| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. TEST PREPARATION & METHODOLOGY | |||
| A1 | Sample selection and documentation Acceptance: Minimum 5 tiles per batch, random selection, tile identification recorded | Representative sampling from project material batch | OK NC NA HOLD |
| A2 | Initial drying of test samples (24 hrs at 110±5°C) Acceptance: Samples dried at 110°C for 24 hrs, cooled in desiccator, initial weight recorded | Remove surface moisture before weighing | OK NC NA HOLD |
| A3 | Balance calibration (accuracy ±0.1 g minimum) Acceptance: Balance certified calibrated within 6 months, used for all measurements | Accurate measurement of tile weight change | OK NC NA HOLD |
| A4 | Immersion tank preparation (distilled water at 20±5°C) Acceptance: Distilled water used, temperature maintained 20±5°C throughout test | Standard testing environment for valid results | OK NC NA HOLD |
| B. WATER IMMERSION & WEIGHT MEASUREMENT | |||
| B1 | Cold water immersion (24 hrs ±1 hr at 20±5°C) Acceptance: Tiles fully immersed for exactly 24 hrs, temperature monitored hourly | Standard immersion time for water absorption assessment | OK NC NA HOLD |
| B2 | Wet weight measurement (after removing excess surface water) Acceptance: Surface dried with cloth, weighed immediately, recorded to 0.1 g precision | Accurate determination of water absorption | OK NC NA HOLD |
| B3 | Boiling immersion (if required for porous tiles, 5 hrs boiling + 24 hrs cold water) Acceptance: If applicable per specification: boil for 5 hrs, cool to 20°C, re-immerse 24 hrs | Extended test for tiles with higher porosity | OK NC NA HOLD |
| B4 | Final dry weight (re-dried at 110±5°C until constant weight) Acceptance: Final dry weight within 0.1 g of initial weight; confirms no tile damage | Verify initial dry weight consistency | OK NC NA HOLD |
| C. CALCULATIONS & RESULTS | |||
| C1 | Water absorption percentage calculation (Aw = (Msat - Mdry)/Mdry × 100) Acceptance: Aw ≤ 10% for vitrified tiles, ≤ 20% for ceramic, ≤ 15% for concrete tiles | Quantify water absorption capacity | OK NC NA HOLD |
| C2 | Average water absorption from all samples Acceptance: Average Aw within specification limits; variation between samples ≤2% | Summary metric for tile batch compliance | OK NC NA HOLD |
| C3 | Classification per absorption category (AI, AII, AIII, AIV) Acceptance: Tiles classified: AI (≤0.5%), AII (0.5-3%), AIII (3-10%), AIV (>10%); documented | Standard tile classification per ISO 10545-3 | OK NC NA HOLD |
| C4 | Suitability for application (wet vs. dry areas) Acceptance: Low absorption (AI-AII) for wet areas; higher absorption acceptable for dry indoor | Ensure tiles suitable for intended location | OK NC NA HOLD |