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83 Rubber and plastic industries
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ISO 24829:2026
Plastics — Polyether polyols and polymer polyols — Determination of aldehydes and ketones
Scope: This document specifies the determination of aldehydes and ketones content in polyether polyols and polymer polyols by high performance liquid chromatography (HPLC).
This document is applicable to the determination of formaldehyde (HCHO), acetaldehyde (CH3CHO), acrolein (CH2=CHCHO) and acetone (CH3COCH3) in polyether polyols and polymer polyols.
This document is applicable to the determination of formaldehyde (HCHO), acetaldehyde (CH3CHO), acrolein (CH2=CHCHO) and acetone (CH3COCH3) in polyether polyols and polymer polyols.
Base documents:
ISO/TR 19032:2026
Plastics — Use of polyethylene reference film (PERF) for monitoring laboratory and outdoor weathering conditions
Scope: This document describes a method that demonstrates the use of polyethylene reference film (PERF) for monitoring laboratory and outdoor conditions as a weathering reference material in weathering tests used for plastics.
Base documents:
Replaces: ISO/TR 19032:2019
ISO 844:2026
Rigid cellular plastics — Determination of compressive properties
Scope: This document specifies methods for determining the compressive strength, the corresponding compressive strain, the compressive stress at 10 % nominal compressive strain, and the compressive modulus of rigid cellular plastics.
Two procedures are specified. Procedure A and Procedure B.
Procedure A utilizes the compression plate displacement for the nominal property determination. It is used to determine:
compressive strength and the corresponding nominal compressive strain;
compressive stress at 10 % nominal compressive strain;
nominal compressive modulus.
Procedure B uses an extensometer and determines the conventional properties. It is used to determine:
compressive strength and the corresponding compressive strain;
compressive modulus.
Two procedures are specified. Procedure A and Procedure B.
Procedure A utilizes the compression plate displacement for the nominal property determination. It is used to determine:
compressive strength and the corresponding nominal compressive strain;
compressive stress at 10 % nominal compressive strain;
nominal compressive modulus.
Procedure B uses an extensometer and determines the conventional properties. It is used to determine:
compressive strength and the corresponding compressive strain;
compressive modulus.
Base documents:
Replaces: ISO 844:2021
Replaced standards
ISO/TR 19032:2019
Plastics -- Use of polyethylene reference specimens (PERS) for monitoring laboratory and outdoor weathering conditions
Scope: This document describes a method that demonstrates the use of polyethylene reference specimens (PERS) for monitoring laboratory and outdoor conditions in weathering tests used for plastics.
Base documents:
Replaced: ISO/TR 19032:2026
ISO 844:2021
Rigid cellular plastics — Determination of compression properties
Scope: This document specifies methods for determining the compressive strength and corresponding relative deformation, the compressive stress at 10 % relative deformation, and the compressive modulus of rigid cellular plastics.
Base documents:
Replaced: ISO 844:2026
Drafts
prEN ISO 1628-2
Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 2: Poly(vinyl chloride) resins (ISO/DIS 1628-2:2026)
Scope: 1.1 This document specifies conditions for the determination of the reduced viscosity (also known as viscosity number) and K-value of PVC resins. It is applicable to resins in powder form which consist of homopolymers of the monomer vinyl chloride and copolymers, terpolymers, etc., of vinyl chloride with one or more other monomers, but where vinyl chloride is the main constituent. The resins may contain small amounts of unpolymerized substances (e.g. emulsifying or suspending agents, catalyst residues, etc.) and other substances added during the course of the polymerization. This document is not applicable, however, to resins having a volatile-matter content in excess of 0,5 % ± 0,1 %, when determined in accordance with ISO 1269. In addition to this, it is not applicable to resins which are not entirely soluble in cyclohexanone.
1.2 The reduced viscosity and K-value of a particular resin are related to its molecular mass, but the relationship varies depending on the concentration and type(s) of other monomer(s) present. Hence, homopolymers and copolymers having the same reduced viscosity or K-value might not have the same molecular mass.
1.3 The values determined for reduced viscosity and K-value, for a particular sample of PVC resin, are influenced differently by the concentration of the solution chosen for the determination. Hence the use of the procedures described in this document only gives values for reduced viscosity and K-value that are comparable when the concentrations of the solutions used are identical.
1.4 Limiting viscosity number is not used for PVC resins.
1.5 The experimental procedures described in this document can also be used to characterize the polymeric fraction obtained during the chemical analysis of a PVC composition. However, the values calculated for the reduced viscosity and K-value in these circumstances might not indicate the actual values for the resin used to produce the composition because of the impure nature of the recovered polymer fraction.
1.2 The reduced viscosity and K-value of a particular resin are related to its molecular mass, but the relationship varies depending on the concentration and type(s) of other monomer(s) present. Hence, homopolymers and copolymers having the same reduced viscosity or K-value might not have the same molecular mass.
1.3 The values determined for reduced viscosity and K-value, for a particular sample of PVC resin, are influenced differently by the concentration of the solution chosen for the determination. Hence the use of the procedures described in this document only gives values for reduced viscosity and K-value that are comparable when the concentrations of the solutions used are identical.
1.4 Limiting viscosity number is not used for PVC resins.
1.5 The experimental procedures described in this document can also be used to characterize the polymeric fraction obtained during the chemical analysis of a PVC composition. However, the values calculated for the reduced viscosity and K-value in these circumstances might not indicate the actual values for the resin used to produce the composition because of the impure nature of the recovered polymer fraction.
Base documents: ISO/DIS 1628-2; prEN ISO 1628-2
prEN ISO 1628-5
Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 5: Thermoplastic polyester (TP) homopolymers and copolymers (ISO/DIS 1628-5:2026)
Scope: This part of ISO 1628 specifies a method for the determination of the viscosity number (also referred to as "reduced viscosity") of dilute solutions of thermoplastic polyesters (TPs) in certain specified solvents.
The method is applicable to poly(ethylene terephthalate) (PET), poly(butylene terephthalate) (PBT), poly(cyclohexylenedimethylene terephthalate) (PCT), and poly(ethylene naphthalate) (PEN), as well as to copolyesters and other polyesters, referred to in ISO 20028-1:2019, that are soluble in one of the specified solvents under the specified conditions.
The viscosity number is determined by the general procedure specified in ISO 1628-1:2024, observing the particular conditions specified in this part of ISO 1628.
The determination of the viscosity number of a thermoplastic polyester provides a measure of the relative molecular mass of the polymer.
The method is applicable to poly(ethylene terephthalate) (PET), poly(butylene terephthalate) (PBT), poly(cyclohexylenedimethylene terephthalate) (PCT), and poly(ethylene naphthalate) (PEN), as well as to copolyesters and other polyesters, referred to in ISO 20028-1:2019, that are soluble in one of the specified solvents under the specified conditions.
The viscosity number is determined by the general procedure specified in ISO 1628-1:2024, observing the particular conditions specified in this part of ISO 1628.
The determination of the viscosity number of a thermoplastic polyester provides a measure of the relative molecular mass of the polymer.
Base documents: ISO/DIS 1628-5; prEN ISO 1628-5
prEN ISO 307
Plastics - Polyamides - Determination of viscosity number (ISO/DIS 307:2026)
Scope: This document specifies a method for the determination of the viscosity number of dilute solutions of polyamides in certain specified solvents.
The method is applicable to the polyamides designated PA 46, PA 6, PA 66, PA 69, PA 610, PA 612, PA 11, PA 12, PA 6T/66, PA 6I/6T, PA 6T/6I/66, PA 6T/6I, PA 6I/6T/66 and PA MXD6 as defined in ISO 16396-1, as well as to copolyamides, compounds of polyamides and other polyamides that are soluble in one of the specified solvents under the specified conditions.
The method is not applicable to polyamides produced by anionic polymerization of lactams or produced with cross-linking agents; such polyamides are normally insoluble in the specified solvents.
The viscosity number is determined by the general procedure specified in ISO 1628‑1, observing the particular conditions specified in this document.
The method is applicable to the polyamides designated PA 46, PA 6, PA 66, PA 69, PA 610, PA 612, PA 11, PA 12, PA 6T/66, PA 6I/6T, PA 6T/6I/66, PA 6T/6I, PA 6I/6T/66 and PA MXD6 as defined in ISO 16396-1, as well as to copolyamides, compounds of polyamides and other polyamides that are soluble in one of the specified solvents under the specified conditions.
The method is not applicable to polyamides produced by anionic polymerization of lactams or produced with cross-linking agents; such polyamides are normally insoluble in the specified solvents.
The viscosity number is determined by the general procedure specified in ISO 1628‑1, observing the particular conditions specified in this document.
Base documents: ISO/DIS 307; prEN ISO 307
prEN ISO 1628-3
Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 3: Polyethylenes and polypropylenes (ISO/DIS 1628-3:2026)
Scope: ISO 1628-3:2010 defines particular conditions for determining the reduced viscosity (also known as viscosity number) and intrinsic viscosity of polyethylenes and polypropylenes at 135 °C in dilute solution.
The viscosity of polymer solutions may be affected by additives present in the sample. The value of a reduced viscosity determined by this method may therefore be unreliable if the sample contains fillers or other additives.
The viscosity of polymer solutions may be affected by additives present in the sample. The value of a reduced viscosity determined by this method may therefore be unreliable if the sample contains fillers or other additives.
Base documents: ISO/DIS 1628-3; prEN ISO 1628-3