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Polyurethane Properties and Characteristics

Thermoplastic polyurethanes (TPU) combines the best of rubber and plastic, without the weaknesses inherent in plasticized vinyl films that are subject to brittleness and other problems caused when plasticizers leach to the surface. Urethane is easy to work with, and is readily modified to suit a particular application through the addition of fillers, colors, stabilizers, and lubricants, as well as other additives.

  • Durometer (Hardness) Urethane film and sheet can be produced in a range of durometers (Shore A 75 - Shore D 55) from relatively stiff to a thin film having an extremely soft, non-plastic feel that is ideal for products that come in contact with the skin.
  • Low temperature flexibility Urethanes feature superior flexibility over a wide durometer range, even at temperatures as low as -60°F (-50°C).
  • Tensile strength Tensile strength ranges from 4,000 to 10,000 psi, assuring reliability and durability over the life span of the end product. Because urethanes are tough, they can be used in thinner gauges when compared to vinyl.
  • Elongation TPU film and sheet can elongate as much as 800% and return to its original dimension without significant loss of "memory."
  • Abrasion resistance Polyurethane provides excellent abrasion resistance. In profile form it is tough enough for conveyor drive belts and protective sheaves for elevator cables and pulleys.
  • Chemical and environmental resistance Polyether and polyester urethanes each have specific chemical resistance characteristics, such as resistance to hydrocarbons, chemicals, ozone, bacteria, fungus, and moisture, as well as skin oils. They provide durability and long life in harsh industrial environments.
  • Fabrication versatility Urethane can be fabricated in many ways with many different substrates, enhancing design versatility. Sheet can be fabricated with urethane tubing to provide the benefits of urethane to an entire product system, such as in linked bladder applications.

Our Urethane can be:

  • Cut
  • Sewn
  • Adhesive bonded
  • Laminated
  • Vacuum formed
  • Radio frequency (RF) sealed
  • Thermally bonded to itself or other materials
  • Printed or silk-screened

 

Film and Sheet

TPU offers a broad range of high-performance properties and characteristics, making it the material of choice for many "can't fail" applications. It is inherently strong, tough, and easy to work with, and unlike vinyl, it contains no plasticizers, so it won't become brittle or lose its performance properties over time.

TPU compounds possess a combination of properties not available in any other thermoplastic material. When two of these properties are needed in an application, such as low temperature flexibility and soft durometer, TPU will usually outperform any other material. (View properties comparison chart)

Our Urethane offers a full range of thermoplastic polyurethane, including aromatic and aliphatic materials in both polyester and polyether. Film and sheet are available in thicknesses from .001" to .060", and in widths from 6" to 96". Our films are available in Tubular form, single wound sheeting and other configurations. A variety of colors, opacities and surface textures are available.

Standard grades of Urethane film and sheet satisfy most application requirements. Other grades are available or can be custom compounded to meet specific application needs, including films rated for potable water contact and UL Listed flame-resistance, as well as food and medical requirements.

Properties of The Film - TPU
Tear strength
Tear strength is the term which defines the resistance of a notched test specimen ( TPU Elastomers ) to tear propagation. Tear strength is generally regarded as the critical indication of the physical strength to external force. In this respect, our film is superior to most of other plastics.

Properties

The Film

PVC

NBR

CR

NR

Hardness shore A

96

90

94

87

78

70

77

Tear Strength (kN/m)

 

Right angle cut

129

80

70

70

37

36

65

Line cut

137

63

38

48

19

25

40


Abrasion resistance

Our film can withstand a lot of physical abuse including scratch, friction, corrosion forced upon the surface of the materials. With over three times the durability of rubber, Our film provides excellent abrasion resistance, functioning well across a broad range of end-applications.

The Film

Rubber

Nylon

PVC

PE

Other Plastic

Abrasion

(mg)

Item

Abression

(mg)

Item

Abression

(mg)

Item

Abression

(mg)

Item

Abression

(mg)

Item

Abression

(mg)

0.5 ~ 3.5

SBR

177

NYLON6

366

General

160

HDPE

29

PS

324

NBR

205

NYLON66

49

Soft grade

187

LDPE

70

PBS

545

CR

280

NYLON610

16

Hi-strength

122

 

 

PET

18

NR

146

NYLON11

24

 

 

 

 

ABS

275


Flex-Crack resistance
Flex-crack resistance should be taken into account when it comes to the selection of composite film that are constantly under severe external force, and the stability to flex is critical. Our film exhibits excellent dynamic flex performance and has lead to the use in many demanding applications.

Properties

The Film

PVC

NBR

CR

NR

Hardness shore A

96

90

94

87

78

70

77

Flexural

 (10K Time)

192

300 *

165

300 **

10

300 **

25

*no crack effect after 3000K times   

 **Crack effect becomes inevitable after 3000K times

 


Hydrolysis resistance
At normal temperatures, our film exhibits outstanding resistance to hydrolysis for 1-2 years without undergoing any changes (decomposition) while its mechanical properties are still maintained. In particular, our film Ether grade demonstrates superior hydrolysis resistance to Ester grade. If Polyester based TPU film series is exposed for six months to hot water at 50 degrees ( or at 70 degrees for three weeks, or 100 degrees for 3 to 4 days ), an irreversible break down of the Polyester chains will occur through hydrolysis ( decomposed ) ; and as the consequences, the mechanical properties of the film will deteriorate. In this respect, our film is regarded as environmentally friendly materials. For end applications that constant contact with water is inevitable, our film Ether grade is certainly the ideal candidate to be taken into consideration.  

Resistance to oil, chemicals and greases
The excellent resistance to greases and pure mineral oils (such as lubricating, fuel, and diesel oils) provided by our film makes it well suited for many industrial and food contact applications. Our film does not react chemically to the oil contamination and usually results in higher tensile strength than the initial properties detected. While the response of other plastics materials to oil contamination appears to be poor, Our film has once again proved to be superior to other plastics materials. However, in the case of contamination of water identified in mineral oils, the reduction in TPU film physical properties is inevitable.

Properties

ASTM No.1 oil

ASTM No.3 oil

The Film

NBR

CR

The Film

NBR

CR

Hardness

Tensile strength

Elongation

Volume

0

+5.5

+15.5

-0.5

+15

+20.1

-21.5

-3.8

-2

-10.2

-13.2

+1.5

-1

-6.5

-6.8

+3.7

-6

-5.6

-17.6

-12.7

-20

-27.3

-33.3

+56.2


Heat resistance and ageing (Weatherability)
Plastics are chemically degraded by the effect of UV-radiation and heat. For outdoor applications, weather stability is an important criteria in material selection. For use in high temperature ( above 70 degrees, for example ), various grades are available that can provide additional protection against degradation ( oxidized, aging) under any severe climates. Our film can be used over a wide range of temperatures. While Ester grade can withstand temperatures up to 130 degrees, Ether grade can withstand up to 90 degrees. The table below shows the comparison of our film to other plastics to other plastics in respect to degradation.

Properties

The Film

Ester base

PVC

NBR

CR

NR

95A

85A

85 PHR

80 PHR

Tensile /MPa first 34.3 25.3 16.0 16.3 11.6 10.3 16.3
after aged** 51.3 42.4 14.6 18.1 9.8 9.6 5.6
variation 150 168 91 111 85 93 34
Elongation  first 700 517 308 350 400 400 450
 after aged ? 460 600 213 238 188 238 450
variation 66 116 69 68 47 60 0

Low Temperature Flexibility
Our film can withstand temperature down to -30 degrees while mechanical and physical properties are still maintained. Most importantly, our film will not become brittle and can thus be utilized as a replacement for PVC. In this respect, our film can be used for applications that require superior low temperature flexibility.  

Microbiological resistance
Polyether-based thermoplastic Polyurethane exhibits excellent resistance to microbiological attack. The table below shows some comparative results of microbial degradation from various elastomers materials.

Microbe

The Film
Ether base

PVC

NBR

CR

NR

95A

85A

  85

80

Mildew (1)

Mildew (1)

Mildew (1)

Mildew (1)

Other Microbe

0

0

0

0

0

0

0

0

0

0

>30

>30

>30

>60

>60

>60

>30

>60

>30

>60

0

0

0

0

0

0

0

0

0

0

<10

>10

>10

0

<10


Gas permeability
Our film can be easily processed by high frequency or hot plate welding and has been widely used in inflatable end-applications. The diffusion coefficient is a material constant which specifies the volume of gas that will pass through a test specimen of known surface area and thickness in a fixed time, with a given partial pressure difference. The diffusion coefficient varies to certain extent depending on the type of gas in questions. Generally speaking, our film Ester series has superior gas permeability to Ether grade.

Biocompatibility
Our film exhibits superior biocompatibility. With the characteristics of sterilization, anti- allergic, without creating the source of heat and agitation to parts, Our film are widely utilized in medical, sanitary, sport, or protective devices.
To Request A Quote, Receive More Information or Place an Order...
Contact us and a knowledgeable product specialist will assist you.

For assistance with ordering Polyurethane Products, ask for product specialist:

Richard Miller
Toll Free: 888 353 9732
Tel: 585 544 1200
Fax: 585 544 2586
richard@extrapackaging.com