| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. TREATMENT DOCUMENTATION REVIEW | |||
| A1 | Treatment certificate from supplier/mill Acceptance: Certificate includes date, chemical, retention rate, pressure method | Verify authorized treatment application | OK NC NA HOLD |
| A2 | Chemical specification and approval (registered wood preservative) Acceptance: Chemical registered with forestry/environmental authority, MSDS available | Verify chemical meets IS requirements | OK NC NA HOLD |
| A3 | Retention rate verification (kg/m³ as per class requirement) Acceptance: Retention ≥4 kg/m³ for above ground, ≥6 kg/m³ for ground contact per IS 401 | Confirm adequate preservative loading | OK NC NA HOLD |
| A4 | Treatment date and aging period (minimum 14 days for CCA) Acceptance: Treatment date recorded; minimum 14-21 days elapsed before site delivery | Verify adequate curing before use | OK NC NA HOLD |
| B. PHYSICAL TREATMENT VERIFICATION | |||
| B1 | Color change/staining indicating chemical penetration Acceptance: Uniform color change (green/brown) typical of CCA; surface uniform without dry spots | Visual confirmation of treatment application | OK NC NA HOLD |
| B2 | Penetration depth check (scraping/cross-section inspection) Acceptance: Chemical color visible >3 mm deep on cross-section; consistent throughout | Verify chemical penetration into wood | OK NC NA HOLD |
| B3 | End-grain and surface coating uniformity Acceptance: End-grain treated (darkened), no untreated wood surface visible, coating uniform | Assess treatment coverage completeness | OK NC NA HOLD |
| B4 | Odor assessment (chemical smell indicating preservative presence) Acceptance: Typical chemical odor present (not objectionable), fading after some time acceptable | Confirm chemical application | OK NC NA HOLD |
| C. LEACHING & DURABILITY ASSESSMENT | |||
| C1 | Moisture content post-treatment (≤18% for structural use) Acceptance: Moisture content 12-18%, no free water; measured with moisture meter | Verify drying after chemical treatment | OK NC NA HOLD |
| C2 | Visual check for leaching or chemical loss (color fading/staining) Acceptance: No excessive color loss or bleeding; chemical retained in wood (some surface fading normal) | Assess chemical stability in timber | OK NC NA HOLD |
| C3 | Accelerated aging test (if high-risk environment specified) Acceptance: If required per spec: samples tested per IS 1141 or EN 84 standards | Verify preservative efficacy under stress | OK NC NA HOLD |