NF EN ISO 20136

NF EN ISO 20136

July 2020
Standard Current

Leather - Determination of degradability by micro- organisms

This document specifies a test method to determine the degree and rate of aerobic biodegradation of hides and skins of different animal origin, whether they are tanned or not, through the indirect determination of CO2 produced by the degradation of collagen.The test material is exposed to an inoculum (activated sludge from tannery wastewater) in an aqueous medium. If there is not a tannery nearby then urban wastewater can be used as the inoculum.The conditions established in this document correspond to optimum laboratory conditions to achieve the maximum level of biodegradation. However, they might not necessarily correspond to the optimum conditions or maximum level of biodegradation in the natural medium.In general, the experimental procedure covers the determination of the degradation degree and rate of the material under controlled conditions, which allows the analysis of the evolved carbon dioxide produced throughout the test. For this purpose, the testing equipment complies with strict requirements with regard to flow, temperature and agitation control.This method applies to the following materials:? natural polymers of animal stroma (animal tissue/skins);? animal hides and skins tanned (leather) using organic or inorganic tanning agents;? leathers that, under testing conditions, do not inhibit the activity of microorganisms present in the inoculum.

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Main informations

Collections

National standards and national normative documents

Publication date

July 2020

Number of pages

34 p.

Reference

NF EN ISO 20136

ICS Codes

59.140.30   Leather and furs

Classification index

G52-025

Print number

1

International kinship

ISO 20136:2020

European kinship

EN ISO 20136:2020
Sumary
Leather - Determination of degradability by micro- organisms

This document specifies a test method to determine the degree and rate of aerobic biodegradation of hides and skins of different animal origin, whether they are tanned or not, through the indirect determination of CO2 produced by the degradation of collagen.

The test material is exposed to an inoculum (activated sludge from tannery wastewater) in an aqueous medium. If there is not a tannery nearby then urban wastewater can be used as the inoculum.

The conditions established in this document correspond to optimum laboratory conditions to achieve the maximum level of biodegradation. However, they might not necessarily correspond to the optimum conditions or maximum level of biodegradation in the natural medium.

In general, the experimental procedure covers the determination of the degradation degree and rate of the material under controlled conditions, which allows the analysis of the evolved carbon dioxide produced throughout the test. For this purpose, the testing equipment complies with strict requirements with regard to flow, temperature and agitation control.

This method applies to the following materials:

? natural polymers of animal stroma (animal tissue/skins);

? animal hides and skins tanned (leather) using organic or inorganic tanning agents;

? leathers that, under testing conditions, do not inhibit the activity of microorganisms present in the inoculum.

Replaced standards (1)
NF EN ISO 20136
May 2017
Standard Cancelled
Leather - Determination of degradability by micro-organisms

ISO 20136:2017 specifies a test method to determine the degree and rate of aerobic biodegradation of hides and skins of different animal origin, whether they are tanned or not, through the indirect determination of CO2 produced by the degradation of collagen. The test material is exposed to an inoculum (activated sludge from tannery wastewater) in an aqueous medium. The conditions established in this document correspond to optimum laboratory conditions to achieve the maximum level of biodegradation. However, they may not necessarily correspond to the optimum conditions or maximum level of biodegradation in the natural medium. In general, the experimental procedure covers the determination of the degradation degree and rate of the material under controlled conditions, which allows the analysis of the evolved carbon dioxide produced throughout the test. For this purpose, the testing equipment complies with strict requirements with regard to flow, temperature and agitation control. This method applies to the following materials: - natural polymers of animal stroma (animal tissue/skins), - animal hides and skins tanned (leather) using organic or inorganic tanning agents, - leathers that, under testing conditions, do not inhibit the activity of microorganisms present in the inoculum.

Table of contents
  • 1 Domaine d'application
  • 2 Référence normatives
  • 3 Termes et définitions
  • 4 Symboles et termes abrégés
  • 5 Principe
  • 6 Substances chimiques
  • 7 Appareillage et matériel
  • 8 Mode opératoire
  • 9 Quantification
  • 10 Expression des résultats
  • 11 Validité des résultats
  • 12 Rapport d'essai
  • Annexe A Détermination du degré et de la vitesse de dégradation du matériau
  • Annexe B Détermination quantitative de la biodégradation du cuir
  • Annexe C Données comparatives de biodégradabilité utilisant différentes eaux résiduaires de tannerie ou eaux usées
  • Bibliographie
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