Working guidanceWe run this. It has produced results under the conditions stated on this page. · The full position record
190°F / 60-Minute Mash Baseline: Evidence and Optimization
Watch on YouTubeWhy 190°F for 60 MinutesWhere the baseline came from, and why it's a floor rather than a tradition. AI-generated from this page and reviewed for accuracy.
Why we take this position
Position. Run the hot-liquefaction hold at 190°F (88°C) for 60 minutes. Validate anything lighter on your own malt and equipment across several batches and more than one lot before you adopt it.
Basis. Commercial gluten-free production experience and engineering judgment. Adopted in November 2019 on the enzyme distributor's recommendation and kept because it worked — the sequence is stated under Why GFB selected it. This is a selected working baseline, not a biochemical minimum and not doctrine.
Why. Sorghum malt does not release its starch on schedule, and liquefaction has to work so that conversion and runoff can. A hot, long hold carries operating margin, and margin is what absorbs malt-lot and crop-year variation, equipment and mixing differences, measurement error, and scale. The baseline was chosen to keep working when conditions drift, not to be the lowest setting that works once. Why GFB selected it gives the full reasoning.
The problem forcing it. Sorghum malt starch access and lot-to-lot behavior are variable and not characterized well enough to set a tighter process against — so the hold is sized to cover the variation rather than to match a known requirement.
Compensation or ideal? A compensation. The 60 minutes is production insurance: 30 minutes has been sufficient in most runs. The ideal is a malt characterized well enough, and a floor established well enough across lots, that the hold can be set to what conversion actually needs with the margin stated rather than assumed.
Evidence.
- Four separate internal production-protocol records using the 190°F / 60-minute hold — commercial experience, the primary basis.1
- Two outside-brewery trials in which the baseline ran successfully at contract breweries beyond the environment where it was developed — evidence that it transfers.2
- Highly reliable across Bard's production — a commercial-experience judgment, not a measured rate.
- Limiting evidence: a 30-minute hold worked in most runs. The 60-minute figure is margin, not a requirement.
- Not held: a controlled comparison across batches and malt lots establishing where the temperature or time floor actually is. What it does not establish lists the rest.
Open contradictions. None recorded as unresolved. The Cereal Decoction and The Maltose Mash are different processes, not contradicting evidence on this one.
What would change our position. Controlled alternatives — lower temperature, shorter hold, or both — repeated across multiple batches and multiple malt lots, judged on liquefaction, viscosity, iodine, extract, runoff, fermentation, and repeatability. That result would lower or shorten the published baseline. A change in enzyme product, or contradictory production evidence, reopens it as well. One clean batch does not.
Related research asks.
- Ask 7 — How far can the 190°F baseline come down? — the question this position points at.
- Ask 3 — the Reliable Mash at homebrew scale
- Ask 4 — the Maltose Mash against the Reliable Mash
Commercial interests. None. We hold no financial interest in any enzyme, equipment, or malt product this baseline depends on.
Consequence if wrong. Process. A hold hotter or longer than needed costs energy and time; a hold too light on a variable lot costs a batch.
Decision owner and status. Craig Belser · Current · baseline governed July 2026 · last reviewed August 2026.
History. July 2026: the reliability wording was corrected from "worked 100% of the time" to "highly reliable in commercial experience" — the former was engineering judgment stated as a measured rate. The baseline values did not change.
This page carries the reasoning and evidence. It does not repeat the procedure — for the exact temperatures, times, enzymes, doses, pH, and mineral targets, use The Reliable Mash.
Why GFB selected it
The number arrived from outside, and the reasoning came after. On 10 November 2019 the enzyme distributor's technical contact recommended taking the mash to 190°F and running "a true cook" with a 60-minute hold; the production protocol adopted it two days later, switched the alpha-amylase product two days after that with the hold unchanged, and has run on it since. Nothing in the archive shows the gelatinization rationale below preceding that recommendation — it's the explanation we built afterwards, from the results and from the literature. That is not a weakness. A number that came from outside, was adopted in two days, and then survived every production run and two contract breweries is a tested number, which is more than a number derived at a desk can say. (Sequence read first-hand from the November 2019 correspondence; the distributor and its contact are not named, per the site's attribution rules.)
Sorghum malt does not hand you its starch on schedule, and one stage can't be assumed to carry another: starch access, liquefaction, viscosity, conversion, and runoff have to work as one system. In Bard's process, the hotter, longer liquefaction step reliably opened the starch so the downstream stages had a fair chance.
The goal was never the lowest temperature or the shortest hold that works once — it was a process repeatable across variable malt, equipment, and production scale. A conservative liquefaction step carries operating margin, and margin is what absorbs malt-lot and crop-year variation, equipment and mixing differences, ordinary measurement error, and changes in scale. A setting that barely works when everything is perfect is not a baseline; a setting that keeps working when conditions drift is.
What the evidence supports
- Four separate internal production-protocol records use the 190°F / 60-minute hold.
- Two outside-brewery trials. The baseline ran successfully at contract breweries beyond the environment where it was developed — real evidence that it transfers.
- Highly reliable in commercial experience. Across Bard's production the baseline was highly reliable. That's a commercial-experience judgment, not a measured guarantee.
Together, that is strong, honest commercial evidence for a starting point brewers can trust.
Provenance. This page describes a selected Gluten Free Brewer working baseline developed from Bard's commercial gluten-free brewing experience and engineering judgment, supported by internal production-protocol records and trials at anonymized outside contract breweries. It is a working baseline, not a controlled scientific proof of a universal optimum.
What it does not establish
This is commercial evidence, not a controlled scientific study. It does not establish that 190°F is chemically required in every system, that 60 minutes is the shortest workable hold, or that lower-temperature or shorter methods cannot work. It also does not establish that every malt lot or enzyme system requires identical treatment. One successful alternative batch does not prove a transferable process. The baseline is a reliable place to start, not a verdict on every other method.
Validating an alternative
A lighter process is a different process, and it earns baseline status the same way this one did — by repeating across more than one batch and more than one malt lot. Before you trust it, confirm:
- Liquefaction happened — the mash thinned and became workable.
- Viscosity dropped and mixer or agitator load stayed manageable.
- Iodine response is clean, with no visible residual starch on the grain.
- Extract or gravity hit target.
- Runoff was normal — reasonable rate, no stuck bed.
- Fermentation performance matched intent and finished-beer flavor held up.
- Repeatability — the result held across batches and survived a new malt lot.
One clean batch is encouraging. It is not a baseline.
One archived sheet ran shorter. The V12 run sheet from a 2020 production run liquefied at 190°F for 45 minutes, and the Maltose Mash publishes it at that figure on purpose. One sheet, one system, one lot: evidence toward the floor question in Ask 7, and no change to this baseline.
The research opportunity
The useful question is how far the temperature, the hold time, or both can be reduced while preserving liquefaction, viscosity control, extract, runoff, fermentation performance, finished-beer quality, and repeatability across malt lots and equipment. A useful study compares controlled alternatives across multiple batches and malt lots, rather than treating one successful batch as proof.