Monday 1 January 2024

Plastic Part Marking Codes of Aliphatic and Semi-Aromatic Polyamides (ISO 16396-1:2022 -prev. ISO 1874)

Plastic Part Marking Codes of Polyamides 

Hello and welcome to the first post of the new year 2024! I hope you had a great Christmas break and I welcome you all back to a new exciting year of polymer engineering topics. 

Let us start with a community question which is about the part marking codes for Polyamides, in particular the ISO 16396 (previously ISO 1874). 

In my previous posts I discussed mainly the ISO 1043 for part marking since it covers all polymers. However, apart from the ISO 1043, the ISO 16396 was established to deal with the wide range of Polyamides. 

What is the ISO 16396 (previously ISO 1874) exactly?

The ISO 16396-1:2022 (prev. ISO 1874) [1]: Polyamide moulding and extrusion materials was introduced particularly for Polyamides used in injection moulding and extrusion (PA 6, PA 66, PA 69, PA 610, PA 612, PA 11, PA 12, PA MXD6, PA 46, PA 1212, PA 4T, PA 6T and PA 9T and copolyamides of various compositions for moulding and extrusion). 

The designation consists out of five data blocks:

-Data block 1: identification of the plastic by its abbreviated term (PA), and information about the chemical structure and composition

-Data block 2: position 1: Intended application and/or method of processing; positions 2 to 8: Important properties, additives and supplementary information

-Data block 3: designatory properties

-Data block 4: fillers or reinforcing materials and their nominal content

-Data block 5:  contains additional information which may be added if needed

Example: PA6T/66 MH, 14-190, GF50

PA6T/66: Polyamide 6T which is a homopolymer based on terephthalic acid (TPA) / hexamethylenediamine together Polyamide 66 which is based on hexamethylenediamine and adipic acid. 

M: injection moulding; H: heat ageing stabilized

14-190: viscosity number (in ml/g) > 130 but below 150; 190: tensile modulus of elasticity between 17000 MPa and 20000 MPa

High heat Polyamides - plastic part marking examples

In Table 1 I summarized commonly used high heat Polyamides which allows you to quickly identify the plastic used for a certain part or to use it for your next project where in the end the part marking question may come up.

Table 1: High heat Polyamides - plastic part marking examples.

Data block 1 Data block 2 Data block 3 Data block 4 Description
PA6T/6I MH 12-110 GF30 PA based on TPA (6T) and IPA (Isophthalic acid; 6I) with 30 wt% glass fiber; injection moulding; heat stabilized;viscosity number >110-130; Elastic modulus >10.5 -11.5 GPa
PA6T/66 MH 14-250 CF30 PA based on TPA (6T) and PA 6.6 with 30 wt% carbon fiber; injection moulding; heat stabilized; viscosity number >130-150; Elastic modulus >23 GPa
PA 10T/X MH 14-100 GF30 PA based on 1,10-decamethylene diamine (10) and terephthalic acid (T) with 30 wt% glass fiber; injection moulding; heat stabilized; viscosity number >130-150; Elastic modulus >9.5-10.5 GPa

More examples of part marking codes for different plastics compounds can be found here and for PolyArylAmides here. I wrote a miniguide on this topic too, which can be downloaded here.

Thank you for reading and #findoutaboutplastics


Herwig Juster

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