SIST EN ISO 9073-8:2025 – Required Testing Instruments

SIST EN ISO 9073-8:2025, titled “Nonwovens – Test methods – Part 8: Determination of liquid strike-through time (simulated urine) for nonwoven coverstocks”, specifies a method for measuring the time taken for a liquid (simulated urine) to penetrate nonwoven coverstocks. The method is intended for laboratory comparison of different nonwoven materials and does not simulate real-use conditions of finished hygiene products.

Test Principle

The test involves dispensing a fixed volume of simulated urine onto a nonwoven specimen placed above a reference absorbent pad. The time until the liquid passes completely through the specimen is measured electronically using corrosion-resistant electrodes embedded in a transparent strike-through plate.

Specimen Preparation

(1) Nonwoven coverstock specimens sized 125 mm × 125 mm.

(2) Conditioned under standard laboratory atmosphere (ISO 139).

(3) Test performed in at least 10 replicates for statistical reliability.

Required Instruments

(1) Burette or Dispensing System – For precise delivery of 5 ml simulated urine at a controlled rate.

(2) Magnetic-Valve Funnel or Automated Delivery System – Ensures uniform and reproducible liquid application.

(3) Acrylic Strike-Through Plate with Embedded Electrodes – Transparent plate with corrosion-resistant electrodes to detect liquid penetration.

(4) Ring Stand and Base Plate – Provides stable support for the strike-through plate and specimen.

(5) Electronic Timer / Stopwatch – High-sensitivity timing device (0.01 s resolution) to record strike-through time.

(6) Reference Absorbent Pads – Multi-layer filter papers to standardize liquid absorption beneath the specimen.

(7) Press Knife / Cutting Tools – For preparing precise specimen dimensions according to the standard.

(8) Analytical Balance – Optional, for verifying specimen mass or uniformity (resolution 0.001 g).

Materials and Reagents

(1) Simulated Urine Solution – Sodium chloride solution with controlled surface tension (~70 mN/m) to mimic human urine. Surfactants may be added for tension adjustment; usage must be reported.

(2) Laboratory-Grade Water – Distilled or deionized water (ISO 3696 Grade 3) for preparing simulated urine and cleaning equipment.

(5) Data Reporting Requirements

(1) Report mean strike-through time and coefficient of variation for each specimen batch.

(2) Include all relevant parameters: deviations, specimen size, number of replicates, conditioning conditions, and any surfactant usage.

(3) Reference SIST EN ISO 9073-8:2025 in the report.

Applications

(1) Hygiene Product Development – Critical for manufacturers of diapers, sanitary pads, and incontinence products.

(2) Quality Control & Material Comparison – Supports objective evaluation of nonwoven coverstocks for liquid barrier performance.

(3) Research & Innovation – Enables testing of new fibers, finishes, or composites to improve liquid strike-through resistance.

(4) Standards Compliance – Provides verifiable test data aligned with ISO and CEN requirements.

Related Standards

(1) ISO 139 – Standard atmospheres for conditioning textiles.

(2) ISO 186 – Sampling methods for paper, board, and nonwovens.

(3) ISO 3696 – Water quality for analytical laboratory use.

(4) EN ISO 9073 Series – Other test methods for nonwoven physical properties (tensile, permeability, etc.).

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2026-01-06 17:08