Overall Migration & Non-Volatile Residue Constant Weight Tester
Automates the full water-bath evaporation, drying, cooling and constant-temperature weighing cycle in one…
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LabStone
Constant Weight & Packaging Testing Technology Leader
Founded in 2007 at the Science Park of South China University of Technology, LabStone Technology Co., Ltd. specialises in packaging and material testing technology, committed to quality control across medical, pharmaceutical, food, packaging, textile and new-material industries. Anchored by South China University of Technology, the company counts three professors/associate professors among its staff, alongside numerous PhD and Master's graduates, with over 95% holding a tertiary qualification. Our capabilities in constant weight determination, material barrier testing, trace moisture detection and humidity control are internationally advanced.
2007Founded
24Product models
40+Export destinations
24hTechnical response
Product Categories
Product Categories
Balance-based gravimetric automation that replaces water baths, drying ovens, muffle furnaces and vacuum ovens — plus repeated manual weighing — for total migration, non-volatile residue, evaporation residue, loss on drying, moisture, ignition residue, ash and loss on ignition.
CO
Constant Weight Testers
Automatic Constant Weight Systems
3 models PEBarrier Property Testers
WVTR / GTR / OTR Testers
6 models SESeal & Leak Testers
Leak, Package Integrity, Burst & Torque Testers
4 models PAPackaging Testing Instruments
Mechanical, Thermal & Impact Testers
5 models DVMoisture Sorption Analysers
Dynamic Vapour Sorption Analyser
1 models STStability Test Chambers
Constant Climate & Drug Stability Chambers
1 models MODew Point & Trace Moisture Analysers
Dew Point Meters & Trace Moisture Testers
2 models SHSharpness Testers
Knife & Medical Needle Sharpness Testers
4 models
Products
Featured Instruments
Ignition Residue & Ash Determination Instrument
Muffle furnace, drying oven, desiccator and balance in one cabinet — automated ignition to constant weight at…
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Water Vapor Transmission Rate Tester – Gravimetric (Cup) Method
The gravimetric cup method closest to the pharmacopoeia and ASTM E96 classic: 1–12 test stations, testing…
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Water Vapor Transmission Rate Tester – Infrared (TDLAS) Method
Wavelength-modulated tunable diode laser absorption spectroscopy (TDLAS) with a 20 m ultra-long optical path…
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Oxygen Transmission Rate Tester – Coulometric Sensor Method
A coulometric sensor dedicated to oxygen, with a film lower limit of 0.01 cm³/m²·24h·0.1MPa and a container…
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Packaging Integrity Tester – Vacuum Decay Method
Measures leak rate and leak aperture of flexible and rigid packs without destroying the sample: detectable…
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Why LabStone
Why LabStone
Automation instead of manual work
Hand the repeated dry–cool–weigh constant weight loop to the instrument: 2–3 days of manual work becomes one button.
Standards compliance and traceability
Every instrument lists its ASTM / ISO / GB / YBB / pharmacopoeia standards, and the software supports audit trails.
International-brand core components
Analytical balances, sensors and pneumatics come from international brands — globally sourced, low maintenance cost.
24-hour response
Technical enquiries answered within 24 hours, 12-month warranty, lifetime maintenance and IQ/OQ/PQ support.
Industries We Serve
Industries We Serve
What You Can Test
What You Can Test
- Overall migration and non-volatile residue
- Loss on drying and moisture / water content
- Ignition residue, ash and loss on ignition (LOI)
- Water vapour transmission rate WVTR (gravimetric / infrared / electrolytic)
- Gas transmission rate GTR (differential pressure) and oxygen transmission rate OTR (coulometric)
- Package sealing and integrity (vacuum decay)
- Tensile, peel, tear and coefficient of friction
- Seal strength, thermal shrinkage and hot tack