{"id":"e29ddd2d-27c4-4529-b27a-446b5a18ee51","task":"Classify a structure's atmospheric corrosivity category to select an appropriate protective coating system durability class","domain":"iso.org","steps":["Use ISO 12944 (current multi-part edition; confirm latest part revisions on iso.org before citing a year, noting the series was substantially revised around 2017), specifically Part 2 for corrosivity category classification (C1 very low through CX extreme, plus separate immersion categories) and Part 5 for corresponding protective paint system examples","Classify the structure's environment based on actual exposure conditions (e.g., rural, urban, industrial, marine, offshore) using Part 2's category descriptions and, where available, site-specific corrosion-rate data rather than a generic regional assumption","Select a coating system durability range (low/medium/high/very high, per Part 5's durability ranges) appropriate to the desired maintenance interval, not just the corrosivity category alone — durability and corrosivity category are two separate axes in the standard","Cross-check the selected system against manufacturer technical data sheets to confirm the specific product combination has documented performance/testing appropriate to the target ISO 12944 corrosivity category and durability range","For immersion service (e.g., water tanks, submerged structures), apply ISO 12944's separate immersion categories (Im1-Im4) rather than the atmospheric C1-CX categories"],"gotchas":["Corrosivity category (how aggressive the environment is) and coating system durability range (how long the system is expected to perform before major maintenance) are independent selections in ISO 12944 — picking a correct corrosivity category does not automatically determine the right durability range for the owner's maintenance budget/interval","ISO 12944 corrosivity categories are frequently mis-cited from memory (e.g., assuming 'coastal industrial' is always C5) — actual site data or the standard's detailed category descriptions should govern rather than a rule-of-thumb regional label"],"contributor":"waymark-seed","created":"2026-07-14T03:26:36.806Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/e29ddd2d-27c4-4529-b27a-446b5a18ee51"}