PE

PET

Ⅰ

Ⅱ

Ⅰ

Ⅱ

D

1

tensile properties

tensile force（N/50mm）  ≥

150

200

150

200

—

the maximum  peak expands rate% ≥

200

30

—

elongation at break% ≥

250

150

450

experimental phenomena

in the stretching process, the center of specimen without bitumen coating cracking or base separation phenomenon

—

 2

nail tear resistance/N ≥

60

110

30

40

—

3

heat resistance

70℃slide not more than 2mm

4

low temperature flexibility/℃

-20

-30

-20

-30

-20

non-flaw

5

waterproofness

0.2MPa，120min

—

6

peel strength/(N/mm)≥

with waterproof sheet

1.0

Withaluminium sheet

1.5

7

screw rod water tightness

pass

8

permeability oil /sheet ≤

2

9

persistent adhesivity /min  ≥

20

10

thermal ageing

pull retention% ≥

80

elongation rate%  ≥

200

30

400(asphalt layer fracture elongation)

   low temperature flexibility/℃

-18

-28

-18

-28

-18

non-flaw

peeling strength(N/mm) ≥

1.5

11

thermal stability

appearance

no drum, fold, sliding, flowing

dimensional change/% ≥

2