time for a filter press from China?
25 to 45 days after the deposit for standard chamber and membrane presses with 630 to 1500 mm plates. Fully automatic presses with PLC, plate shifters and cloth washing usually take 40 to 60 days. Add 25 to 45 days of sea freight depending on the destination port.
What payment terms are typical for a filter press order?
30% deposit by T/T with the balance before shipment is the most common structure. Irrevocable L/C at sight is normally accepted for orders above roughly USD 50,000. A 100% advance request from a supplier you have not visited or video-verified is a red flag.
What warranty should I expect on a filter press?
12 months on the frame, hydraulic system and electrical controls from the date of shipment is the usual standard. Filter cloth is a consumable and is normally excluded. Filter plates are usually covered for manufacturing defects but not for damage from over-pressure or uneven feeding.
Send your dry solids per day, slurry concentration and target cake moisture through the Senjie contact page and our engineering team will return a sizing sheet, general arrangement drawing and quotation.