Shelf Life36 months from production (sealed, cool, dark). Strict ProtectionSealed, away from light/heat/moisture; cool (<25C) and dry storage; refrigerate for long-term.Top formulates within regulatory limits and packs under clean, low-moisture conditions It may thicken at low temperature — normal; re-liquefies on warming. Re-test before the end of shelf life.The COA notes the production date and recommended storage.

Availability is governed by processing capacity and raw-material scheduling rather than a single harvest window. Top keeps buffer stock of standard grades and contracts raw material volume; for large or steady volumes we recommend an LTA to reserve processing slots and stabilize price.We communicate raw-material market conditions on each quotation.

Top supports evaluation with 5-10 g samples (sometimes up to about 20 g for qualified buyers), drawn from current stock or a fresh batch, shipped with COA plus assay. 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 profile matches your production batch. Sample lead time is short (stock) or aligned with the next production window.Tell Top your application and preferred grade and we will suggest a representative sample.

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 batch is needed, 10-20 days (sourcing plus processing plus QC).Top can express-ship via DHL / FedEx. As a low-hazard material, samples ship with an SDS where applicable. Provide your courier account or let Top quote the freight.

Because this is a natural, batch-specific material, returns are handled case-by-case. If Top's own lot data (COA plus assay) 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.

From the the longan aril / pulp (after shell and seed removal). Top's COA states "raw material: Dimocarpus longan aril".The aril is extracted; no bark or resin is involved.