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Can we arrange third-party inspection (SGS / Eurofins)?
Yes. Top supports third-party inspection and testing by SGS, Eurofins or an agreed lab at buyer cost. OptionsPre-shipment sampling plus lab verification (GC-MS β-ionone fingerprint, melting point / refractive index, moisture, heavy metals, solvent residue), and factory audit.We share the lot number and retention sample so the inspector draws representatively. Tell Top which parameters and which lab, and we will coordinate the appointment and incorporate the result into the shipment documents.For osmanthus, we particularly recommend the GC-MS β-ionone fingerprint to confirm natural profile, plus a solvent-residue check.
What is your sustainability and responsible-sourcing approach?
Top sources Osmanthus fragrans flowers through contracted Guilin orchards with a flower-to-extraction ledger (origin → harvest window → salting → solvent extraction → concrete). Osmanthus is a farmed flowering shrub (not wild-harvested, not CITES), so sourcing is traceable and sustainable by cultivation.The solvent route is managed with recovery (residue-free, GB 5009.262 not detected). Buyers can request a supply-chain / origin declaration and (for dedicated lots) organic certification.We aim for transparent, documentable sourcing rather than vague natural claims. Because osmanthus is a low-yield, weather-sensitive autumn crop, we emphasize fair, documented flower sourcing and buffer stock to protect buyers from supply shocks.
How do you handle shipping and freight?
Top ships worldwide by sea or air under the agreed Incoterm. For sea we use FCL / LCL from Shanghai / Guangzhou; for air, DHL / FedEx / airline cargo.Osmanthus concrete is low-hazard (waxy, no strong DG class), but we still ship it with an SDS and use qualified forwarders. We provide tracking and can handle door-to-door or port-to-port.Freight is quoted separately from the product FOB price; tell Top your destination port / airport and preferred mode for a quote.
What is the shelf life and how should it be stored?
Shelf Life36 months from production (sealed, cool, dark, away from air; the floral aroma can dull and the wax can oxidize if exposed). Strict ProtectionKeep away from light, heat and air, store below about 15-20C, FIFO rotation, sealed / nitrogen-flanked packs.Top adds a tocopherol antioxidant on request and can provide a real-time + accelerated study. Re-test aroma/fingerprint beyond the midpoint.The COA notes the production date. Because it is a waxy concrete, warm gently (not overheated) to fluidize before use, and avoid repeated melt/freeze cycles.
Is osmanthus concrete seasonal, and how does that affect availability?
Yes — Osmanthus fragrans flowers in a concentrated autumn window and the fresh flower is perishable, so flower supply is seasonal and crop-dependent (weather and yield swing price and availability). Because the concrete is globally a low-volume precious material, the concrete itself needs planning.Top keeps buffer stock of standard grades and contracts flower volume; for large or steady volumes we recommend an LTA to reserve extraction slots and stabilize price against crop swings. We communicate flower-market conditions on each quotation. (Note: keep osmanthus concrete as a distinct line from osmanthus absolute / GD01 — concrete vs de-waxed matters.)
What is your sample policy for osmanthus concrete?
Top supports evaluation with 5-10 g samples (sometimes up to about 20 g for qualified buyers), drawn from current stock or a fresh extraction, shipped with COA plus GC-MS (β-ionone fingerprint). Samples are usually charged at the sample-tier price (or free for strategic / qualified accounts) plus freight.We recommend requesting the sample from the same lot you intend to purchase so the floral fingerprint and yield match your production batch. Sample lead time is short (stock) or aligned with the next extraction window.Tell Top your application and preferred grade and we will suggest a representative sample.
How much do samples cost and how fast do they ship?
Sample CostThe sample-tier unit price for 5-10 g (often waived for qualified / strategic buyers) plus international freight. Lead TimeStock samples 3-7 days; if a fresh extraction lot is needed, 10-20 days (flower sourcing plus extraction plus QC).Top can express-ship via DHL / FedEx. As a waxy concrete with low hazard, samples ship with an SDS. Provide your courier account or let Top quote the freight.
What is your returns and refund policy?
Because this is a natural, batch-specific concrete, returns are handled case-by-case. If Top's own lot data (COA plus GC-MS) confirms a specification failure, we arrange replacement or refund of the affected quantity; return of unused, sealed material may be requested for verification.For buyer-side issues (wrong grade ordered, changed mind), returns are by mutual agreement and may incur restocking. All returns/refunds follow the signed contract and Incoterms; we keep the process transparent and documented.
Which plant part is the concrete extracted from?
From the fresh, just-opened osmanthus flower (the blossom) — not leaf, stem or root. Top's COA states "raw material: fresh O. fragrans var. thunbergii flower".Because osmanthus flowers are tiny and low-yield, only the bloom is harvested at peak fragrance (autumn, Guilin), salted/color-protected, then solvent-extracted. The concrete carries the full floral wax + aroma complex (it is the "concrete", not the de-waxed "absolute"), so it is a paste/wax-like material — exactly why it is classed as a concrete rather than a fluid essential oil.