substrate
5lb Fortified Masters Mix
Masters Mix
substrate
substrate
5lb Fortified Masters Mix
$28.00
Our flagship substrate block uses a 1:1 hardwood pellet to soy hull base, fortified with gypsum (CaSO4*2H2O) and calcium carbonate (CaCO3), then hydrated to 60%. Each batch is sterilized at 118.3°C @ 15 PSI for an elevation-adjusted 229-minute cycle in Longmont (4,984 ft), with lethality validated to F₀ ≥ 120. Every bag is assigned a Batch ID and linked to a Digital Birth Certificate.
NET WEIGHT
5 lb / 2.27 kg
COMPOSITION
Hardwood Pellets + Soy Hulls (1:1)
FORTIFICATION
Gypsum (CaSO4*2H2O) + Calcium Carbonate (CaCO3)
BATCH FORMULA
450g hardwood + 450g soy + 10g CaSO4*2H2O + 10g CaCO3 + 1350g water
HYDRATION
60%
STERILIZATION TEMP
118.3°C @ 15 PSI
STERILIZATION HOLD
229 minutes (elevation-adjusted)
F₀ LETHALITY
≥ 120
ALTITUDE
4,984 ft (Longmont, CO)
BATCH SIZE
4 units per batch
MIN VIABLE QA HOLD (78–82°F INCUBATION)
5 days
Every Unit Ships With
- ✓1× Sterile substrate block (heat-sealed polypropylene bag w/ .5-micron filter patch)
- ✓1× Physical Manifest Card
- ✓1× pH test strip affixed to Manifest Card
- ✓Batch ID + QR code linking to Digital Birth Certificate
Digital Birth Certificate
Every unit ships with a Manifest Card carrying a QR code. Scan the QR code or navigate directly to /batch/[BATCH-ID] to access the thermal integration log, F₀ lethality value, sterilization parameters, and the name of the operator who signed off on your batch. This data is immutable once published.
Batch Evidence Access
Use your shipped Batch ID to open the exact certificate at /batch/[BATCH-ID]. Public ledger entries are available below.
Example certificate shortcut links are coming soon after the first approved public reference set is finalized.
Validation Links
Altitude Compensation — 4,984 ft
Our sterilization parameters are explicitly compensated for our operating altitude. At 4,984 ft, 15 PSI autoclave pressure yields 118.3°C — not 121°C. We run a product-specific hold window validated to F₀ ≥ 120. Sea-level timing assumptions applied at elevation produce inadequate lethality.
Dense, high-hydration substrate requires extended lethality planning to ensure core-mass sterilization at elevation.
Species Compatibility
Best For
Masters Mix performs best with wood-loving species that benefit from a supplemented hardwood base. Lion's Mane and Shiitake show particularly vigorous colonization on this substrate, often clearing the block within 10–14 days at 72–78°F. The gypsum and CaCO3 buffering maintains a stable pH range throughout the fruiting cycle, which is critical for species with high metabolic output.
Notify Me — 5lb Fortified Masters Mix
Get a release notification when the next validated batch of this product clears QA. No newsletters. Notification only.
Customer Reviews and Feedback
Customer Reviews
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