Melt Mass-Flow (MFR) and Melt Volume-Flow (MVR) Rate - ISO 1133
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Extrusion rate of a resin through an orifice of defined dimensions at a specified temperature and load. Flow rates can be used to differentiate grades or provide a measure of degradation of a material as a result of molding.
Melt Flow Rate Procedures
| Procedure |
Description |
| A |
Manual Testing |
| B |
Automated Testing |
The testing conditions are most commonly reported as temperature/load (i.e. 190°C/2.16 kg). Occasionally test conditions are represented by a letter code. These letter codes are described below.
Flow Rate Condition Letter Codes
| Letter Code |
Temperature (°C) |
Load (kg) |
| A |
250 |
2.16 |
| B |
150 |
2.16 |
| D |
190 |
2.16 |
| E |
190 |
0.325 |
| F |
190 |
10.00 |
| G |
190 |
21.60 |
| H |
200 |
5.00 |
| M |
230 |
2.16 |
| N |
230 |
3.80 |
| S |
280 |
2.16 |
| T |
190 |
5.00 |
| U |
220 |
10.00 |
| W |
300 |
1.20 |
| Z |
125 |
0.325 |
The term Melt Index is commonly used in place of the Melt-Mass Flow Rate for polyethylene at 190°C/2.16 kg.
Common Melt Flow Rate Conditions by Material
| Material |
Condition |
| PS |
200/5.00 |
| PE |
190/2.16 |
| 190/0.325 |
| 190/21.60 |
| 190/5.00 |
| PP |
23/2.16 |
| ABS |
220/10.00 |
| PS-I |
200/5.00 |
| E/VAC |
150/2.16 |
| 190/2.16 |
| 125/0.325 |
| SAN |
220/10.00 |
| ASA, ACS, AES |
220/10.00 |
| PC |
300/1.20 |
| PMMA |
230/3.80 |
| PB |
190/2.16 |
| PB |
190/10.00 |
| POM |
190/2.16 |
| MABS |
220/10.00 |
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