PhazePak (PCM)
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Heat Pack
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How It Works
Stay in Range, End-to-End
PhazeLock combines two simple ideas for rock-steady shipping temps: PhazePak (PCM gel) holds a target range, and Heat Packs add gentle warmth when outside air drops. Used together, they buffer swings, bridge hand-offs, and keep your box in the safe zone from pickup to delivery. Choose what you want to learn:
PhazePak + Heat Pack: The Stable-Temp Combo
Pairing PhazePak (PCM gel, 23 °C / 73 °F) with a Heat Pack gives your box both a gentle heat source and a smart temperature buffer. The heat pack adds warmth when outside air drops; the PCM absorbs or releases heat at its set point to smooth spikes and dips. PhazeLock’s position is simple: PCMs aren’t optional when using heat (or cold) packs—they’re essential for safe, stable transit.
Why Pair PhazePaks With Heat Packs?
PCMs act like a thermostat + flywheel. Heat packs can run a little hot at first and taper later; delays add swings. The PCM absorbs excess heat and releases it later, keeping contents closer to target range.
- Cold night (≈30 °F / −1 °C): heat pack warms, PCM releases heat → box hovers ~65–75 °F.
- Hot lane or truck hold (≈90 °F / 32 °C): PCM absorbs heat → box stays below ~78 °F.
Bottom line: Heat pack = heater. PhazePak = thermostat + buffer. Use both.
Setup & Pack-Out (Best Practices)
PhazeLock Preconditioning Rule for 23 °C (73 °F) PhazePak
Always precondition to full liquid (for warm lanes) or full solid (for hot lanes).
- To liquid: hold > 75 °F (24 °C) until fully melted.
- To solid: hold < 60 °F (16 °C) or freeze for hot-weather shipping.
PhazePak (PCM Gel Pack) — How it works
A sealed pouch filled with a form-stable PCM gel. It’s designed for cold-chain use and built to be leak-resistant, even as it cycles through phases. Available set-point options commonly include ~3 °C, 18 °C, 23 °C, and 26 °C so you can match the pack to your target shipping range.
The Science In One Paragraph
Phase-change materials (PCMs) absorb or release heat at a specific temperature (their “set point”). When your shipment gets warmer than that set point, the pack absorbs heat; when it gets cooler, the pack releases heat—buffering temperature swings around that set point using the material’s latent heat.
PCMs are “thermal batteries” that stabilize temperature during shipping. As they switch physical state (solid ⇄ liquid) near a set temperature—like 23 °C / 73 °F—they store or release large amounts of energy. That keeps the air inside your box steady, even when outside temps spike or drop.
Why PhazePak Keeps Boxes Stable
- Fixed temperature choices let you hold near a target range instead of 0 °C like ice. (Example: a pack near 18–26 °C helps buffer “room-temp” lanes.)
- Form-stable gel + macro-encapsulated pouch design = durable, leak-resistant element that’s practical for shipping sensitive goods.
Heat Pack — How it works
An air-activated warmer that gives off gentle, steady heat inside a shipping box. It’s sealed until use, lightweight, and made from common, safe ingredients.
The Simple Science
When you open the outer wrapper and the pouch meets air, oxygen starts a controlled reaction with the iron. The charcoal spreads heat, water and salt regulate the rate, and vermiculite helps hold moisture. The result is exothermic heat (think “slow rusting”) that keeps the box warm.
Inside The Pouch
Iron powder · activated charcoal · water · salt · vermiculite · cellulose (binder)
How To Activate (Quick Start)
- Open & expose to air. Remove the heat pack from its plastic wrapper.
- Shake gently. This mixes the ingredients and starts airflow inside the pouch.
- Pre-warm. Let the pack build heat per the label (typically 20–60 minutes).
- Place correctly. Put the pack outside any animal/food/pharma container, with a paper or cardboard barrier; don’t place directly against delicate items.
Tip: Position the heat pack so that the “Red Stripe” breathing holes face inward toward the center of the inner box, not against the sides or top.
