Melt Mass-Flow (MFR) and Melt Volume-Flow (MVR) Rate - ISO 1133
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 |
230/2.16 |
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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