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Millathane® 5004

A High Performance Millable Polyurethane Rubber

Millathane 5004 (formerly known as Vibrathane 5004) is a peroxide curable polyester millable urethane rubber. It has excellent processing characteristics and can be injection molded easily. In addition to excellent abrasion resistance, Millathane 5004 has the highest stress strain values of all peroxide cured polyurethanes. The cured stock has excellent tear strength, excellent low temperature flexibility and resistance to oxygen, ozone, fuels and oils.

For more information about Millathane® and Thanecure® products, please contact: Lynn Zylka at (727) 540-1358 or contact Lynn here.


Millathane 5004 is processed by techniques which are common to the rubber industry. Compounds can be mixed on an open mill or in an internal mixer; molded articles can be produced via compression, transfer or injection molding; calendered sheets can be press or rotocured.



Millathane 5004 compounds typically contain reinforcing fillers to meet hardness and mechanical strength requirements, but gum compounds, with little or no fillers, have good properties. Reinforcing fillers like silica and small particle carbon black are easily incorporated into Millathane 5004. Millathane 5004 is peroxide-curable only. Typical peroxides used include DiCup 40C and Varox DBPH-50. Carbodiimides can be added at 1-5 parts for improved hydrolysis resistance. A compound with 5 parts of polymeric carbodiimide (Millstab™ P) had excellent retention of properties after 1 year water exposure.



Vulcanizates based on Millathane 5004 can be produced in hardnesses ranging from 40 to 95 Shore A, and offer very good abrasion resistance, excellent oil resistance, good low temperature properties and good gas permeability.



Chemical type Polyester polyurethane
Color/Physical form White to off-white chunks
Packaging 50 lb. (22.7 kg) box
Odor Faint, characteristic
Specific gravity 1.21
Mooney viscosity,
50 – 70
Storage stability 2 years when stored under dry and cool conditions


Hardness range 40 – 95 A
Tensile strength Up to 5000 psi, (35 MPa)
Tear strength Up to 350 lb/in (61 kN/m) (Die C)
Ozone resistance Excellent
Hydrolysis resistance Good (Improved with carbodiimides)
Oil & fuel resistance Very Good/Excellent
Abrasion resistance Excellent
Resilience 40 - 50%



Vulcanization Conditions

Compounds based on Millathane 5004 are vulcanized at temperatures of 150º - 175ºC, depending on the peroxide used, with typical cure times of 5 to 20 minutes for compression molded lab sheets. Injection and transfer molding are also being used commercially with Millathane 5004 compounds.


Formulation Example

(See the Millathane Formulary below for other compound examples)

Millathane 5004 100.0
Stearic Acid 0.2
N330 Black 25.0
DBEEA (TP-95) 5.0
Struktol WB222 1.0
Polymeric carbodiimide (Millstab™ P) 2.0
DiCup 40C 5.0
Cured Properties, press cure 16'/160ºC
Hardness, Shore A 70  
TSE100*, psi (MPa) 475 (3.3)
TSE200*, psi (MPa) 1090 (7.5)
TSE300*, psi (MPa) 1950 (13.4)
Tensile Strength, psi (MPa) 4100 (28.3)
Elongation at break, % 525  
Tear Die C, lb/in (kN/m) 314 (55)

*TSExxx=Tensile Stress at xxx% Elongation

Bashore resilience, % 46
DIN Abrasion, mm³ loss 57
Compression set, 22 hr/70ºC, % 10
Compression set, 22 hr/100ºC, % 36
Compression set, 22 hr/125ºC, % 53
Oven Aging, 70 Hr/100ºC
Hardness change +5
Tensile strength, % change +3
Elongation, % change -5
IRM 903 Oil Aging, 70 Hr/100ºC
Hardness change -3
Tensile strength, % change -30
Elongation, % change -37
Volume change, % 2

Vibrathane is a registered trademark of Chemtura Corp.



Millathane® 5004 Compounds
Hardness, Shore A ID/Link Description
53 952

Non-Black Molding Compound - Excellent Properties

58 570

Non-Black ASTM D2000 M4BG62 8A14B14

67 587

Black Fuel Bladder

70 TIPS V4-2

Black Weather/Water Resistant Compound

80 700

Non-Black Seal

84 84H Wheel

Black Tank Track/Wheel Starting Formula

91 623

Black Molding Compound