Test method and evaluation for flushability of disposable sanitary nonwoven materials
1 Scope
This standard specifies the test method and evaluation for flushability of disposable sanitary nonwovens, including eight test and evaluation methods, including wet breaking strength pre-test, toilet and drain-line clearance test, slosh box disintegration test, household pump test, settling test, aerobic biodisintegration/biodegradation tests, anaerobic biodisintegration/biodegradationtests and municipal sewage pump test.
This standard is applicable to disposable sanitary nonwovens that can be disintegrated and degraded directly into toilets, including dry/wet wipes for infants, dry/wet wipes for women's care, dry/wet wipes for toilets, etc.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 20810-2018 Toilet tissue paper (including toilet tissue base paper)
GB/T 21856 Chemicals - Ready biodegradability - CO2 evolution test
GB/T 24218.3 Textiles - Test methods for nonwovens - Part 3: Determination of tensile strength and elongation (strip method)
GB/T 27857 Chemicals - Anaerobic biodegradability of organic compounds in digested sludge - By measurement of gas production
GB/T 31216 Complete pet food - Dog food
CJ/T 51-2018 Examination methods for municipal sewage
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
flushability
performance of the product that can maintain the smoothness of the toilet and drain-line system under expected usage conditions, be compatible with existing sewage transportation, treatment, reuse, and disposal systems, make waste unrecognizable in a reasonable time, and have disintegrating and degradation ability
3.2
simulated fecal material; SFM
material used to simulate human feces in flushability tests
3.3
total suspended solids; TSS
total suspended solids in untreated sewage or activated sludge
3.4
total solids; TS
total solid mass left by evaporation of anaerobic digested sludge to dryness, which is the sum of dissolved solids and insoluble solids in anaerobic sludge
4 General principles
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General principles
5 Wet breaking strength pre-test
6 Toilet and drain-line clearance test
7 Slosh box disintegration test
8 Household pump test
9 Settling test
10 Aerobic biodisintegration/biodegradation tests
11 Anaerobic biodisintegration/biodegradation tests
12 Municipal sewage pump test
13 Comprehensive evaluation
Annex A (Normative) Preparation method of simulated fecal material
Annex B (Normative) Weighing of dry weight of test samples and residual samples
Annex C (Normative) Sample pre-cleaning
Annex D (Normative) Screening and collection of residual samples
Annex E (Normative) Collection, transportation, storage, characteristic description and preparation of sewage and sludge
