Short answer: A factory side-by-side trial compared A505 chips and C304 anti mold bags in sealed export boxes. A505 was selected for peak-season and higher-value leather/suede lines; C304 for standard high-volume packs where bag format was easier on the line. Both suppress spore germination — they are not desiccants.
| Client type | Footwear factory (anonymous) |
|---|---|
| Material | Leather / suede / standard lines |
| Shipment route | Export mixed |
| Transit time | Varies |
| Problem | Unclear which SKU to standardize |
| Products used | A505 vs C304 |
| Result | Season / value-based SKU split locked in SOP |
The problem
Purchasing wanted one SKU for all boxes. Packing supervisors said bags were faster on some lines; brand QA preferred chip format for premium suede.
Root cause
- Format ≠ chemistry class — Both are vapor-phase anti-mold inserts; choice is application fit.
- Season risk differs — Peak humidity months need stricter placement discipline.
- No trial matrix — Decisions were made from price lists only.
The solution
- Define matrix: material × season × box size.
- Run parallel lots: A505 chip vs C304 bag, same seal method.
- Score: placement compliance, operator time, brand preference, documentation pack.
Result
SOP split: A505 for peak-humidity / premium leather-suede; C304 for standard volume cartons. Both referenced the same compliance pack: REACH SVHC Compliance Test — 251 SVHC substances + 4 potential SVHCs, all not detected (≤ 0.1% w/w); DMF not detected (< 0.1 mg/kg).
Limitations
This is an application trial, not a claim that one SKU “kills mold better” in every climate. Neither SKU replaces dry materials or container poles on long ocean lanes.
Comparison table
| Factor | A505 chip | C304 anti mold bag |
|---|---|---|
| Typical use | Peak season / higher-value boxes | Standard high-volume packing |
| Form | Chip / sticker-style insert | Bag sachet |
| Action | Vapor-phase — inhibit germination | Vapor-phase — inhibit germination |
| Not a substitute for | Desiccant / dry warehouse | Desiccant / dry warehouse |
Relevant test data
According to SGS test report (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
When should a factory choose A505 vs C304?
Match season, material risk, and packing-line format — then lock one SOP per line. Do not mix randomly inside one PO.
Are both REACH / DMF documented?
Yes. See Testing & Compliance Center.