{"product_id":"mangrove-jacks-beer-yeast-new-world-strong-ale-m42","title":"Mangrove Jacks M42 New World Strong Ale Yeast 10g","description":"\u003cp\u003eM42 is built for high-gravity beers — specifically beers that push past 8% ABV where standard ale yeasts stall or produce harsh fusel alcohols. Its very high alcohol tolerance and clean neutral profile make it the right choice for barleywines, imperial stouts, and double IPAs.\u003c\/p\u003e \u003cp\u003e\u003cb\u003eBest Suited To\u003c\/b\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eBarleywine, Imperial Stout, Double IPA, Triple IPA\u003c\/li\u003e \u003cli\u003eStrong Ale, Wee Heavy\u003c\/li\u003e \u003cli\u003eAny beer targeting above 8% ABV where fermentation stress is a risk\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cb\u003eSpecs\u003c\/b\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cstrong\u003eFermentation temp:\u003c\/strong\u003e 16–22°C (lower end for cleaner high-gravity fermentation)\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eAttenuation:\u003c\/strong\u003e High\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eFlocculation:\u003c\/strong\u003e High\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eAlcohol tolerance:\u003c\/strong\u003e 14%+ ABV\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003ePitching rate:\u003c\/strong\u003e 2 sachets per 23L for beers above 1.080 OG; add yeast nutrient\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cb\u003eWhen to Choose M42\u003c\/b\u003e\u003c\/p\u003e \u003cp\u003eChoose M42 when your target OG is above 1.080 or target ABV is above 8%. Standard ale yeasts — US-05, M44, M15 — can stall or produce fusel alcohols in strong beers. M42 is designed for this range.\u003c\/p\u003e \u003cp\u003eFor standard-gravity beers (under 1.060), use a more expressive strain. M42's strength is alcohol tolerance, not flavour character — a neutral yeast is wasted on a session ale.\u003c\/p\u003e \u003cp\u003e\u003cb\u003ePractical Notes\u003c\/b\u003e\u003c\/p\u003e \u003cp\u003eTwo sachets per 23L is the correct pitch rate for beers above 1.080 OG. Under-pitching at high gravity is the most common cause of fusel alcohol production and stuck fermentation — do not save money here.\u003c\/p\u003e \u003cp\u003eAdd yeast nutrient to the wort before pitching. High-gravity wort is fermentation-stressful; nutrients help M42 work cleanly through to full attenuation.\u003c\/p\u003e \u003cp\u003eFerment at 16–18°C to minimise fusel production. For very high-gravity beers above 1.100 OG, oxygenate well before pitching.\u003c\/p\u003e \u003cp\u003eKeep refrigerated. Once opened, reseal and use within 7 days.\u003c\/p\u003e \u003cp\u003e\u003cem\u003eReviewed by the AHB Brewing Team — June 2026.\u003c\/em\u003e\u003c\/p\u003e","brand":"Mangrove Jack's","offers":[{"title":"Default Title","offer_id":41994560667725,"sku":"25008","price":9.5,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8306\/0045\/files\/25008.jpg?v=1754053136","url":"https:\/\/www.australianhomebrewing.com.au\/products\/mangrove-jacks-beer-yeast-new-world-strong-ale-m42","provider":"Australian Home Brewing","version":"1.0","type":"link"}