Factory Sampling in China: From Tech Pack to Final Approval Sample
Sampling is one of the most important stages in China manufacturing. It is also one of the most misunderstood.
Many buyers believe a sample is simply a small version of the final product. In reality, sampling is a communication process. It helps the buyer and factory confirm design, materials, structure, workmanship, cost, and production feasibility before bulk production begins.
A good sample process reduces risk. A poor sample process creates delays, extra cost, and disputes.
Whether you are producing apparel, bags, shoes, packaging, accessories, or consumer goods, the principle is the same: the factory can only make what has been clearly defined.
1. Start with a Clear Tech Pack
A tech pack is the technical instruction document for a product. It tells the factory what to make and how to make it.
For apparel, a tech pack may include:
- Design drawings
- Measurements
- Size chart
- Fabric specification
- Color references
- Stitching details
- Print or embroidery position
- Label placement
- Washing method
- Packaging method
For bags or accessories, it may include:
- Dimensions
- Material type
- Hardware specification
- Zipper details
- Lining material
- Strap length
- Logo method
- Edge finishing
- Carton packing
For packaging, it may include:
- Structure drawing
- Material thickness
- Printing colors
- Surface finish
- Dimensions
- Insert design
- Barcode placement
- Export carton requirements
The tech pack does not need to be perfect at the beginning, but it must be clear enough for the factory to quote and begin development.
2. Reference Samples Help, But They Are Not Enough
Many buyers send reference photos or existing products and ask the factory to make something similar. This can help the factory understand the direction, but it is not enough for accurate production.
A photo does not always show:
- Exact material
- Thickness
- Internal structure
- Stitching method
- Weight
- Color standard
- Hidden components
- Packaging requirement
- Tolerance range
If the buyer only sends pictures, the factory will make assumptions. Those assumptions may not match the buyer’s expectations.
A better approach is to provide both reference images and written specifications.
3. Material Sourcing Before Sampling
Before making a sample, the factory may need to source fabric, leather, plastic, hardware, paper, or other materials. This stage affects both cost and timeline.
Buyers should confirm whether the sample will be made with:
- Exact bulk material
- Similar available material
- Temporary substitute material
- Stock material for testing only
This distinction is important. A sample made with substitute material may show the shape and construction, but it does not fully represent the final product.
For serious orders, buyers should request material swatches and keep approved swatches as reference.
4. First Prototype Sample
The first prototype sample is used to check whether the factory understands the product concept. It may not be perfect. In fact, it often reveals problems.
The buyer should check:
- Overall shape
- Main construction
- Measurement accuracy
- Material direction
- Logo placement
- Basic workmanship
- Functionality
- Comfort or usability
- Whether the factory misunderstood any detail
At this stage, the buyer should provide clear revision comments. Vague feedback such as “make it better” is not useful. Specific feedback works better.
For example:
- Increase front pocket width by 2 cm
- Move logo 1.5 cm higher
- Change zipper color to antique silver
- Make handle material thicker
- Reduce sleeve length by 1 cm
- Use matte surface instead of glossy surface
Factories respond better to measurable changes.
5. Second Sample and Revision Cycle
The second sample should reflect the buyer’s corrections. If the first tech pack was unclear, there may be several rounds of revisions.
Each revision round costs time and sometimes additional money. This is why buyers should organize feedback carefully before sending it to the factory.
A good revision document should include:
- Photos of the sample
- Marked problem areas
- Written correction notes
- Measurement changes
- Material changes
- Color changes
- Confirmation of unchanged parts
Buyers should avoid sending scattered messages across several chat apps without a final summary. The final revision instruction should be in one clear document.
6. Fit Sample, Function Sample, and Appearance Sample
Different products require different sample priorities.
For apparel, fit is critical. A hoodie may look good in photos but fail if shoulder width, sleeve length, or body length is wrong.
For bags, function and structure are critical. The product must carry weight, open smoothly, and keep shape.
For shoes, comfort, mold accuracy, outsole structure, and size grading matter.
For packaging, dimensions, printing accuracy, material strength, and product fit are key.
Buyers should define what each sample is meant to test. Not every sample can confirm everything at once.
7. Pre-Production Sample
The pre-production sample is one of the most important samples. It should be made using final approved materials, final colors, final accessories, final logo method, and final workmanship.
This sample becomes the standard for bulk production.
Before approving it, the buyer should check:
- Final material
- Final color
- Final measurements
- Final logo
- Final hardware
- Final packaging
- Labeling
- Carton marks
- Workmanship standard
- Tolerance range
If the buyer approves a pre-production sample with unresolved issues, those issues may appear in the bulk order.
8. Approval Sample and Sealed Sample
Once the buyer approves the final sample, both sides should keep a sealed approval sample. This is a physical reference used during production and inspection.
A sealed sample helps answer disputes such as:
- Is the bulk color acceptable?
- Is the stitching quality consistent?
- Is the logo position correct?
- Is the material thickness the same?
- Is the packaging method correct?
For important orders, the buyer, factory, and inspection company should all work from the same approved standard.
9. Sample Cost and Refund Policy
Factories may charge sample fees. This is normal, especially for custom development. The fee may cover labor, material sourcing, pattern making, mold work, printing setup, or machine time.
Some factories refund the sample fee after bulk order confirmation. Others do not. Buyers should confirm this before starting.
Questions to ask:
- What is the sample fee?
- Is the fee refundable after bulk order?
- How long does sample production take?
- Does the fee include material sourcing?
- How many revisions are included?
- Is courier cost included?
A very cheap sample fee is not always better. If the factory does not invest time in the sample, the result may not be useful.
10. Common Sampling Mistakes
The most common sampling mistake is rushing into production before the product is fully confirmed.
Other mistakes include:
- Sending only photos without specifications
- Changing requirements after sample approval
- Not confirming material before sampling
- Not keeping a sealed sample
- Approving a sample with known defects
- Ignoring packaging until the end
- Not checking size grading
- Not confirming color under natural light
- Not documenting revisions clearly
Every unclear point becomes a possible production problem later.
11. How to Speed Up Sampling Without Losing Control
Sampling can be faster if the buyer prepares well.
Practical steps include:
- Send one complete tech pack instead of scattered messages
- Use clear measurement tables
- Provide reference samples when possible
- Approve material swatches early
- Confirm logo files in vector format
- Give consolidated revision comments
- Set a decision deadline for each stage
- Avoid changing the design after sample approval
Good preparation can reduce weeks of unnecessary back-and-forth.
