You ask three Chinese suppliers whether they can make a modified plastic housing. One says yes. Another asks for at least 1,000 units. The third says its existing model cannot be changed. These are illustrative replies, not actual ICW supplier quotations.
One factory may already have the mould and material. A second may need to purchase a minimum resin batch. A third may only quote its existing housing. The three replies describe different offers.
The useful comparison is each supplier’s proposed product version, process, quantity and price. Those details show whether any answer suits the first order.
The same request can require different production changes
A product that looks identical in a catalogue may be built through different production routes.
One company might mould a plastic housing and assemble the appliance in-house. Another might buy the housing from a specialist and perform final assembly. A third might use an existing mould that cannot accommodate the buyer’s requested change without new tooling.
That is why “Can you change this part?” can receive several legitimate answers. The buyer needs to know whether each supplier is discussing the same product version and which manufacturing steps it controls.
It also matters how the requirement was written. Consider “Can you make the housing waterproof?” One salesperson may interpret that as resistance to splashes. Another may understand a particular tested ingress-protection requirement. A third may think the buyer wants a sealed enclosure with a different design.
“Waterproof” is not a complete acceptance criterion: the intended exposure, enclosure design and any claimed ingress-protection rating matter. IEC 60529 defines IP-code classification for electrical enclosures, but an IP claim needs to be assessed for the specified product and use, not inferred from a salesperson’s description. The same ambiguity affects “premium material,” “quiet motor” and “heavy-duty construction.”
Existing tooling changes the answer
Suppose a buyer wants a housing dimension changed.
Supplier A has suitable equipment and access to the mould. It may quote a tooling modification and a new sample.
Supplier B purchases the housing from an outside factory. Its answer depends on that partner’s minimum quantity, tooling rights and willingness to change the part.
Supplier C uses an off-the-shelf housing and cannot make the change economically for this order.
All three may be describing their actual arrangements rather than contradicting one universal manufacturing rule.
Components make the same difference. A factory may buy motors, PCBs, switches and other parts from upstream companies. A requested component may already be available to one supplier but require a special order or redesign for another.
Understanding what the supplier makes itself and what comes from upstream specialists helps explain why apparently similar factories have different options.
“Can make it” is not the same as “will take this order”
The buyer may ask whether a factory can produce 300 units in a custom colour.
Technically, a machine might be able to make that quantity. Commercially, the factory may not want to run a special resin batch, change the line setup or hold unused material for such a small order.
One supplier could already have the colour in stock and accept 300 pieces. Another might quote MOQ 800. A third might decline the order.
The difference can be technical feasibility, upstream purchasing conditions or sales policy. Confirm which explanation applies to the version and quantity you requested. Asking which constraint applies is more useful than treating yes and no as final judgments about competence.
For more on this distinction, see where a supplier’s MOQ comes from.
What the sales reply has actually confirmed
Export salespeople handle enquiries, but they do not necessarily know every technical or production constraint.
A salesperson may give an initial answer based on experience, then consult engineering, purchasing, production or an upstream partner. The next answer may be more specific—or different.
That does not automatically mean the supplier was dishonest. It means the first response was not a confirmed production answer.
The buyer can ask which points have been checked and which still depend on a sample, component availability or production planning. A slower, qualified answer may be more useful than an unsupported promise. Equally, a cautious “no” is not automatically more reliable; it may simply describe one supplier’s current setup.
A salesperson’s use of “standard in China” or “It’s a China rule” should also be understood in its specific technical or commercial context.
Worked example: recycled plastic for an appliance housing
A buyer asks three suppliers about a specified recycled-plastic grade and finish for an appliance housing. The following replies are hypothetical; suitability also depends on product safety, material properties, provenance and any market-specific restrictions. Recycled content alone does not establish fitness for an electrical housing.
| Supplier | Initial response | What sits behind it |
|---|---|---|
| A | “Yes.” | Already uses a potentially suitable material and process; grade and product requirements still need confirmation |
| B | “Possible, MOQ 2,000.” | Upstream supplier requires a minimum material batch |
| C | “We don't recommend it.” | Previous trials with its present process gave inconsistent surface finish |
The first answer sounds most encouraging, but the buyer still needs to establish whether Supplier A’s material and construction meet the actual product requirements.
Supplier B’s minimum may apply to material purchasing rather than finished-product assembly. Supplier C may have a valid concern about appearance or processing that a different grade or finish could address.
The disagreement reveals which assumptions require confirmation. None of the three responses alone proves a suitable mass-production result.
Put the proposed versions side by side
Before comparing the answers, give each supplier the same clear requirement and record:
- Specification: exact material, dimensions, performance and any market-specific needs.
- Quantity and versions: batch size, colour or model splits, and customisation requirements.
- Proposed process: how each supplier would make the change and which steps are outsourced.
- Tooling and inputs: existing moulds, components, alternative sources and any MOQ.
- Commercial conditions: setup charges, unit price, sample work and lead time.
- Confirmation status: what has been checked with production and what remains provisional.
A quotation can reveal differences that an informal “yes” hides. One supplier might quote its normal component, another a revised component, and a third a redesigned product. Those are not equivalent offers. The guide on why Chinese suppliers quote different prices explains the related cost issues.
Rather than telling Supplier B that Supplier A can do it, consider asking:
“For our requested specification and quantity, which part of the process makes this difficult? Would the answer change with a different component, tooling arrangement or order size?”
The supplier can then describe its own production conditions instead of defending itself against an unrelated comparison.
What a factory visit can add
If the order warrants a visit, the buyer can compare explanations with observable activity: equipment, tooling, materials, work in progress, assembly, testing and packaging.
A visible process can support a supplier’s account of what it does in-house. It does not prove that the exact requested change will work in volume, nor does outsourcing automatically make a proposal less suitable.
The visit should help resolve a concrete question. For example, if the proposed change requires mould modification, the buyer can ask who controls the mould and who would carry out the work.
Which version can be ordered?
The three replies can be compared once the suppliers identify the same product requirements, the changes they propose and the quantities they will accept.
They may reflect different designs, suppliers, tooling, quantities, production methods or risk judgments. What matters is whether the buyer has given each supplier the same problem to solve—and whether each reply identifies the conditions behind its proposed answer.
A production route that works at 1,000 units may still be unsuitable for a 300-unit market test. Request the quoted version, quantity, tooling and sample conditions before shortlisting.