This International Standard specifies a method for determining ε-caprolactam and ω-laurolactam in polyamides by gas chromatography. It is suitable particularly for the determination of ε-caprolactam in polyamide 6 and ω-laurolactam in polyamide 12. Bearing in mind that gas chromatography offers a wide range of possible conditions, the method specified is that shown to have been suitable in practice.
Two variants of the basic method are specified:
— Method A is an extraction method with boiling methanol, and the extract is injected into a gas chromatograph.
— Method B is a method using a solvent, and the solution is injected into a gas chromatograph.
Method A is suitable for the determination of e-caprolactam and method B for e-caprolactam and co-laurolactam.
ISO 11337:2004 history
2023ISO 11337:2023 Plastics — Polyamides — Determination of ε-caprolactam and ω-laurolactam by gas chromatography
2010ISO 11337:2010 Plastics - Polyamides - Determination of ε-caprolactam and ω-Laurolactam by gas chromatography
2007ISO 11337:2004/Cor 1:2007 Plastics - Polyamides - Determination of -caprolactam and -laurolactam by gas chromatography; Technical Corrigendum 1
2004ISO 11337:2004 Plastics - Polyamides - Determination of -caprolactam and -laurolactam by gas chromatography