Verifying Mass Balance Ledgers for Chemical Recycled Polymers
Verifying chemical recycled polymer mass balance ledgers requires physical boundary mass-loss accounting, yield deductions, and batch-level credit transfer documentation.
Organochlorine Screening
Meaning
Analytical test used to identify the presence of chlorine-containing organic molecules in raw resin or recycled feedstock. Organochlorine screening helps prevent the contamination of high-purity polymers with polyvinyl chloride or chlorinated flame retardants. It is a necessary step for ensuring that recycled plastics do not release corrosive gases during injection moulding.
Contaminant Detection
Chlorine atoms in a polymer melt can lead to the formation of hydrochloric acid which damages steel moulds. The organochlorine screening process uses X-ray fluorescence or combustion ion chromatography to detect even trace amounts of these elements.
Material Suitability
Deciding whether a batch of recycled flakes is fit for processing depends on its chemical purity. If organochlorine screening reveals high levels of contamination, the material is diverted to lower-grade applications where thermal stability is less critical.
Analytical Procedure
Testing frequency increases when a recycler sources material from unknown or unvetted suppliers. Regular organochlorine screening protects the machinery from premature wear and ensures that the finished products do not contain hazardous substances that are banned by environmental regulations. This proactive approach reduces the risk of expensive production halts and helps maintain a consistent quality level across different batches of material.
Maintaining these records also provides a clear audit trail for customers who require proof of material safety for their own downstream manufacturing processes.