| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. TEST METHODOLOGY & PREPARATION | |||
| A1 | Chemical analysis method (EDXRF, ICP-OES, Titrimetry per IS 401) Acceptance: Method documented; accredited lab used; procedure per IS 401 Annex | Standardized analytical approach | OK NC NA HOLD |
| A2 | Sample selection (random, representing treated batch) Acceptance: Minimum 5 samples per batch; locations documented; cross-sections taken | Objective sampling | OK NC NA HOLD |
| A3 | Sample preparation (cross-sections, powder preparation, drying) Acceptance: Cross-sections prepared for penetration inspection; powder ground uniformly | Proper sample handling | OK NC NA HOLD |
| A4 | Reference standards and blanks (for chemical verification) Acceptance: Control samples analyzed in parallel; accuracy ±5% of reference | Quality assurance in testing | OK NC NA HOLD |
| B. PENETRATION DEPTH ASSESSMENT | |||
| B1 | Visual inspection of cross-section (color change indicating penetration) Acceptance: Color change visible >3 mm deep on cross-section; uniform throughout | Assess chemical penetration visually | OK NC NA HOLD |
| B2 | Penetration depth measurement (depth of treated zone from surface) Acceptance: Penetration ≥3 mm for sapwood; ≥5 mm for through-and-through treatment | Quantify penetration extent | OK NC NA HOLD |
| B3 | Untreated core detection (heartwood resistance assessment) Acceptance: For resistant species: untreated core acceptable; for permeable: ≤10 mm max | Identify any untreated zones | OK NC NA HOLD |
| C. CHEMICAL RETENTION ANALYSIS | |||
| C1 | Chemical concentration measurement (mg/L or kg/m³) Acceptance: Retention ≥4 kg/m³ for above-ground; ≥6 kg/m³ for ground contact per IS 401 | Quantify preservative content | OK NC NA HOLD |
| C2 | Retention uniformity (variation in retained chemical across samples) Acceptance: Variation ±15% from average acceptable; outliers <10% of batch | Assess preservation consistency | OK NC NA HOLD |
| C3 | Component analysis (if multi-component preservative like CCA) Acceptance: Copper, Chrome, Arsenic ratio within ±10% of specification (CCA type) | Verify all components retained correctly | OK NC NA HOLD |
| C4 | Comparison with supplier specification Acceptance: Measured retention within ±10% of supplier specification | Verify compliance with treatment claim | OK NC NA HOLD |