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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

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

Similar Standards

ASTM D1238

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