What quality control and in-house lab capabilities do you have?

Top operates in-house QC with: HPLC / GC for the key markers, solvent-residue and heavy-metal checks, peroxide/acid value (freshness), plus microbiology and moisture/ash per the relevant standards. Out-of-spec lots are blocked.

We can arrange third-party verification (SGS, Eurofins) at buyer cost and keep retention samples for re-testing within shelf life.

This article was published on 2026-09-22, and last updated on 2026-09-22. The article will be continuously updated.

Guilin Four Seasons Sunshine

sales@essentialoilsfactory.com

86 13367530509

Founded in 2006, Guilin Four Seasons Sunshine F&F Co., Ltd. is a natural plant extract manufacturer and OEM/ODM partner in Guilin, China, combining proprietary Living-Fragrance physical extraction with supercritical fluid extraction to deliver pure, traceable botanical ingredients to global food, flavor, fragrance and personal care brands. test

What quality control and in-house lab capabilities do you have?

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