MFR / MVR

Melt Mass-Flow (MFR) and Melt Volume-Flow (MVR) Rate
Standard: ISO 1133/ASTM D1238

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.

A Manual Testing
B Automated Testing
C Automatically Timed Flow Rate Measurement for High Flow Rate Polyolefins Using Half-Height, Half Diameter Die

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.

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

PS 200/5.00, 230/1.2, 230/3.8, 190/5.0
PE 125/2.16, 190/10, 190/2.16, 190/0.325, 190/21.60, 190/5.00, 125/0.325, 250/1.2, 310/12.5
PP 230/2.16
ABS 220/10.00, 200/5.0, 230/3.8
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, 230/1.2
PB 190/2.16
PB 190/10.00
POM 190/2.16
MABS 220/10.00
Acetals (copolymer and homopolymer) 190/2.16, 190/1.05
Acrylonitrile/butadiene/styrene/polycarbonate 230/3.8, 250/1.2, 265/3.8, 265/5.0
Cellulose esters 190/0.325, 190/2.16, 190/21.60, 210/2.16
Ethylene-chlorotrifluoroethylene copolymer 271.5/2.16
Ethylene-tetrafluoroethylene copolymer 297/5.0
Nylon 275/0.325, 235/1.0, 235/2.16, 235/5.0, 275/5.0
Perfluoro(ethylene-propylene) copolymer 372/2.16
Perfluoroalkoxyalkane 372/5.0
Polycaprolactone 125/2.16, 80/2.16
Polychlorotrifluorethylene 265/12.5
Polymonochlorotrifluoroethylene 265/21.6, 265/31.6
Polyterephthalate 250/2.16, 210/2.16, 285/2.16
Poly(vinyl acetal) 150/21.6
Poly(vinylidene fluoride) 230/21.6, 230/5.0
Poly(phenylene sulfide) 315/5.0
Styrene acrylonitrile 220/10, 230/10, 230/3.8
Styrenic Thermoplastic Elastomer 190/2.16, 200/5.0
Thermoplastic Elastomer-Ether-Ester 190/2.16, 220/2.16, 230/2.16, 240/2.16, 250/2.16
Thermoplastic elastomers (TEO) 230/2.16
Vinylidene fluoride copolymers 230/21.6, 230/5.0