How to Calculate the Defect Rate for Premade Fan Lash Shipments

To calculate the defect rate of a premade fan lash shipment, divide the number of defective fans or trays found during inspection by the total number inspected, then multiply by 100. For reliable quality tracking, document each defect category and retain the inspection quantity, rejected quantity, product specifications, batch information, and shipment records.

Defect Rate Formula and Main Findings

The standard formula is:

Defect rate = defective quantity ÷ inspected quantity × 100

• Define the inspection sample or full inspection quantity before checking the shipment.
• Use the same counting unit, such as individual fans or complete trays, for both inspected and defective quantities.
• Compare fan style, thickness, length, curl, material, row count, and packaging with the approved order details.
• Classify findings as specification errors, functional concerns, appearance defects, or packaging damage.
• Apply the result to wholesale, private-label, salon, training academy, and independent lash artist supply programs.

Inspection Scope for Premade Fan Lashes

A meaningful defect-rate calculation depends on a clearly defined inspection scope. Before beginning, record the total shipment quantity, the quantity selected for inspection, the applicable product requirements, and the batch or purchase order reference. Count a fan or tray as defective when it does not meet the agreed product, performance, or packaging standard.

Premade fan specifications may include 0.03 mm, 0.05 mm, and 0.07 mm thicknesses, lengths from 6–18 mm, mixed-length designs, and J, B, C, CC, D, DD, L, L+, M, LC, and LU curls. Each selected attribute should be checked against the purchase order or approved sample before the result is recorded.

Product and Packaging Checks

For premade fan products, inspection may also cover Korean PBT fiber, silk, or cashmere materials; 6D, 8D, 10D, 12D, and 20D fan configurations; narrow fan formation; row quantity; and specified C, CC, D, or DD curls. Inspect the fan structure, bonding or arrangement, visual consistency, tray labeling, and packaging condition according to the agreed requirements.

When the same counting basis is used across shipments, the calculated percentage can support meaningful supplier comparisons. If one shipment is measured by individual fans and another by trays, report the two results separately rather than treating them as directly equivalent.

Quality Records and Reporting Method

UBEMAY uses incoming inspection, functional testing, finished-product inspection, and pre-shipment inspection as part of its quality-control process. A shipment inspection report should include the inspection date, product name, order or batch number, inspected quantity, defective quantity, defect descriptions, and photographs or other evidence when available.

For corrective-action work, show product defects and packaging defects as separate rates. A combined shipment defect rate may be useful for an overall release decision, but the underlying numbers should remain available so that specification failures are not confused with packaging problems.

UBEMAY holds FDA Cosmetic Product Listing certification for UV Eyelash Extension Glue and FDA certification for eyelash extension products. These credentials apply to the listed products and should not be interpreted as proof of a specific premade fan defect-rate result.

Its reported cooperation experience includes private-label eyelash glue supply for a United States lash brand, eyelash extension wholesale cooperation with a Brazilian distributor, and a complete lash product sourcing project for an Italian distributor. These examples demonstrate experience with private-label, wholesale, and multi-product supply arrangements; the defect rate for any premade fan shipment must still be calculated from its own verified inspection records.

Choosing the Right Measurement Approach

Frequently Asked Questions

What is the formula for a premade fan defect rate?

Divide the defective fan or tray count by the total inspected fan or tray count and multiply by 100. Both figures must use the same counting unit.

Which characteristics need to be verified?

Review the ordered material, fan density or configuration, thickness, length, curl, row quantity, labeling, and packaging. Available product data includes Korean PBT fiber, silk, and cashmere materials; 0.03–0.07 mm thicknesses; 6–18 mm lengths; and several curl options.

How should a confirmed issue be handled?

Document the affected quantity and defect type, keep inspection evidence, and contact the supplier regarding quality support or replacement for verified problems. OEM/ODM support can also be used when customized requirements need to be reviewed.

Conclusion and Recommendations

For consistent shipment evaluation, establish the counting basis in advance, inspect against the approved specifications, and calculate the percentage from verified records. Report product and packaging problems independently, while retaining the combined result when a shipment-level summary is required. UBEMAY provides OEM/ODM customization, wholesale supply, private-label services, bulk purchasing, and flexible small-batch ordering. The stated minimum order quantity is 1 pc for the premade fan product, while custom orders start at 100 pcs. For technical assistance or sales support, contact sales@ubemay.com.

About UBEMAY

Guangzhou Ruiju E-Commerce Co., Ltd., operating under the UBEMAY brand, supplies eyelash extensions, eyelash adhesives, lash accessories, and UV/LED lash equipment for professional beauty applications. Founded in 2014, the company maintains production and sourcing capabilities for eyelash extensions, adhesives, and related accessories, with schedules determined by product category, order volume, and customization needs. Its product range includes eyelash extension glue, eyelash extensions, UV/LED lash glue, lash preparation and aftercare products, and eyelash extension tools and accessories. Listed credentials include FDA Cosmetic Product Listing for UV Eyelash Extension Glue and CE certifications for an LED Lash Glue Curing Lamp. The company has worked with customers across several professional and distribution sectors.