Short answer: A Vietnam-based shoe factory ran a pre-mass-production trial on suede pairs: sealed boxes with A505 chips versus silica-gel-only controls. The trial locked placement SOP and chip count before bulk packing, reducing the risk of discovering mold only after ocean transit.
| Client type | Vietnam-based shoe factory (anonymous) |
|---|---|
| Material | Suede |
| Shipment route | Trial in factory lab / sealed carton hold (pre-ship) |
| Transit time | N/A (pre-production trial) |
| Problem | Brand required anti-mold proof before bulk PO |
| Products used | A505 |
| Result | SOP approved; bulk line adopted one chip per box |
The problem
The brand would not release a large suede PO until the factory showed a documented packing trial — not only a supplier brochure.
Root cause
- Suede is high-risk — porous uppers hold moisture and nutrients for mold.
- No locked SOP — operators placed silica gel inconsistently; no vapor-phase chip rule.
- Audit gap — buyers asked for REACH/DMF files plus a practical packing test.
The solution
- Split sample lots: Control = silica gel only; Trial = silica gel + one A505 chip fixed to the box wall.
- Seal and hold under agreed factory conditions; photograph placement.
- Issue placement SOP and attach mold-growth Grade 0 (2025FM00761R01D) / REACH / DMF pack for the brand file.
Result
Brand QA accepted the trial pack-out. Mass production used one A505 chip per sealed box. Compliance pack referenced REACH SVHC Compliance Test — 251 SVHC substances + 4 potential SVHCs, all not detected (≤ 0.1% w/w).
Limitations
A short factory hold is not a full ocean voyage. It validates placement discipline and documentation readiness; ocean risk still needs container desiccant on long lanes.
Relevant test data
According to test report No. 2025FM00761R01D from Guangdong Provincial Microbiological Analysis and Testing Center (method DA/T 26-2000, issued 2025-02-26) — Mold Growth Rating: Grade 0, 28-day test, 8 mold species, tested on paper/cloth/leather — all three materials showed zero visible mold growth, A505 anti-mold chips inhibit spore germination throughout the test period.
FAQ
Should suede export lines trial A505 before mass production?
Yes when the brand requires evidence. A documented chip-vs-control pack-out is faster to approve than arguing after a claim.
Where do chips go in the box?
Fixed to the inner wall, not stuck on the upper, so vapor can fill the sealed volume.