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ISO 1133 Test Standard Explained

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Melt Mass-Flow (MFR) and Melt Volume-Flow (MVR) Rate - ISO 1133

ISO 1133 Purchase and download the official ISO 1133 test standard today!

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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Property information for specific grades of resin are available in the Prospector.
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