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Key: test item, instrument name, total nonvolatile migration, gravimeter, moisture permeameter

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Loss on Drying & Residue on Evaporation - Modern Instrumental Solution with Automated Water Bath Constant‑Weight Testing

Release time:

2026-06-25

USP<921> Loss on Drying & Residue on Evaporation - Modern Instrumental Solution with Automated Water Bath Constant‑Weight Testing

 

1. What Does USP<921> Require?

USP General Chapter <921> – Loss on Drying​ specifies how to determine volatile content in drugs, excipients, and related materials by:
Drying a pre‑weighed sample​ at a specified temperature (commonly 105 °C)
Weighing at intervals​ until two consecutive weighings do not differ by more than a defined amount (typically 0.3 mg or 0.5 mg)​ — i.e., constant weight
Similarly, Residue on Evaporation / Non‑volatile Matter​ tests (referenced across USP monographs and food contact material standards like 21 CFR & EU 10/2011) require:
Evaporation of solvent on a water bath (≤100 °C)​
Drying residue to constant weight at 105 °C​
Calculating % non‑volatile matter
📌 The key USP concept: "Constant weight" is numerically defined — not a visual or time‑based estimate.

 

2. Common USP <921>/ Residue Tests Pain Points

❌ Manual transfer: water bath → oven → desiccator → balance → back again
❌ Long cycle times (3–5 dry/cool/weigh loops = 2–6 hrs)
❌ Operator dependency in judging "dry enough"
❌ Hard to document for FDA 21 CFR Part 11 / GMP audits​
❌ Balance damage from heat/humidity near ovens

 

3. Instrumented Alternative – LabStone ETR Series

The LabStone ETR Water Bath Evaporation & Constant Weight Tester​ fully supports USP <921>methodology:
 
USP Requirement
ETR Compliance
Water bath evaporation (≤100°C)
✅ Programmable evaporation temp.
Dry at 105°C to constant weight
✅ Drying chamber up to 140°C
≤0.3 mg weight convergence
✅ Auto‑weigh until Δ ≤ set threshold
Reproducible, documented result
✅ Time‑stamped data + audit trail (opt.)
GMP / 21 CFR Part 11
✅ Optional GMP software module
Workflow:​
💧 Water Bath Evaporation → 🔥 High‑Temp Drying → ❄️ Controlled Cooling → ⚖️ Constant‑Temp Weighing (auto‑loop to constant weight)
Typically reaches constant weight in 2 drying cycles
Up to 69 samples in parallel
Optional solvent recovery ≥95%

 

4. Typical USP‑Related Applications

API / Excipient Loss on Drying (USP<921>)​
Packaging extractables – Non‑volatile residue (per USP & FDAguidance)​
Food contact material – Total migration residue (aligned with 21 CFR / EU frameworks)​
Purified water / WFI – Insoluble/non‑volatile matter (pharmacopoeial analog)

 

5. Summary

Replacing manual execution of USP <921>Loss on Drying / Residue on Evaporation​ with a validated, automated constant‑weight system:
✅ Ensures USPmethodological compliance
✅ Improves precision & reproducibility
✅ Cuts analyst time dramatically
✅ Meets modern GMP data‑integrity expectations
LabStone ETR Series — USP‑ready automation for Loss on Drying and Residue on Evaporation testing.

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