How do you ensure batch-to-batch consistency and traceability?
Top controls consistency through Q/XXXX and per-batch QC matched to the reference profile. Traceability runs raw-material source through processing to the finished product with a lot-specific ledger and retention sample.If your application needs tight tolerances, tell Top and we can select lots from the same source or blend to a target profile. Every shipment carries a lot number linking to the COA and assay on file.
What does longan-concrete look and smell like?
AppearanceA brown to reddish-brown viscous concrete/paste. Odour/TasteCharacteristic sweet, fruity longan odour.Because it is a natural aromatic material, the aroma is the natural Dimocarpus longan Lour. (longan) character. Sensory evaluation follows an in-house panel; Top provides the odour/flavour description on the COA and can supply a reference sample.Store sealed, away from light/heat/moisture.
What after-sales support do you provide?
Top provides ongoing support: lot traceability and re-test within shelf life using the retention sample, documentation re-issue (COA / SDS / origin / health / phytosanitary cert copies), formulation advice and a responsive complaint channel. For LTA buyers we assign a dedicated contact and periodic review of grade consistency.We treat the relationship as long-term — the after-sales step is where we protect your production continuity, not an afterthought.
How do you authenticate longan-concrete and screen for adulteration?
Top authenticates by:HPLC for sugars and GC for the fruity-floral volatile fingerprint matched to the natural Dimocarpus longan Lour. (longan) profile and the GC/MS fingerprintGC/MS fingerprint plus targeted adulterant screeningSpecies + "Dimocarpus longan Lour. (longan) species-specific raw material" declaration on COAHeavy metals + microbiology per food-safety.Every lot ships with COA plus assay. We screen adulterants, heavy metals and solvent residue.Lots failing the natural profile or exceeding limits are blocked.
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 benzyl / indole 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 jasmine, we particularly recommend the GC-MS benzyl / indole fingerprint to confirm natural profile, plus a solvent-residue check.
What is your sustainability and responsible-sourcing approach?
Top sources Jasminum sambac flowers through contracted Guangxi orchards (Hengxian / Hengzhou and adjoining regions) with a flower-to-extraction ledger (origin → harvest window → extraction → concrete). Jasmine 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 jasmine is a low-yield, night-fragrance, weather-sensitive crop, we emphasize fair, documented flower sourcing and buffer stock to protect buyers...
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.Jasmine sambac 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 indolic floral 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 jasmine sambac concrete seasonal, and how does that affect availability?
Yes — Jasminum sambac flowers over a warm-season window and the fresh flower is perishable (with night-peaking fragrance driving same-night processing), 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 jasmine sambac concrete as a distinct line from jasmine sambac essential oil /...