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OCTOBER 2002

Summary of Physical Properties of MP-1 Polyimide

(Gamma irradiated at 5Mrad)

MP-1 is a high crosslinked thermoset polymer. Recently approved as a biocompatible material according to ISO 10993-1



Summary of Physical Properties of MP-1 Polyimide

Property

Test Method

MP-1 Polyimide

Density

ASTM D 792

1.38-1.42 g/cm3

Hardness

ASTM D 735

89 SD

Tensile strength

ASTM D 638

108.7 ± 8 MPa

Tensile elongation

ASTM D 638

Yield: 3.3 ± 0.2 %

Break: 8.9 ± 1.5%

Tensile modulus

ASTM D 638

3748 ± 52 MPa

Compression strength (@ 10%)

ASTM D 694

161.4 ± 2.3 MPa

Compression modulus

ASTM D 695

3578 ± 357 MPa

Flexural Strength

ASTM D 790

111.6 ± 10.9 MPa

Flexural Modulus

ASTM D 790

4273 ± 177 MPa

Impact strength (Charpy method, Izod notched)

ASTM D 256

1.647 ± 0.047 ft*lb/in

Tg

DMA

TMA

311 ° C

315 ° C

Tm

DSC

DMA

TMA

414 ° C

408° C

412° C

Melt energy

DSC

29.78 J/g

Crystallinity %

X-ray analysis

7.66%

Coefficient of thermal expansion

DMA

T < Tg 48 x 10-6

T > Tg 117 x 10-6

Td

weight loss(%)

TGA

Weight loss(%)

T < 450 °C: 0%

T = 536° C: 1.6%

T = 650° C: 30%

T = 800°C: 38%

T = 936° C: 42%

Abrasion coefficient

N/A

2.129 cm3*105/kg.m.hr

Water absorption (@80°C, %)

ASTM C-20

0.014

Porosity

ASTM C20

0.018

Poisson Ratio

N/A

0.333

Dielectric strength (11.76 GHZ)

„� = 2.907 δ = 0.001



*DMA: Dynamic Mechanical Analysis; TMA: Thermal Mechanical Analysis; TGA: Thermo Gravimetric Analysis

In addition to the physical properties summarized above, photo-acoustic Fourier Transform Infrared Analysis was performed on specimens before and after irradiation. This analysis demonstrated the presence of the following chemical groups: C‑H, imide, aromatic, and ether. Irradiation did not alter the characteristic peaks.

Creep and fatigue tests were performed with ultimate results(will be supplied upon request and NDA signing).

Stability test of immersed samples (5 Mrad irradiated) in saline 70 Deg C for 60 days showed no deterioration of physical properties(Report will be supplied upon request).