{"product_id":"bilt-hamber-atom-mac-vapour-phase-corrosion-inhibitor","title":"Bilt Hamber Atom-Mac | Vapour-Phase Corrosion Inhibitor","description":"\u003ch2\u003eA corrosion inhibitor that protects metal it never touches\u003c\/h2\u003e\u003cp\u003eThis is the most interesting chemistry in the Bilt Hamber catalogue, and almost nobody explains it properly.\u003c\/p\u003e\u003cp\u003eAtom-Mac is a \u003cstrong\u003evapour-phase corrosion inhibitor\u003c\/strong\u003e — a VpCI. Bilt Hamber's SDS declares it as an \u003cstrong\u003eamine carboxylate salt at 20–35%\u003c\/strong\u003e, CAS 38344-72-8. That CAS number resolves to \u003cstrong\u003emorpholinium octanoate\u003c\/strong\u003e — the 1:1 salt of octanoic acid and morpholine. It is textbook amine-carboxylate VCI chemistry, and Bilt Hamber declare it openly, which is more than most manufacturers in this category do.\u003c\/p\u003e\u003ch2\u003eHow a vapour-phase inhibitor actually works\u003c\/h2\u003e\u003cp\u003eThe amine carboxylate has enough vapour pressure to volatilise in an enclosed space. The volatile amine \u003cstrong\u003emigrates through the vapour phase\u003c\/strong\u003e, dissolves into the thin film of moisture that's always present on steel, raises the local pH and adsorbs onto the surface. The carboxylate anion then chemisorbs onto the metal and forms a passivating monolayer.\u003c\/p\u003e\u003cp\u003eThe consequence is the useful bit: \u003cstrong\u003eit protects surfaces the liquid never physically reached.\u003c\/strong\u003e The back of a box section. The inside of a seam. The underside of a bolt head. This is why Bilt Hamber tell you to bag or seal the item — you are trying to trap the vapour, not just wet the metal.\u003c\/p\u003e\u003ch2\u003eThe flash-rust problem it solves\u003c\/h2\u003e\u003cp\u003eAnyone who has stripped rust with \u003cstrong\u003eDeox-C\u003c\/strong\u003e or \u003cstrong\u003eDeox-Gel\u003c\/strong\u003e, or wet-blasted a panel, knows the feeling: you now have chemically clean, utterly bare steel, and it will bloom orange within the hour. \u003cstrong\u003eAdd Atom-Mac at 2% to your rinse water\u003c\/strong\u003e and it doesn't. That alone justifies the bottle.\u003c\/p\u003e\u003ch2\u003eDilution\u003c\/h2\u003e\u003cp\u003eDilute in \u003cstrong\u003edeionised or distilled water\u003c\/strong\u003e — Bilt Hamber are specific about this, and tap water minerals will work against you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGeneral use:\u003c\/strong\u003e 2–5%. \u003cstrong\u003eMotorcycles and bicycles:\u003c\/strong\u003e 1–2%. \u003cstrong\u003eCars with disc brakes:\u003c\/strong\u003e 5%. \u003cstrong\u003eEnclosed voids:\u003c\/strong\u003e 2ml of neat product per litre of void volume. \u003cstrong\u003eAfter Deox-C, Deox-Gel or blasting:\u003c\/strong\u003e 2% in the rinse water. \u003cstrong\u003ePressure washer:\u003c\/strong\u003e aim for 2% at the nozzle, applied at the end of every wash.\u003c\/p\u003e\u003cp\u003eIt's water-borne, it's safe on painted surfaces, and the SDS records it at \u003cstrong\u003epH 7\u003c\/strong\u003e — neutral. It carries \u003cstrong\u003eno CLP dangerous classification\u003c\/strong\u003e, though Bilt Hamber advise an A2 or A2-P2 respirator if you're atomising it.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eSafety Data Sheet (Australia)\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0669\/0707\/8878\/files\/Atom-Mac_SDS_au.pdf?v=1784379283\" target=\"_blank\" rel=\"noopener\"\u003eDownload the Bilt Hamber Atom-Mac SDS (PDF)\u003c\/a\u003e\u003c\/p\u003e","brand":"Bilt Hamber","offers":[{"title":"500ml","offer_id":48433207181534,"sku":"BH-AtomMac-500ml","price":69.5,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0669\/0707\/8878\/files\/atom-mac_500ml-scaled.jpg?v=1784179154","url":"https:\/\/www.alphadetails.com.au\/products\/bilt-hamber-atom-mac-vapour-phase-corrosion-inhibitor","provider":"Alpha Details","version":"1.0","type":"link"}