A natural plant extract manufacturer and OEM/ODM partner
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Do you issue a Certificate of Analysis (COA) with every batch?

Yes — every single batch ships with a COA, and a GC-MS chromatogram is attached to confirm identity and composition.

COA Coverage Per Batch

ParameterTested / Reported
Appearance & colorYes
Relative densityYes
Refractive indexYes
Acid valueYes
Ester valueYes
Heavy metals (Pb)Yes
Arsenic (As)Yes
Residual solventYes
GC-MS chromatogramYes — full fingerprint
Batch number & dateYes — full traceability
Each COA is stamped with the batch number, production date, and QC signature, creating an unbroken chain from the field to your warehouse. This satisfies both your internal supplier audit and your destination-market documentation requirements.

We also keep retained samples of every batch for 36 months (matching shelf life) so any quality dispute can be resolved objectively. Provide your lab's preferred COA template or parameter set and we will pre-format future certificates accordingly.

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This article was published on 2026-09-07, and last updated on 2026-09-07. The article will be continuously updated.

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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.

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