| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. SAMPLE PREPARATION | |||
| A1 | Test samples cut to standard size: 100 x 100 x thickness mm (minimum 3 samples) Acceptance: Sample size 100x100mm; Cut from different areas of batch; Edges trimmed smoothly | Cl. 3 — Sample dimensions | OK NC NA HOLD |
| A2 | All sample surfaces sealed except test surface using waterproof tape or sealant Acceptance: 5 surfaces sealed; Test surface free and clean; Seal applied fully to edges | Cl. 3.1 — Surface preparation | OK NC NA HOLD |
| A3 | Initial dry mass of each sample measured (M0) using calibrated balance ±0.01g Acceptance: Mass measured to ±0.01g; Recorded per sample; 3+ samples minimum; Average calculated | Cl. 4 — Initial mass | OK NC NA HOLD |
| B. TEST SETUP & IMMERSION PROTOCOL | |||
| B1 | Water immersion tank filled with distilled water at 23±2°C Acceptance: Distilled water used; Temperature 23±2°C maintained; Tank clean and suitable | Cl. 5 — Test environment | OK NC NA HOLD |
| B2 | Samples immersed horizontally in water: test surface downward, depth ≥50mm below water surface Acceptance: Samples submerged fully; Test surface down; Depth ≥50mm; No samples overlapping | Cl. 5.1 — Immersion configuration | OK NC NA HOLD |
| B3 | Test duration determined: 24-hour short-term or 28-day long-term as per specification Acceptance: 24h or 28-day test per spec; Start time logged; Duration strictly observed | Cl. 6 — Test duration | OK NC NA HOLD |
| C. MASS MEASUREMENT & MONITORING | |||
| C1 | For 24-hour test: samples removed at 1h, 2h, 4h, 8h, 16h, 24h intervals Acceptance: All time points measured; Times logged accurately; No skipped intervals | Cl. 7 — Interim measurements (short-term) | OK NC NA HOLD |
| C2 | For 28-day test: samples removed and weighed at day 1, 3, 7, 14, 21, 28 Acceptance: All schedule points measured; Days logged; Regular intervals maintained | Cl. 7.1 — Interim measurements (long-term) | OK NC NA HOLD |
| C3 | At each interval: sample surface blotted with cloth to remove excess water; weighed immediately (M) Acceptance: Blotted dry per std; Weighed within 30 sec of removal; Balance ±0.01g precision | Cl. 8 — Weight measurement procedure | OK NC NA HOLD |
| C4 | Sample immediately re-immersed after weighing to maintain test conditions Acceptance: Sample immersed within 1 minute of weighing; Replaced in same position in water | Cl. 8.1 — Re-immersion protocol | OK NC NA HOLD |