{"id":13650,"date":"2026-09-19T19:27:39","date_gmt":"2026-09-19T09:27:39","guid":{"rendered":"https:\/\/anitechgroup.com\/au\/?p=13650"},"modified":"2026-10-14T07:21:52","modified_gmt":"2026-10-13T21:21:52","slug":"peracetic-acid-wel-1-24-mg-m%c2%b3-0-4-ppm-sanitation-segs-not-only-production","status":"publish","type":"post","link":"https:\/\/anitechgroup.com\/au\/blog\/peracetic-acid-wel-1-24-mg-m%c2%b3-0-4-ppm-sanitation-segs-not-only-production\/","title":{"rendered":"Peracetic acid WEL: a 0.4 ppm peak limitation for sanitation SEGs"},"content":{"rendered":"<p>From 1 December 2026, peracetic acid has a Workplace Exposure Limit (WEL) for the first time. Safe Work Australia lists it as a <strong>peak limitation of 0.4 ppm (1.24 mg\/m\u00b3)<\/strong>. The listing has no 8-hour TWA and no STEL.<\/p>\n<p>A peak limitation is the maximum concentration measured over the shortest time possible, not exceeding 15 minutes. In Safe Work Australia&#8217;s words, &#8220;Exposure above the peak limitation is not allowed at any time.&#8221; So the short, open-handling jobs on sanitation shifts are the ones to plan around. A full-shift average can look comfortable while a quick make-up at the day tank goes over the limit.<\/p>\n<h2>When the peak limitation applies<\/h2>\n<p>Until 30 November 2026, the current Workplace Exposure Standards (WES) list remains the compliance reference, and peracetic acid has no entry on it. The WEL list takes over from 1 December 2026, once your jurisdiction&#8217;s WHS regulator gives it effect. Victoria sits outside the model WHS laws, so Victorian sites should check with WorkSafe Victoria on how and when the new list will apply there.<\/p>\n<p>Use the months before December to find out where your peaks are. Nothing about peracetic acid is limited by the WEL list before 1 December.<\/p>\n<h2>Why sanitation SEGs carry this one<\/h2>\n<p>Peracetic acid (PAA) turns up wherever sites sanitise CIP circuits, fillers, aseptic lines and hard surfaces. Risk assessments often describe it as production chemistry on a closed circuit. Meanwhile the people who pour, fog, spray and break containment on sanitation shifts can sit outside the SEG map altogether.<\/p>\n<p>With a peak limitation, those brief moments of open handling are the compliance question. They mostly happen during sanitation and maintenance work, often at night and often done by contractors.<\/p>\n<p>If your register lists hydrogen peroxide or acetic acid but never names peracetic acid in blends, you may already have a naming gap.<\/p>\n<h2>Where peracetic acid shows up<\/h2>\n<p>Typical Australian settings:<\/p>\n<ul>\n<li>Food and beverage CIP: circuit make-up, dosing skids, open sampling of sanitiser tanks<\/li>\n<li>Dairy, brewery, juice and soft-drink filler sanitation between SKUs<\/li>\n<li>Pharma and biotech surface sanitisation by spray or fog<\/li>\n<li>Aseptic packing and clean-room turnaround<\/li>\n<li>Meat and poultry sanitation bays<\/li>\n<li>Contract cleaning crews who apply PAA blends after hours<\/li>\n<li>Drum and IBC decanting into day tanks; filter and pump maintenance on sanitiser lines<\/li>\n<li>Spill response where concentrated stock is handled<\/li>\n<\/ul>\n<p>Vapour and mist matter as much as liquid splash. Open pour, fogging, spray wands and warm CIP return lines are where the highest short-term concentrations tend to occur, even when the production SEG looks tidy.<\/p>\n<h2>SEG walkthrough (beverage CIP example)<\/h2>\n<p>Take a beverage site that makes up PAA sanitiser in a day tank and runs automated CIP on its fillers. Night cleaners then fog floors and walls with a dilute spray.<\/p>\n<p><strong>SEG candidates<\/strong><\/p>\n<ol>\n<li><strong>CIP and dosing operators:<\/strong> make-up, titration sampling, IBC connection<\/li>\n<li><strong>Filler sanitation crew:<\/strong> open spray and wand work at the filler carousel<\/li>\n<li><strong>Night fog and clean team:<\/strong> often contractors, with a different profile from day CIP<\/li>\n<li><strong>Maintenance:<\/strong> pump, filter, valve and gasket work on sanitiser lines<\/li>\n<li><strong>Lab and micro:<\/strong> small-volume handling that still gives off vapour in poorly ventilated rooms<\/li>\n<\/ol>\n<p>For each SEG, write down the moment most likely to give the highest reading. Examples are the IBC coupling, the open sample at the day tank, the start of a fog run and the first valve break after a flush.<\/p>\n<p><strong>Walkthrough questions with ops<\/strong><\/p>\n<ul>\n<li>When in each CIP cycle is the system open, and for how long?<\/li>\n<li>Is make-up done under LEV, outdoors, or in a closed corridor with no capture?<\/li>\n<li>Who fogs after hours, and were they inducted on peracetic acid by name or on &#8220;sanitiser&#8221; in general?<\/li>\n<li>Are stock concentrations and use-dilutions both on the register?<\/li>\n<li>Does anyone treat &#8220;no smell&#8221; as the exposure measure?<\/li>\n<\/ul>\n<p>Build SEGs from those answers. Job titles on the roster won&#8217;t get you there.<\/p>\n<h2>Register and SEG questions for HSE and ops<\/h2>\n<ol>\n<li><strong>Is peracetic acid named on the hazardous chemical register<\/strong>, including in proprietary sanitiser blends?<\/li>\n<li><strong>Which SEGs<\/strong> could inhale vapour or aerosol during make-up, filler spray, fogging, maintenance or lab work?<\/li>\n<li><strong>Are the SDS and emergency procedures<\/strong> current for PAA, including its oxidiser and incompatibility hazards?<\/li>\n<li><strong>Do permits for line-breaking<\/strong> treat vapour release during sanitiser circuit work as foreseeable?<\/li>\n<li><strong>Was any past monitoring full-shift only?<\/strong> If so, it says little about peaks and needs task-level follow-up.<\/li>\n<li><strong>Who owns elimination and substitution<\/strong> before RPE becomes the default for fogging?<\/li>\n<li><strong>Are spill kits and dilution practices<\/strong> compatible with the SDS, and have people practised indoor vapour scenarios?<\/li>\n<li><strong>Do contractors<\/strong> appear in the SEG map with PAA named, rather than buried under &#8220;hygiene chemicals&#8221;?<\/li>\n<\/ol>\n<p>If sanitation is outsourced, the PCBU still needs the substance named and the SEG logic written down.<\/p>\n<h2>Controls for the peak moments<\/h2>\n<h3>Eliminate or substitute<\/h3>\n<ul>\n<li>Can fogging be replaced with closed CIP or wipe systems where efficacy allows?<\/li>\n<li>Can stock strength drop, or make-up move to closed dosing skids?<\/li>\n<li>Can open spray campaigns run less often without losing hygiene outcomes?<\/li>\n<\/ul>\n<p>Write down the residual risk of each alternative so the substitution decision is on record.<\/p>\n<h3>Engineering<\/h3>\n<ul>\n<li>Closed dosing and sealed sampling points<\/li>\n<li>Vapour return where practicable<\/li>\n<li>Local exhaust at make-up points and open spray booths, with capture checked at real spray rates<\/li>\n<li>Gaskets, seals and pump packing on sanitiser circuits maintained as engineering controls<\/li>\n<li>Filter and strainer changes planned so lines are drained and flushed before the break, cutting open volume<\/li>\n<\/ul>\n<h3>Administrative<\/h3>\n<ul>\n<li>Keep open pour and fog dwell time short, with written methods and non-essential people kept clear<\/li>\n<li>Separate sanitation SEGs from production SEGs in training and monitoring plans<\/li>\n<li>Set stop-work triggers for eye or throat irritation, visible mist escape, LEV failure or a direct-reading alarm, without treating odour as a calibrated instrument<\/li>\n<li>Make sure contractor inductions name <strong>peracetic acid<\/strong> and the <strong>0.4 ppm (1.24 mg\/m\u00b3) peak limitation<\/strong><\/li>\n<\/ul>\n<h3>PPE<\/h3>\n<ul>\n<li>Chemical-protective gloves and clothing compatible with PAA (check permeation data)<\/li>\n<li>RPE selected for the vapour and mist hazard at peak concentrations, with fit testing and cartridge or filter change rules<\/li>\n<li>Eye and face protection suited to splash and mist during open spray<\/li>\n<\/ul>\n<p>Storage and segregation matter too. Keep PAA away from incompatibles as the SDS directs, because a tidy chemical store helps prevent unplanned airborne release.<\/p>\n<h2>Monitoring for a peak limitation<\/h2>\n<p>An 8-hour TWA result can&#8217;t show compliance with a peak limitation. A shift average smooths out the very moments the limit is written for. Monitoring should target those moments directly:<\/p>\n<ul>\n<li>Sample the highest-concentration tasks: dosing, CIP make-up, decanting, opening tanks or lines, and fog start-up.<\/li>\n<li>Use short-duration samples and, where a suitable instrument exists, real-time direct-reading monitoring that logs the task as it happens.<\/li>\n<li>Keep sample periods as short as the method allows and never longer than 15 minutes. Ask your occupational hygienist what the shortest practicable period is for the method they propose.<\/li>\n<li>Compare the <strong>highest<\/strong> result with 0.4 ppm. An average across samples is the wrong comparison.<\/li>\n<li>Report in ppm, with mg\/m\u00b3 alongside. SWA says the ppm figure is exact and the mg\/m\u00b3 figure is a guide.<\/li>\n<li>Repeat across sanitation cycles and contractor shifts, since one clean make-up may have been luck.<\/li>\n<\/ul>\n<p>Results collected before December give you a baseline for the 1 December limit. They aren&#8217;t compliance results against a current standard, because the WES has no entry for peracetic acid.<\/p>\n<h2>Common mistakes<\/h2>\n<ul>\n<li>Register lists &#8220;peroxide sanitiser&#8221; but never names peracetic acid<\/li>\n<li>Monitoring production only and skipping night fog and CIP make-up<\/li>\n<li>Running full-shift samples and reading them against 0.4 ppm<\/li>\n<li>Recording 0.4 ppm as a TWA or a STEL on the register or in toolbox talks<\/li>\n<li>Treating odour as either proof of exceedance or proof of safety<\/li>\n<li>Emergency plans that cover skin splash but ignore inhalation during indoor fogging<\/li>\n<\/ul>\n<h2>FAQ for HSE and operations<\/h2>\n<h3>We only fog once a week. Do we still need a SEG?<\/h3>\n<p>Yes, if people can inhale vapour or mist during that programme. A peak limitation applies to every exposure, so a weekly task counts as much as a daily one.<\/p>\n<h3>Is 0.4 ppm the same as 1.24 mg\/m\u00b3?<\/h3>\n<p>They are the same limit in two units. Where a WEL is given in both, SWA treats the ppm figure as exact and the mg\/m\u00b3 figure as a guide.<\/p>\n<h3>Does peracetic acid have a TWA or STEL?<\/h3>\n<p>No. The WEL listing gives a peak limitation only. SWA also notes that a peak limitation can&#8217;t be adjusted for longer or shorter working days, so long sanitation shifts don&#8217;t change it.<\/p>\n<h3>When does the WEL count?<\/h3>\n<p>The WES stays the reference until 30 November 2026. The WEL applies from 1 December 2026 once your jurisdiction&#8217;s WHS regulator gives it effect. Check with your regulator, and in Victoria with WorkSafe Victoria.<\/p>\n<h2>Sources<\/h2>\n<ul>\n<li>Safe Work Australia, <em>Workplace exposure limits for airborne contaminants<\/em> (amended November 2025), PDF: <a href=\"https:\/\/www.safeworkaustralia.gov.au\/sites\/default\/files\/2025-11\/workplace-exposure-limits-amended-november_2025.pdf\">https:\/\/www.safeworkaustralia.gov.au\/sites\/default\/files\/2025-11\/workplace-exposure-limits-amended-november_2025.pdf<\/a><\/li>\n<li>Safe Work Australia, <em>Changes to Workplace Exposure Limits<\/em> (May 2025), PDF: <a href=\"https:\/\/www.safeworkaustralia.gov.au\/sites\/default\/files\/2025-05\/changes_to_workplace_exposure_limits_-_may_2025.pdf\">https:\/\/www.safeworkaustralia.gov.au\/sites\/default\/files\/2025-05\/changes_to_workplace_exposure_limits_-_may_2025.pdf<\/a><\/li>\n<li>Safe Work Australia, <em>Workplace exposure standards for airborne contaminants<\/em> (amended November 2025), PDF: <a href=\"https:\/\/www.safeworkaustralia.gov.au\/sites\/default\/files\/2025-11\/workplace-exposure-standards-amended-november2025.pdf\">https:\/\/www.safeworkaustralia.gov.au\/sites\/default\/files\/2025-11\/workplace-exposure-standards-amended-november2025.pdf<\/a><\/li>\n<\/ul>\n<h2>Next step<\/h2>\n<p>If peracetic acid is used for CIP, fogging, spray sanitisation or make-up on your site, book a consult to map your sanitation SEGs and plan peak monitoring before the WEL date.<\/p>\n<p><strong>Book a consult:<\/strong> <a href=\"https:\/\/anitechgroup.com\">anitechgroup.com<\/a> \u00b7 <strong>sales@anitechgroup.com<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>From 1 December 2026, peracetic acid has a Workplace Exposure Limit (WEL) for the first time. Safe Work Australia lists it as a peak limitation of 0.4 ppm (1.24 mg\/m\u00b3). The listing has no 8-hour TWA and no STEL. A peak limitation is the maximum concentration measured over the shortest time possible, not exceeding 15&#8230;<\/p>\n","protected":false},"author":1,"featured_media":13690,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"ppma_author":[253],"class_list":["post-13650","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Peracetic acid WEL: a 0.4 ppm peak limitation for sanitation SEGs<\/title>\n<meta name=\"description\" content=\"From 1 Dec 2026 peracetic acid has a WEL peak limitation of 0.4 ppm (1.24 mg\/m\u00b3). 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