Sodium CMC Acceptance Checklist: COA, Sampling and Batch Release

SINO-CMC February 25, 2022 4:19 pm

Receiving sodium carboxymethyl cellulose (CMC) is a quality decision, not just a check that the bags have arrived. Before releasing a batch for production, compare its identity, packaging, certificate of analysis (COA) and agreed test results with the approved specification.

This guide is a buyer checklist. Sampling quantities, acceptance limits and retest rules must follow the applicable product standard and the written agreement between buyer and supplier; there is no single sampling percentage that suits every CMC shipment.

1. Agree the specification before shipment

Record the product grade, intended application and approved specification version. Identify which characteristics require batch testing and which are covered by supporting documents. For viscosity, state the solution concentration, temperature, instrument, spindle or measurement method and preparation time. Results measured under different conditions are not directly comparable.

Depending on the grade and application, the agreed checks may include viscosity, degree of substitution, purity, loss on drying, pH, particle size and other required chemical or microbiological limits. Use application specific limits rather than a generic CMC specification.

2. Check documents and packaging on receipt

  • Match the purchase order, grade, bag labels and COA batch number.
  • Check quantity, packaging condition, seals and signs of moisture exposure or contamination.
  • Review the batch results against the agreed limits and confirm the stated test methods.
  • Keep photos and a receiving record for damaged, wet or incorrectly labelled bags.

For food applications, review the required grade and supporting documents through the food grade CMC product page. A COA should be evaluated together with the approved specification and intended use.

3. Take representative samples using an agreed plan

Define the number of bags to sample, sampling locations, sample quantity and handling method before opening the shipment. Use clean, dry tools and suitable containers. Identify every sample with the supplier, product, batch, bag or sampling location, date and sampler.

If the approved procedure uses a composite sample, retain traceability to the individual samples. Keep a sealed retention sample under suitable storage conditions so that later investigations can use material from the same batch.

4. Compare laboratory and application results

Use the same preparation and measurement conditions as the approved sample. Record observations such as dispersion, lumps, incomplete hydration and solution appearance alongside numerical results. A viscosity difference can arise from preparation or measurement conditions as well as a material difference.

For a critical application, run the agreed production or laboratory trial before releasing an unfamiliar batch. See the CMC viscosity comparison guide and sample to commercial batch approval workflow for related evaluation steps.

5. Record the release, hold or rejection decision

If a result is outside the agreed limit, place the affected material on hold and investigate before use. Check sample identity, instrument settings and test preparation. Apply the agreed retest procedure; do not substitute an improvised sampling rule or silently average away a failing result.

Document the final decision, responsible reviewer and supporting evidence. If buyer and supplier disagree, compare methods and retained samples first, then use the agreed independent testing or dispute resolution procedure.

Prepare a CMC acceptance checklist with SINOCMC

When contacting SINOCMC, share your application, required grade, viscosity test conditions and document requirements. Our team can discuss the available specification and sample evaluation with you. Send your CMC requirements before placing an order.

SINOCMC Team