1. Appearance Quality

Entityof inner and outer walls should be smooth,uniform and smooth,without defects of the crater and the formation of impurities;the appearance of uniform color,no decomposition of the color lines and spots;cross section no bubbles, cracks;the lining of the silicon core close fusion bonded no absolve phenomenon;the outer wall of productsmarked andclear.

2. Ring Stiffness,KN/m2

≥*0

3.Flat Test

Pressure vertically to the outside diameter of the deformation for *0% of the original OD, immediately unloading, the specimen does not rupture, not hierarchical.

4. Restoration Ratio

Pressure vertically to the outside diameter of the deformation for *0% of the original OD, immediately unloading, the specimen does not rupture, not hierarchical, outside diameter natural recovery to more than *0% of the original.

5. Tensile Strength,Mpa

≥*1

6. Extension Rate at Break,%

≥**0

7.Max Traction Load,N

≥***0

8. Falling Weight Impact Test

Temperature 0 ° C, height of 2m, with 2Kg hammer impact *0 times should be more than nine times the cracking phenomenon.

9. Ektexine Hardness,HD

≥*9

*0Hydraulic Pressure Test

Temperature of *0 ° C, pressure *0Kpa conditions, maintain **-hour sample of the connector, pipe plug leakage.

*1Longitudinal Reversion,%

≤3

*2. Cold Bending, Semidiameter  mm

≤**0

*3.Friction Factor

Static ( plate )

≤0.*5

Dynamic ( drum method)

≤0.*5

*4. Line Frequency Hardness,KV/mm

≥*5

*5. Chemical Resistance

The samples are placed in the 5% NaCL, *0%H2SO4, *0%NaOH solution soak for *4 hours, no obvious corrosion phenomenon.

*6. Cracking Resistance,MPa

≥2.0