O prefață
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ISO 3251-2019 “Determinarea compușilor nevolatili în Vopsele, lacuri si materiale plastice”

Any trade names used in this document are provided as information for the convenience of users and do not constitute an endorsement thereof.

Interpretare voluntară, related standards and conformity assessment related ISO specific terminology and express the meaning of and the ISO in the technical barriers to trade (TBT) adhere to the principle of the world trade organization (WTO) information, please refer to

Iso.org/iso/foreword.html.

This document is prepared by Technical Committee ISO/TC 35, Vopsele și lacuri, Subcomisia SC 9, General Test methods for paints and varnishes.

The fifth edition eliminates and replaces the fourth edition (ISO 3251:2008), care a fost revizuit tehnic. The main changes from the previous edition are as follows:

ISO 3251-2019 “Determinarea compușilor nevolatili în Vopsele, lacuri si materiale plastice”

To ISO 4618 – increased in clause 3 general reference of the terms and definitions:

— 4.5 example of desiccant to silica gel in orange, because no longer allowed to use cobalt chloride as the indicator;

— Corrected accuracy data for polymer dispersions: the figures given in the 2008 edition were ± data, which have now been correctly converted to percentages;

— General test parameters for paint powders (powder resins) have been removed from Table A.1 because ISO 8130-7 can be used instead;

— Added common test parameters for waterborne coatings in Table A.1.

Any feedback or question this file should be submitted to the national standards organizations of users. A full list of these agencies can be found at iso.org/members.html.

ISO 3251-2019 “Determinarea compușilor nevolatili în Vopsele, lacuri si materiale plastice”

Introducere
For methods that can be used for unplasticized polymer dispersions and rubber latex, the non-volatile residues (mainly composed of polymer materials and small amounts of additives, such as emulsifiers, protective colloids, stabilizers, solvents added as film forming agents and — especially for rubber latex concentrates — conservanti) need to be chemically stable under the test conditions. For plasticized samples, residues usually include plasticizers by definition.

ISO 3233 (toate piesele) specifies test methods for determining the content of non-volatile substances in paints, varnishments and related products.

1 Scopul aplicatiei
This document specifies a determination of paint, lac, paint and varnish binder, polymer dispersions and condensation resin (such as phenolic resin (JiaJie phenolic resin and novolac solution, etc.)) method of non-volatile matter content.

This method can also be applied to preparation containing fillers, pigments and other additives, such as thickening agent, film former dispersions.

Notă 1: the product of the volatile matter content is not absolute, but rather depends on the determination of the temperature and heating time. Prin urmare, when this method is used, only relative rather than true values of the non-volatile content can be obtained due to solvent retention, thermal decomposition, and evaporation of low molecular weight components. Prin urmare, this method is mainly used to test different batches of the same type of product.

Notă 2 This method is suitable for synthetic rubber latex, provided that heating for a specified period of time is considered appropriate (ISO 124 provides heating until the mass loss of 2 g of the test portion is less than 0.5 mg after continuous heating).

ISO 3251-2019 “Determinarea compușilor nevolatili în Vopsele, lacuri si materiale plastice”

Notă 3 Internal methods for determining nonvolatile substances usually include drying with infrared or microwave radiation. The standardization of this kind of method is impossible, because they are not universal. Several polymer compositions tend to break down during this treatment and therefore give incorrect results.

2 Documente normative de referință
In the article refer to the following documents, the requirements of some or all of the content of this document. Pentru referințe datate, se aplică doar versiunea citată. Pentru referințe nedatate, the new version of the applicable reference documents (including any amendment).

ISO 123, Rubber latex – Prelevarea de probe

ISO 124, latex, cauciuc, the determination of total solid content

ISO 1513, vopsele și lacuri – test sample inspection and preparation

ISO 4618, vopsele și lacuri – Termeni și definiții

ISO 15528, Vopsele, lacuri si materii prime pentru vopsele si lacuri — Prelevarea de probe

ISO 3251-2019 “Determinarea compușilor nevolatili în Vopsele, lacuri si materiale plastice”

3 Termeni și definiții
For the purpose of this document, given in the ISO 4618 terms and definitions apply.

ISO și IEC mențin baze de date terminologice pentru standardizare la următoarele adrese:

– Platformă de navigare online ISO: iso.org/obp

– IEC Electropedia: disponibil la electropedia.org/

Doar componenta standard de informații este disponibilă publicului. Pentru a vedea conținutul complet, va trebui să achiziționați standardele prin canale formale.