Quality in chemical supply is mostly about discipline: knowing exactly what is in each container, being able to prove it, and making sure it arrives in the condition it left. This page describes the processes we follow for every order.
Our QC workflow
- Specification agreement. Before quoting, we confirm the grade and the specification basis, whether a pharmacopoeial monograph, an ACS or in-house specification, or limits you supply.
- Supplier review. We source from manufacturers whose analytical capability and documentation we have assessed, and we request current lot data rather than a generic specification sheet.
- Document check. The manufacturer's Certificate of Analysis is checked against the agreed specification. Any result outside limits, or any test missing, is resolved before the lot is offered.
- Receipt inspection. Incoming containers are checked for identity labelling, lot number, seal integrity and packaging condition.
- Additional testing on request. Where required, we arrange independent testing and report which laboratory performed it and by which method.
- Release and dispatch. The lot number on the container, the COA and the commercial documents are reconciled before dispatch.
What a Certificate of Analysis contains
Each lot is supplied with a Certificate of Analysis. A typical COA from us shows:
- Product name, synonyms where helpful, CAS number, molecular formula and molecular weight
- Grade and specification reference
- Lot or batch number, date of manufacture and retest or expiry date
- Each test parameter with its specification limit, the actual result and the method basis
- Typical tests such as appearance, identity (IR, NMR or HPLC retention), assay, water content, loss on drying, residue on ignition, related substances and residual solvents, as relevant to the product
- Recommended storage conditions
Safety Data Sheets and GHS
A Safety Data Sheet in the 16-section GHS format accompanies every shipment. Hazard classification, pictograms, signal words, hazard and precautionary statements, and transport information are aligned with the Globally Harmonized System. Where a destination has specific requirements, such as an EU REACH-compliant SDS or local-language versions, tell us at the quotation stage so that we can confirm what is available.
Traceability and batch numbers
Every container carries a lot number that links it to the manufacturer's batch, the COA, our receipt record and your invoice. If you have a question about a delivery months later, the lot number is all we need to retrieve its history. We do not mix lots within a single container, and multi-lot shipments are identified lot by lot on the packing list.
Storage and packaging standards
- Materials are stored according to the conditions stated on the SDS: ambient, refrigerated (2 to 8 °C) or frozen, protected from light and moisture as required.
- Hygroscopic, air-sensitive and light-sensitive products are packed in suitable containers, such as amber glass, sealed ampoules, or bottles under inert gas, depending on availability.
- Dangerous goods are packed in UN-specification packaging appropriate to their packing group and mode of transport.
- Labels show product name, CAS number, lot number, quantity, GHS pictograms and handling information.
Retained samples
For lots that we repack or subdivide, we keep a retained sample for a defined period, generally until at least the retest or expiry date, where the quantity and stability of the material allow. Retained samples let us investigate a complaint against the same material you received. For direct shipments of sealed manufacturer packs, we ask the manufacturer to reference their own retained sample.
Questions about a specific lot or document can be sent to query@vaqorachemicals.com with the product name and lot number.