Abstract
The HST-XNR-400DT is a touch screen display Melt Flow Indexer that reports both MFR and MVR from one extrusion run: a 0.1-800.00 g/10min (MFR) and 0.1-800.00 cm3/10min (MVR) measuring range, a barrel from room temperature to 450deg C held at ±0.2deg C, eight gravity load grades from 0.325 to 21.600 kg, automatic or manual material cutting, and a printer for the test report. It is built for the GB/T 3682-2000, ISO 1133:1997 and ASTM D1238 methods, and suits plastics production, plastic products, the petrochemical industry and teaching labs - from commodity polyethylene and polypropylene to high-temperature polycarbonate, nylon and fluoroplastics.
https://www.hssdgroup.com/uploads/image/20261023/20261023183018_46691.jpgKey Takeaways
- One run, two values: the touch screen shows the MFR result (g/10min) and the MVR result (cm3/10min) side by side, so a resin lot is characterized on both a mass and a volume basis.
- The 0.1-800.00 g/10min range covers stiff, high-viscosity engineering grades at the low end and free-flowing resins at the high end on the same machine.
- The barrel reaches room temperature to 450deg C with ±0.2deg C control accuracy and 0.1deg C resolution - enough for polycarbonate, aromatic sulfone, fluoroplastics and nylon.
- Eight standard gravity loads, 0.325 kg up to 21.600 kg, with a load test relative error of 0.5% or less.
- Cutting is automatic or manual; the interval timer runs 0.01-99.99s or 1-9999s at 0.1s accuracy.
- Reports print directly from the built-in printer; the whole unit runs on an ordinary 220V 50Hz lab circuit.
What the HST-XNR-400DT is for
Melt flow testing measures how a thermoplastic flows in the viscous state under a defined temperature and load, normalized to a 10-minute basis. That single number - the melt flow rate - is the most quoted lot-to-lot consistency check in plastics, and the MVR is its volume-based twin.
- Commodity resins: polyethylene (PE), polypropylene (PP), polystyrene (PS), ABS, polyoxymethylene (POM) and polycarbonate (PC) grades that melt at the lower end of the scale.
- High-temperature materials: polycarbonate, aromatic sulfone, fluoroplastics and nylon engineering plastics, which is why the barrel runs to 450deg C.
- Compounders and fillers: glass fiber plastic and other modified resins, where the melt flow number tracks how much the reinforcement changes processability.
- Industry fit: plastic production lines, plastic product manufacturers, the petrochemical industry and colleges and universities that need the method in a teaching lab.
Why one test, two values matters
MFR (g/10min) says how much mass passes the die; MVR (cm3/10min) says what volume that mass occupies. The two numbers only match when density is fixed - and it is not, once you move between polymers or blend in fillers.
- For lot acceptance inside one resin family, MFR is the number buyers quote; the XNR-400DT computes it from the timed extrudate.
- For comparing across resins or tracking a blend recipe, MVR expresses the same flow as a volume, so density differences between resins no longer skew the comparison - that is why the spec sheet lists both ranges at the same 0.1-800.00 scale.
- On the touch screen the two results sit in the same view as the set temperature, applied load, material name, cut cycle, interval and sample weight - so a single screen capture documents the whole condition set behind the numbers.
How a melt flow run is set up and read
- The instrument is the classic extrusion plastometer layout: a heated barrel with the standard discharge port (2.095 mm ±0.005mm in diameter, 8.000 mm ±0.025mm long), a loaded piston above it, and the cutting station at the die.
- Pellets fill the barrel, the eight-grade gravity loads are applied (the base 0.325 kg grade combines the rod, the thermal unit and the No.1 tray body; higher grades add calibrated weights up to 21.600 kg), and the set temperature is entered on the touch screen.
- Once the barrel is at temperature, the piston extrudes under load and the extrudate is cut at the programmed interval - automatically, or by hand if the lab prefers manual cutting.
- The timed extrudate is weighed and the machine reports MFR and MVR; the interval timer spans 0.01-99.99s for fine cuts and 1-9999s for the full 10-minute module, both at 0.1s accuracy.
From pellets to printed report
- The touch screen display carries the full method: temperature set, load, material, cut cycle, interval, sample and the MFR/MVR results, plus on-screen controls such as stop and heat off.
- The built-in printer outputs the test report at the bench, so a finished result leaves the lab without a PC in the loop.
- The supply kit covers the consumable side: the weight set, the PTFE barrel and port components, the cutting tools and the protective gloves that come with hot work at the die.
HST-XNR-400DT specifications
Measurement
- Measuring range: 0.1-800.00 g/10min (MFR); 0.1-800.00 cm3/10min (MVR)
- Test method: MFR and MVR by extrusion plastometer
Temperature
- Temperature range: room temperature to 450deg C
- Temperature accuracy: ±0.2deg C
- Temperature resolution: 0.1deg C
Timing
- Timing range: 1-9999s or 0.01-99.99s
- Timing accuracy: 0.1s
Load set
- Standard test loads, eight grades: 0.325 / 1.200 / 2.160 / 3.800 / 5.000 / 10.000 / 12.500 / 21.600 kg
- Relative error of load test: ≤0.5%
Barrel and port
- Discharge port: 2.095mm ±0.005mm diameter, 8.000mm ±0.025mm long
- Loaded barrel: 9.550mm ±0.025mm diameter, 152mm ±0.1mm long
- Piston head: 9.475mm ±0.015mm diameter, 6.350mm ±0.100mm long
Display and output
- Display: touch screen
- Cutting: automatic or manual
- Print: equipped with a printer for the test report
Operating
- Ambient temperature: 10deg C to 40deg C
- Relative humidity: 30% to 80%
- Power supply: AC 220V, 50Hz
Selection guide: where the XNR-400DT fits
- You are testing high-temperature resins - polycarbonate, aromatic sulfone, fluoroplastics, nylon - and need a barrel that genuinely holds 450deg C.
- Your portfolio spans commodity and engineering grades, so the 0.1-800.00 g/10min window and the 21.600 kg top load keep one instrument across the whole range instead of splitting it between a low-range unit and a high-load unit.
- You want both MFR and MVR from the same run for blend development, rather than back-calculating one from the other.
- If the lab only checks one or two low-melting commodity resins at fixed loads, manual cutting alone is all it needs - the automatic cut and the 450deg C range are what carry the machine into the harder protocols.
- For the rest of the plastics thermal suite, the XNR-400DT works with its sisters in the plastic pipes and rubber test machine line: the HDT&VICAT Softening Point Temperature Tester for heat-deflection and Vicat points, and the Differential Scanning Calorimeter for melting and transition behavior.
Total cost of ownership
- Power is an ordinary AC 220V 50Hz circuit - no three-phase supply and no special utility hookup stated on the sheet.
- Loading is gravity, so the running cost is the electricity of one heated barrel plus routine care of the PTFE components.
- Consumables are the wear parts the kit already anticipates: PTFE barrel and port pieces, cutting tools, gloves.
- The floor-standing frame keeps the test self-contained at one position, with the report printing at the machine rather than through a separate PC setup.
Standards and compliance
- GB/T 3682-2000 - determination of melt flow rate and melt volume flow rate of thermoplastics
- ISO 1133:1997 - determination of melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics
- ASTM D1238 - standard test method for melting flow rate of thermoplastics by extrusion plastometer
The product sheet also documents the machine line's CE attestation under the 2006/42/EC Machinery Directive (Annex VIII, UDEM, report M.2023.206.C81366, covering the HST testing-machine range including the XNR-400) and ISO 9001 registration (GB/T 19001-2016/ISO 9001:2015, CTC, for the production and sales of testing machines).
Frequently Asked Questions (FAQ)
1. What is the temperature range of the HST-XNR-400DT?
Room temperature to 450deg C, with ±0.2deg C control accuracy and 0.1deg C resolution.
2. What melt flow range does it cover?
0.1 to 800.00 g/10min for MFR and 0.1 to 800.00 cm3/10min for MVR.
3. How many load grades are included?
Eight standard gravity loads from 0.325 kg up to 21.600 kg, with a load test relative error of 0.5% or less.
4. Is the cut automatic?
Yes - automatic or manual cutting, with the interval set from 0.01-99.99s or 1-9999s at 0.1s accuracy.
5. Can it print the report?
Yes, the machine is equipped with a printer that outputs the test report at the bench.
HST GROUP – Focus on Material Test. Kindly contact HST Group via WhatsApp at +86 15910081986.
