Practical Answer — Supplier Control
What to Disclose to a Chinese Supplier in Phase 1, Phase 2, and Phase 3
Last updated: June 2026
You do not need to send everything in the first supplier email. What you share should match the current stage of the relationship and the level of IP protection and agreement structure you have in place.
In short
Phase 1 — initial screening — requires only product category, approximate function, and certifications. Phase 2 — sampling — requires controlled drawings and specifications, shared under a signed NNN. Phase 3 — tooling and production — requires full CAD, BOM, and manufacturing files, shared under a manufacturing agreement with ownership and exit terms.
Why Phased Disclosure Matters
Every supplier engagement involves disclosure — sharing some information about what you need in exchange for the supplier's assessment of whether they can provide it. The question is not whether to disclose, but what to disclose at each stage.
The reason phased disclosure matters is simple: once information is shared, it cannot be recalled. A supplier who receives full CAD files in the first email has your complete product design — regardless of whether the NNN is later signed or the relationship proceeds. Phased disclosure ensures that more sensitive information is shared only when the appropriate control structure is in place.
The most common mistake is compressing all three phases into one: sending the full product details to get a quote, before the NNN is signed, before the supplier is verified, and before any tooling or manufacturing terms are established.
Phase 1 — Initial Supplier Screening
What this phase is for: assessing supplier capability and fit — not disclosing the design
Share in Phase 1
- General product category and function
- Approximate product dimensions and form factor
- Key materials (plastic, metal, electronics, etc.)
- Target certifications (FCC, CE, RoHS, etc.)
- Approximate production volume and timeline
- Manufacturing type required (injection molding, CNC, SMT, etc.)
Hold back in Phase 1
- CAD files, STP / STEP files, or detailed drawings
- Bill of materials (BOM)
- PCB layout or electronics schematic
- Firmware notes or software architecture
- Brand name or product name
- Pricing expectations or margins
- Downstream customer or market information
Phase 2 — Technical Discussion and Sampling
Prerequisite: NNN signed by the verified factory entity
Phase 2 covers the period when you are confirming the supplier can make your product and getting samples produced. More technical detail is necessary — but only after the NNN is signed by the correct factory legal entity (not just an agent or trading company).
Share in Phase 2
- Controlled drawings sufficient for sampling (not full production drawings)
- Sample requirements and reference photos
- Key specifications for the sample objective
- Selected component references (where necessary for sampling)
- Basic assembly or function description
Still hold back in Phase 2
- Full production-grade CAD / STP / STEP files
- Complete BOM with all component references
- PCB Gerber files or schematic
- Firmware source code or binary
- Tooling drawings or production fixture specs
- Proprietary technology not needed for sampling
Phase 3 — Tooling and Production
Prerequisite: Manufacturing / OEM agreement with tooling ownership, file ownership, quality, and exit terms
Phase 3 is when full technical disclosure is appropriate — because the manufacturing agreement provides the ownership and control structure that protects what you are sharing.
Share in Phase 3
- Full CAD / STP / STEP production files
- Complete BOM with all component specifications
- PCB design and electronics production files
- Firmware build instructions
- Tooling drawings and production fixture specs
- Manufacturing specifications and tolerances
- Approved sample standards and inspection criteria
Controls to confirm before Phase 3
- Manufacturing / OEM agreement signed by factory entity
- Tooling ownership clause in agreement or PO
- Product file ownership and return clause
- Quality and inspection terms established
- Exit and mold-transfer terms in place
- IP filing restriction clause (no factory filing based on your design)
Practical Note on Sequencing
The phases above are a practical framework, not a rigid legal protocol. Real supplier conversations are messy and suppliers will often push for more information earlier. The key discipline is: do not share Phase 3 information before Phase 3 controls are in place, and do not share Phase 2 information before the NNN is signed.
See also: How Hardware Founders Should Sequence NNN, Sampling, and Tooling for the agreement sequence that maps to these disclosure phases, and What Should I Say Before Sending CAD Files to a Chinese Manufacturer? for the communication approach.
Need a controlled China supplier path before outreach?
ChinaIPGateway helps overseas hardware founders and product companies review product stage, supplier type, CAD / BOM / sample disclosure, tooling, IP, and supplier-control issues before approaching China-side suppliers too broadly.
Explore Hardware Supplier Search & ControlFrequently Asked Questions
Why should disclosure to a Chinese supplier be phased?
Phased disclosure matches what you share to the current stage of the supplier relationship and the level of protection in place. Once files are shared, they cannot be recalled. Phasing ensures more sensitive information is shared only when the appropriate NNN or manufacturing agreement is in place.
What should I share in Phase 1 — initial supplier screening?
Product category and function, approximate dimensions and materials, target certifications, production volume and timeline. Not CAD files, detailed specs, BOM, PCB, firmware, brand name, or pricing. Phase 1 is for assessing supplier fit — not disclosing the design.
What is the most common disclosure mistake hardware founders make?
Sending full CAD files and detailed product specifications in the first supplier email — before the NNN is signed and before the supplier is verified. Once files are out, they cannot be recalled, and the control structure needs to be negotiated retroactively.
What is the prerequisite before Phase 3 disclosure?
A signed manufacturing or OEM agreement covering tooling ownership, file ownership, quality terms, and exit terms. Phase 3 is when full production file disclosure is appropriate — because the agreement structure protects what you are sharing. Moving to Phase 3 disclosure before this agreement is in place reverses the protection sequence.
On this page
Related Resources
Further reading on disclosure structure, NNN agreements, and the supplier engagement sequence.
What Should I Say Before Sending CAD Files to a Chinese Manufacturer?
What to confirm, request, and put in writing before attaching product files in a supplier message.
Read Answer Practical AnswerHow Hardware Founders Should Sequence NNN, Sampling, and Tooling
The order that prevents avoidable IP and control problems: review → NNN → sampling → tooling terms → manufacturing controls.
Read Answer ServiceHardware Supplier Search & Control First Step
A structured first step for hardware founders preparing to find, evaluate, or approach China-side suppliers before sending sensitive product files too broadly.
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