While the ISO 12625 series covers multiple properties, Part 6—“Water Absorbency of Tissue Paper by Gravimetric Method”—is the linchpin for any tissue or towel application. This method measures how many grams of liquid a square meter of tissue absorbs over a specified time (commonly 60 s), providing a direct proxy for product usability in hygiene, spill cleanup, and medical applications.
Critical Scenarios for ISO 12625-6 Testing
New Fiber Blends: Benchmark recycled vs. virgin pulp mixes to hit target absorbency (e.g., ≥800 g/m² in 60 s).
Performance Grades: Distinguish “ultra-absorbent” towels from “value” lines with defensible data.
Process Optimization: Correlate creping geometry, lotion add-on, and emboss patterns with absorbency trends.
Supply-Chain QC: Mandate COAs showing absorbency within ±5 % of spec; verify via in-house gravimetric tests on a rolling basis.
Best Practices
Condition specimens per ISO 187 (23 °C/50 % RH) for 24 h.
Use deionized water and precise 100 cm² rings.
Report mean of five replicates with standard deviation.
Track absorbency control charts and trigger CAPA when trending toward limits.
