There are a series of verification and control procedures within the production chain of all production phases, from the incoming raw materials to the outgoing finished product. The various checks are carried out according to schedules defined by IFAP laboratory staff or at external, consolidated laboratories, and also accredited ones, according to requirements.

Internal controls

• Bottle wall thickness control.
• Dimensional control and bottle axial load.
• Acetaldehyde content control in preforms.
• Control of T% on thick and opaque samples, by using a spectrophotometer with integrating sphere.
• Internal thickness control of Multilayer preform, using a microscope equipped with software for vision and measurement.
• Weight and concentricity control of the preform.
• Visual inspection of the preform and dimensional control of the thread using go/no go gauges.
• Control using Polarised Light of the preform flux lines.

External controls

• Intrinsic Viscosity Control through the ISO and ASTM method.
• Carboxylic End Groups control.
• CIE-LAB colour check.
• % Crystallinity.
• Differential scanning calorimetry (DSC) test.
• Ash control.
• Humidity Control.
• Stress-cracking test according to UNI standard.
• Overall and Specific migration test.
• Screening analysis of volatile, semi-volatile and non-volatile substances.