A Declaration of Conformity Covering Only the Base Polymer
Base polymer declarations certify monomer purity at the reactor gate but omit all converter additives, breakdown products, and finished article migration limits.
Base Polymer Declaration
Meaning
An official statement issued by a resin manufacturer specifies the chemical identity, grade, and regulatory compliance of the primary resin before any additives are compounded into it. This Base Polymer Declaration ensures that the downstream processor begins with a fully characterized and approved raw material. It forms the foundational documentation for all subsequent compliance certifications in the supply chain.
Chemical Specification
The certificate discloses the monomer ratios, catalyst residues, and polymerization conditions used during synthesis. It defines the resin without the influence of colorants, slip agents, or thermal stabilizers that the compounder might add later. This level of detail allows the processor to understand the intrinsic thermal stability and flow properties of the virgin polymer.
Moulding Implication
Moulders use this declaration to verify that the resin meets the mechanical and thermal specifications of the part design. If the polymer drifts from its certified limits, it can lead to issues like inconsistent melt viscosity, localized degradation, or unexpected shrinkage in the mould. It gives the operator a baseline to troubleshoot processing drift.
Regulatory Clearance
The document is often needed to prove that the primary resin is cleared for sensitive applications like food contact or medical devices. It is updated whenever the resin synthesis is modified.