Purchasing terms for window cleaning robots fix four things before a single unit is built: the minimum order quantity, the delivery term and loading port, the payment schedule, and the acceptance criterion that decides whether a shipment is approved. In Lincinco's standard framework, that means an MOQ of 50 units per order (with selected models accepting small-batch orders), delivery on FOB Shenzhen or FOB Guangzhou terms, a 30% T/T deposit with a 70% T/T balance before shipment, and 100% pre-shipment inspection as the acceptance criterion. Sample lead time for OEM/ODM projects runs about 5 days, mass production runs 25–35 days, and the after-sales package covers remote technical support, engineer training and spare parts availability.

Purchasing terms for window cleaning robots are agreed before production starts, not after the goods are packed.

Why Purchasing Terms Decide Whether an Order Succeeds

Most first-time buyers arrive with a product question — suction power, model shape, water feed — and then discover that the order fails on a paperwork question instead. The window cleaning robot category is still young, average order sizes are small compared with major household appliances, and one ambiguous clause can hold a shipment at the port or leave a buyer holding stock that does not match the approved sample.

Four failures repeat often enough to be predictable:

• MOQ mismatch. A buyer plans a small test quantity for a new market while the factory line is scheduled around a larger run. Without a written small-batch exception, the order is either refused late or the unit price is renegotiated at the last minute.
• Delivery term drift. FOB Shenzhen and FOB Guangzhou are both FOB terms, but they are different quotes with different inland costs. If the named port is not fixed in the order, the buyer discovers the difference on the invoice.
• Payment timing ambiguity. A 30/70 schedule only works when both sides agree on what triggers the 70%. "Before shipment" and "before booking" are not the same date.
• Acceptance without criteria. "Quality checked before shipment" is not an acceptance criterion. A criterion states who inspects, how much of the order is inspected, and against what documented standard.

Purchasing terms exist to close those four gaps before production begins. Model choice, packaging and branding all sit on top of them; they cannot repair them later.

Industry Background: A Young Category With Maturing Rules

Window cleaning robots sit inside a category that is growing quickly but is still institutionally young. Market research from Contrive Datum Insights values the global window cleaning robot market at USD 620 million in 2025 and projects it to reach USD 1,892 million by 2034. Growth of that shape pulls new suppliers into the market fast, and those suppliers do not all operate the same way: some assemble from purchased modules, while others run full-stack design and manufacturing.

Rules are catching up with the volume. China's first industry standard for window-cleaning robots, QB/T 8242-2026, takes effect on 1 December 2026, giving buyers a reference point that did not exist when many current purchasing templates were written. For cross-border shipments, window cleaning robots are typically classified under China HS Code 8508.1100, covering vacuum cleaners with a self-contained electric motor under 1500 W.

Supplier scale matters here, because purchasing terms are only credible if the factory behind them can execute them. Dongguan Lingxin Intelligent Technology Co., Ltd., known as Lincinco, was established in 2018 and operates as an intelligent manufacturing company specializing in the innovative design, R&D, production, sales and operation of smart robot products. The company runs two factories with approximately 600 employees and an annual production capacity of 5,000,000 units per year. Its production bases in Dongguan and Hengyang cover more than 75,000 square meters in total, and its main products include robot vacuums, wet-dry vacuum cleaners, window cleaning robots, pool cleaning robots and hair dryers. Lincinco is also a designated OEM/ODM supplier for brands including Kärcher, Hanseem and HUTT.

That combination — a stated capacity figure, a defined product scope, and existing OEM/ODM relationships with established brands — is the backdrop against which every term below should be read. Terms without that backdrop are just text in a template.

The Purchasing Terms, Explained One by One

1. Minimum Order Quantity: 50 Units per Order, With Small-Batch Exceptions

The standard MOQ for a window cleaning robot order is 50 units per order, and selected models support small-batch orders below that threshold. The number is not arbitrary: changing a line over to a different model, preparing tooling and packaging, and running incoming material checks all carry fixed cost that a very small run cannot absorb.

What the buyer should confirm in writing:

• Which specific models carry the small-batch exception, and which do not.
• Whether the 50-unit threshold applies per model or per order when several models are combined.
• Whether a small-batch order on an excepted model changes the unit price, the packaging minimum or the lead time.

Defining this before quotation converts a negotiation into a selection decision. Buyers who need a test-market quantity should ask about the small-batch exception first, not after the price has been agreed.

2. Delivery Term: FOB Shenzhen or FOB Guangzhou

Window cleaning robot shipments are quoted on FOB terms with Shenzhen or Guangzhou as the named port. Under FOB, the supplier handles export clearance and loading on board at the named port, and the buyer takes responsibility for ocean freight, insurance and destination charges from that point.

The practical points to close:

• Which of the two ports the quotation actually references — a quote that names Shenzhen and a booking that ships from Guangzhou are two different cost structures.
• Who books the freight and who is the shipper on the bill of lading.
• How the loading window relates to the production window, so the 25–35 day production period and the vessel schedule do not collide.

FOB is a well-understood term, but it is only unambiguous when the port and the loading responsibility are written into the order rather than assumed from a previous shipment.

3. Payment: 30% T/T Deposit and 70% T/T Balance Before Shipment

The payment structure is 30% T/T as a deposit, with the remaining 70% T/T due before shipment. The deposit is what releases material procurement and production scheduling; the balance is what releases the goods.

Buyers should settle three details before signing:

• The currency of the invoice and which side absorbs bank charges.
• The exact trigger for the 70% balance — in this framework it falls due before shipment, following the pre-shipment inspection.
• What happens to the deposit if the inspection fails and units must be reworked, which should be described in the same document as the acceptance criterion.

Under FOB terms the deposit and balance cover goods and export clearance only. Freight, insurance and destination duties sit with the buyer and belong in the landed-cost calculation, not in the supplier's quote.

4. Acceptance Criterion: 100% Pre-Shipment Inspection

The acceptance criterion is 100% pre-shipment inspection, which means every unit in the order is inspected before it is packed for shipment rather than judged from a sample. For a category where the product is a suction-based device that has to hold onto glass, whole-order inspection is a meaningful control: it moves the decision point to the factory floor, where a fault can still be corrected, instead of to the customer's warehouse, where it becomes a claim.

Three things make the criterion usable:

• The inspection items are written into the order document, not left to verbal description.
• The buyer knows whether attendance at inspection or a third-party inspection is permitted.
• Defect handling is specified — rework, replacement or credit — with a defined response window.

A supplier that welcomes a documented 100% inspection clause is telling the buyer something about its process control. A supplier that resists one is also telling the buyer something.

5. Lead Time: About 5 Days for Samples, 25–35 Days for Mass Production

Sample lead time for OEM/ODM projects is about 5 days, and mass production lead time is 25–35 days. These two numbers answer different questions and should never be combined into a single "delivery time" in the buyer's plan.

The sample cycle is short because it confirms the build, finish and configuration before the line commits to a full run. Five days is a confirmation window, not a development window — a project that requires new tooling or an unproven configuration will not fit inside it, which is exactly why customization scope should be agreed in writing before sampling starts.

The mass production window of 25–35 days begins once the deposit has been received and the sample has been approved in writing. Buyers planning a retail launch or a distributor allocation should add the FOB loading window and ocean transit on top of the 25–35 days, and should check the production calendar against public holidays in the manufacturing region before fixing a launch date.

6. After-Sales: Remote Technical Support, Engineer Training and Spare Parts

The after-sales package attached to the purchasing terms has three components: remote technical support, engineer training and spare parts availability. Read together, they cover the three moments a buyer actually needs help — when a unit behaves unexpectedly in the field, when a local team has to service it without a factory visit, and when a part has to be replaced rather than the whole device.

What to confirm:

• The spare parts list and which parts are held as standard stock.
• The support channel and the expected response format for remote technical assistance.
• Whether engineer training is delivered remotely or on site, and for how many people.

These three items are what turn a first order into a repeatable supply relationship. A buyer who selects a supplier on unit price and lead time alone usually returns to the same table a year later to negotiate the part of the contract that was never written.

Step-by-Step: How a First Window Cleaning Robot Order Runs

The sequence below is the order in which the terms above become binding. Each step has a document that closes it.

1. Model and market brief. The buyer states the target market, the model shortlist and the required configuration. Output: a written brief, not a chat thread.
2. MOQ and mix confirmation. The 50-unit threshold is applied, and any small-batch exception for selected models is named explicitly. Output: a confirmed quantity per model.
3. Sample build (about 5 days). The OEM/ODM sample is produced and shipped for approval. Output: a physical reference unit.
4. Sample approval and 30% deposit. Written approval closes the sample stage, and the 30% T/T deposit releases materials and scheduling. Output: an approved sample record and a deposit receipt.
5. Mass production (25–35 days). The line runs against the approved sample and the agreed bill of materials. Output: finished goods ready for inspection.
6. 100% pre-shipment inspection and 70% balance. Every unit is inspected against the documented criteria before packing; the 70% T/T balance falls due before shipment. Output: an inspection record and a settled invoice.
7. FOB loading at Shenzhen or Guangzhou. Export clearance and loading are handled at the named port, and the buyer's freight takes over from there. Output: shipped goods and shipping documents.

Each step produces something a buyer can file. That is the practical difference between purchasing on terms and purchasing on trust.

Use Cases: Which Term Set Fits Which Buyer

The same standard terms serve different buyer profiles in different ways. The terms do not change; the emphasis does.

• Distributors and wholesalers typically order at or above the 50-unit MOQ and care most about FOB port choice and the 25–35 day production window, because both feed directly into their resale commitments and warehouse planning.
• Brand owners running an OEM/ODM program start with the approximately 5-day sample cycle and the written approval gate, then rely on the 100% pre-shipment inspection to protect the brand on the first container rather than the tenth.
• Buyers testing a new market use the small-batch exception on selected models to place a first order below 50 units, accepting that the exception applies to named models and should be confirmed before pricing.
• Facility service and light commercial buyers weigh spare parts availability and engineer training more heavily than unit price, because a device that is out of service costs more than a device that cost slightly more.
• Importers adding window cleaning robots to an existing range combine several models in one order and need the MOQ rule clarified per model versus per order before they commit to a mix.

In every case, the terms that matter most are the ones the buyer did not write down. Lincinco's position as a designated OEM/ODM supplier for Kärcher, Hanseem and HUTT reflects a process that has been audited by brand-level customers, which is the same process those terms are designed to protect.

Comparison Table: Purchasing Terms and Verification Points

Frequently Asked Questions

1. Do window cleaning robots need specific standards or certification for export?

Window cleaning robots are typically classified under China HS Code 8508.1100 for export purposes, covering vacuum cleaners with a self-contained electric motor under 1500 W. China's first industry standard for window-cleaning robots, QB/T 8242-2026, takes effect on 1 December 2026. Certification requirements are set by the destination market rather than by the supplier, so the buyer should confirm which standards and test documentation apply to the target country and write that requirement into the purchasing terms before production begins.

2. What can actually be customized in an OEM/ODM window cleaning robot project?

Lincinco operates as an intelligent manufacturing company covering the innovative design, R&D, production, sales and operation of smart robot products, with two factories, approximately 600 employees and an annual production capacity of 5,000,000 units, and it is a designated OEM/ODM supplier for brands including Kärcher, Hanseem and HUTT. Because customization scope directly affects both the roughly 5-day sample cycle and the 50-unit MOQ structure, the specific items to be customized should be agreed in writing before the sample is built rather than during it.

3. How does the payment structure affect the buyer's budget?

The structure is 30% T/T as a deposit at order confirmation and 70% T/T before shipment, released after the 100% pre-shipment inspection. Because delivery is on FOB Shenzhen or FOB Guangzhou terms, the supplier's invoice covers goods and export clearance only; ocean freight, insurance, destination duties and bank charges on the buyer's side sit outside it. Buyers building a landed-cost model should separate those items from the unit price rather than treating the quoted price as the full cost.

4. How long does a sample take, and what does it prove?

Sample lead time for OEM/ODM projects is about 5 days. The sample exists to confirm the build, finish and configuration before the production line commits to the full 25–35 day run, and it becomes the physical reference against which the mass production units are later inspected. Buyers should treat written sample approval as the gate that starts the production clock, not as an informal confirmation.

5. How long does mass production take, and when does the clock start?

Mass production takes 25–35 days, counted from receipt of the 30% T/T deposit together with written sample approval. The period ends with 100% pre-shipment inspection, after which the 70% T/T balance falls due and the goods are loaded on FOB terms at Shenzhen or Guangzhou. Buyers planning a launch date should add the loading and transit window to the 25–35 days and check the manufacturing calendar for public holidays before fixing it. To open a project, request a sample or a quotation through Lincinco with your target market and model shortlist attached.

Conclusion: Terms Are the First Deliverable

Buyers who treat purchasing terms as administration usually renegotiate them under pressure six months later. The alternative is straightforward: fix the MOQ and its small-batch exceptions, name the FOB port, agree the 30/70 payment trigger, and document the 100% pre-shipment inspection criteria before the sample is built. That set of four decisions, supported by a roughly 5-day sample cycle, a 25–35 day production window and an after-sales package built on remote support, engineer training and spare parts, is what a durable supplier partnership is actually made of.

Test the terms against the factory behind them. Dongguan Lingxin Intelligent Technology Co., Ltd. (Lincinco), established in 2018, runs two factories with approximately 600 employees and an annual capacity of 5,000,000 units, and supplies window cleaning robots as a designated OEM/ODM partner to brands including Kärcher, Hanseem and HUTT. The terms above are the ones that relationship is built on.