GB 18243 -200x    
ICS 91.120.30  
Q 17  
GB 
 
National Standards of the People’s Republic of China  
 
GB 18243 – 200X  
Replaces GB 18243 - 2000   
 
 
 
 
 
Atactic polypropylene (APP) modified bituminous sheet materials  
 
 
 
(Draft for Approval)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Issue Date: 200X – XX -XX              Implementation Date: 200X –XX -XX 
 
 
Issued by the General Administration of Quality Supervision, Inspection and 
Quarantine, The People’s Republic of China (AQSIQ) and the Standardisation 
Administration of the People’s Republic of China (SAC )   GB 18243 -200x    
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   GB 18243 -200x    
Foreword  
 
Articles 5.3 and 8.1 of this Standard are mandatory, whilst the rest are 
recommended.  
 
This Standard is identical but non -equivalent to EN 13707 – 2004 “Flexible sheets for 
waterproofing. Reinf orced bitumen sheets for roof waterproofing – Definitions and 
characteristics .” 
 
This Standard replaces GB 18243 – 2000 “Atactic polypropylene (APP) modified 
bituminous sheet materials.”  
 
The main changes to this Standard when compared with GB 18243 – 2000  are as 
follows:  
 
- Glass fibre enhanced felt is added in the padding (3.1.1 in version 2000; 3.1.1 
in this version);  
- Products with a thickness of 5mm have been added; products with a thickness 
of 2mm have been removed (3.2.2 in version 2000; 3.2 in this ver sion);  
- Product application suggestion has been revised (3.4 in version 2000; 3.4 in 
this version);  
- Roll weight has been replaced by mass per unit area (4.1 in version 2000; 4.1 
in this version);  
- Raw material requirements have been added (Article 4 of this version);  
- Sub-peak pull, second peak elongation, mass increase after water permeation, 
heat aging, seam peeling strength, nail shank tearing strength, mineral granule 
adhesion, lower sheet bituminous coating thickness of sheet surface have been 
added in Ma terial Characteristics (Table 3 in version 2000; Table 2 in this 
version);  
-  Pull has been revised and tearing strength has been removed (Table 3 in 
version 2000; Table 2 in this version);  
- Test methods have been modified; tests are conducted according to GB /T 328-
2007 (Article 5 in version 2000; Article 6 in this version);  
- Final factory inspection items have been revised, type inspection period has 
been modified (6.1 in version 2000; 7.1 in this version);  
 
This Standard is proposed by the Chinese Federation of Construction Materials .  
  
This Standard is under the jurisdiction of the National Standardisation Technical 
Committee  of Light and Decoration Materials (SAC / TC 195) . 
 
The units responsible for drafting this Standard are: the Chinese Construction Indu stry 
Association of Waterproof Materials, the Construction Material Industry Technical 
Supervision and Research Centre, Suzhou Waterproof Material Research and the 
Design Institute of China Chemical Construction Material Corporation.  
 
The units that partic ipated in drafting this Standard are: Panjin Yuwang Waterproof 
Materials Group Co. Ltd, Shanghai Construction Waterproof Materials (Group) 
Corporation, Yizhong (Qingdao) Chemical Construction Materials Co. Ltd, Beijing 
Oriental Rainbow Waterproof Technolog y Corp. Ltd, Xuzhou Woniushan New   GB 18243 -200x    
Waterproof Materials Co. Ltd, Guangdong Keshun Chemical Industry Co. Ltd, 
Baoding North Waterproof Engineering Company, Wenzhou Great Wall Waterproof 
Materials Factory, Dongying Daming Waterproofing Co. Ltd, Dalian Xiyang 
Waterproof Engineering Group Ltd, Shaanxi Changyan Property Co. Ltd, Wujiang 
City Yexing Waterproof Materials Co. Ltd, Changshu City Sanheng Building 
Material Co. Ltd, Shanghai Taian Industrial Co. Ltd, Yangzhou Zhigao Building 
Waterproof Materials Co. Ltd , Hubei Yeongyang Waterproof Materials Co. Ltd, 
Feudenberg Baolide (Shanghai) Trading Co. Ltd, Tangshan Desheng Waterproof 
Materials Co. Ltd, Suzhou Lixing Waterproof Materials Co. Ltd, Ningbo Yinzhou 
Jinsong Waterproof Materials Plant and Panjin Dayu Wate rproof Building Materials 
Co. Ltd.  
 
The main drafters of this Standard are: Zhu Zhiyuan, Yang Bin, Zhu Dongqing, Zhan 
Fumin, Duan Wenfeng, Song Xinhua, Zhu Xiaohua, Wu Jianming, Chen Bin, Chen 
Wenjie, Wei -Zhong Chen, and Qu Jianmin.  
 
The interpretation of this Standard is assigned to Suzhou Waterproof Materials 
Research Institute.  
 
This Standard was first issued in 2000.  
   GB 18243 -200x    
   GB 18243 -200x    
Atactic polypropylene (APP) modified bituminous sheet materials  
 
1 Scope  
 
     This Standard sets the classifications, technical require ments, test methods, 
inspection rules , markings and user manual requirements for  atactic polypropylene 
modified bituminous sheet materials (abbreviated as APP waterproof sheet).  
  
This Standard  applies to  waterproof sheets made from the padding of polyeste r felt, 
glass fibre felt or enhanced glass fibre polyester felt, by the bitumen modifier of 
atactic polypropylene or polyolefin polymer (APAO, APO) and coated on both sides 
with insulation materials . 
 
2 Normative References  
 
The provisions of the following d ocuments become provisions of this Standard after 
being referenced. For dated reference documents, all later amendments (excluding 
corrigenda) and revised versions do not apply to this Standard. However, the parties 
to the agreement are encouraged to study  whether the latest version of these 
documents applies. For undated reference documents, the latest versions apply.  
GB/T 328.2  Test methods for building sheets for waterproofing – Part 2: 
bitumen sheets for waterproofing - Visible defects  
GB/T 328.4  Test m ethods for building sheets for waterproofing – Part 4: 
bitumen sheets for waterproofing – Thickness and mass per 
unit area  
GB/T 328.6  Test methods for building sheets for waterproofing – Part 6: 
bitumen sheets for waterproofing – Length, width and 
straight ness 
GB/T 328.8  Test methods for building sheets for waterproofing – Part 8: 
bitumen sheets for waterproofing – Tensile properties  
GB/T 328.10 - 2007  Test methods for building sheets for waterproofing – Part 10: 
bitumen, plastic and rubber sheets for water proofing – 
Watertightness  
GB/T 328.11 - 2007  Test methods for building sheets for waterproofing – Part 11: 
bitumen sheets for waterproofing – Flow resistance at elevated 
temperature  
GB/T 328.14  Test methods for building sheets for waterproofing – Part 14: 
bitumen sheets for waterproofing – Flexibility at low 
temperature  
GB/T 328.17 - 2007  Test methods for building sheets for waterproofing – Part 17: 
bitumen sheets for waterproofing –Adhesion of granules  
GB/T 328.18  Test methods for building sheets for water proofing – Part 18: 
bitumen sheets for waterproofing – Resistance t tearing (nail 
shank)  
GB/T 328.20  Test methods for building sheets for waterproofing – Part 20: 
bitumen sheets for waterproofing – resistance of peeling of 
joints  
GB/T 328.26  Test methods f or building sheets for waterproofing – Part 26: 
bitumen sheets for waterproofing – Dissoluble content (coating 
material content)    GB 18243 -200x    
GB/T 18244  Test methods for resistance to weathering of building 
waterproof materials  
GB/T 18840  Padding for bituminous water proof sheets   
JC/T 904  Elastomer modified bitumen  
 
3 Classifications and Labelling  
 
3.1 Type  
 
3.1.1 Padding is classified as polyester felt (PY), glass fibre felt (G) and glass fibre 
enhanced polyester felt (PYG).  
 
3.1.2 Upper surface insulating material  is classified as polyethylene coating (PE), 
fine sand coating (S) and mineral granule coating (M); lower surface 
insulating material is classified as fine sand (S) and polyethylene coating (PE).  
 
Note: fine sand coating is coating by mineral granules with a diameter of less  
than 0.60mm.  
 
3.1.3 The products are classified as Type I and Type II according to the 
characteristics of their material.  
 
3.2 Specification  
 
The nominal sheet width is 1000 mm.  
The nominal thickness of polyester felt sheet is 3 mm, 4mm, 5mm.  
The nominal thickness of glass fibre felt sheet is 3 mm, 4mm.  
The nominal thickness of glass fibre enhanced polyester felt is 5 mm.  
The nominal size of sheet is 7.5 m2, 10m2, 15m2. 
 
3.3 Labelling  
 
The product is labelled in the following sequence: name, model, padding, 
upper surfac e material, lower surface material, thickness, size and code of 
Standard.  
 
Example: Type I elastomer modified bituminous waterproof sheet with a size 
of 10m2, thickness of 3 mm, upper surface of mineral granules and lower 
surface of polyethylene coating po lyester felt is labelled as:  
 
 SBS I PY M PE 3 10 GB 18242 – 200X  
 
3.4 Application  
 
3.4.1 Elastomer modified bituminous waterproof sheets are mainly suitable for 
industrial and civil roofing, and underground waterproof engineering work.  
 
3.4.2 Glass fibre enhanced polyest er felt sheets can be used in machinery fixed 
single layer waterproof sheets subject to wind load resistance testing.  
   GB 18243 -200x    
3.4.3 Glass fibre sheets are suitable for the bottom layer in multi -layer waterproof 
work.  
 
3.4.4 Waterproof sheets with an upper surface insulating material of opaque mineral 
granules are suitable for exposed application.   
 
3.4.5 Waterproof sheets with surface insulation material of fine sand are used in 
underground waterproof work.  
 
4 Raw materials  
 
4.1 Modified bitumen  
  
 Modified bitumen should conform to the  requirements of JC/T 904.  
 
4.2 Padding  
 
4.2.1 Only polyester felt, glass fibre felt and glass fibre enhanced polyester felt 
should be used as padding.  
 
4.2.2 The application of polyester felt and glass fibre felt should conform to the 
requirements set out in GB/T 18840.  The specification and characteristics of 
glass fibre enhanced polyester felt should meet the requirements for 
waterproof sheet production as set out in this Standard.  
 
4.3 Surface insulation materials  
 
Polyester (PET) coating and heat resistance polyethylene coating may not be 
used as surface insulation materials.   
 
5 Requirements  
 
5.1 Mass per unit area, size and thickness  
 
The mass per area, size and thickness should conform to the requirements set 
out in Table 1.  
 
Table 1 - Mass per unit area, Size and Thickness  
 
Specs (nominal thickness) 
mm 3 4 5 
Upper surface materials  PE S M PE S M PE S M 
Lower surface materials  PE PE, S  PE PE, S  PE PE, S  
Nominal area  10, 15  10, 7.5  7.5 Area 
(m2/sheet)  Deviation  ± 0.10  ± 0.10  ± 0.10  
Mass per unit area (kg/ m2) 3.3 3.5 4.0 4.3 4.5 5.0 5.3 5.5 6.0 
Average value 
 3.0 4.0 5.0 Thickness 
mm 
 Minimum unit 
value  2.7 3.7 4.7 
   GB 18243 -200x    
5.2 Appearance  
 
5.2.1 The sheet should be rolled up tightly and neatly. Inward and outward 
unevenness at the roll ends should not exceed 10 mm.  
 
5.2.2 When the sheet is unwound at 4 to 50 , cracks should be no more than 10  
mm long and there should be no bonded spots within 1000 mm from the roll 
core.  
 
5.2.3 The padding should be thoroughly permeated without any non -permeated 
spots.  
 
5.2.4 The surface of the sheet should be smooth and free from any holes, nicks, 
edges, cracks or lumps. The mineral granules should be even and consistent 
and firmly bonded with the sheet surface.  
 
5.2.5 Each sheet roll should not have more than one seam. The shorter side should 
not be less than 1000 mm long. The seam should be neatly cut with an added 
length of 1 50 mm.  
 
5.3 Material characteristics  
 
 The material characteristics should conform to the requirements set out in 
Table 2.  
 
Table 2 - Material Characteristics  
 
Specs  
I II Serial 
No Item 
PY G PY G PYG  
3 mm  2100  / 
4 mm  2900  / 
5 mm 3500  1 Soluble (g/m2) 
 
Test phenomenon  / Non-
flammable 
padding  / Non-
flammable 
padding  / 
 110 130 
 mm  2 2 Heat resistance  
Test phenomenon  No dripping or dropping  
-7 -15 3 Low temperature flexibility -  No cracking  
4 Permeability - 30 min  0.3 MPa  0.2 MPa  0.3 MPa  
Maximum peak 
pull (N/50mm)  500 350 800 500 900 
Sub-peak pull 
(N/50mm)  / / / / 800 5 Pull 
Test phenomenon  During the pull test there is no bituminous coating crack or padding 
peeling in the middle area of the sheet.  
Maximum  peak 
elongation %  30 40 / 
6 Elongation  Sub-peak 
elongation %  / / 
/ / 
15   GB 18243 -200x    
PE, S  1.0 
7 Mass increase 
after 
permeation %  
 M 2.0 
Pull retainability % 
 90 
Elongation 
retainability - %  80 
-15 -20 Low temperature 
flexibility -  No cra cking  
Size change - %  0.7 / 0.7 / 0.3 8 Heat aging  
Mass loss - %  1.0 
9 Seam peeling strength  
(N/mm)   1.0 
10 Nail shank tearing strength a N  / 300 
11 Mineral granule adhesion b g  2.0 
12 Lower sheet surface bituminous 
coating thickness c mm  1.0 
Appearance  No slippage, dripping or dropping  
Pull retainability - 
%  80 
-2 -10 13 Artificial 
climate 
accelerated 
aging  Low temperature 
flexibility -  No cracking  
a. Only applicable to single layer sheet for machinery fixed engineering work.  
b. Only ap plicable to sheet with mineral granule surface.  
c. Only applicable to sheet for heat melting engineering work.  
 
6 Test methods  
 
6.1 Standard test conditions  
 
 The standard test conditions are 23±2 . 
 
6.2 Size 
 
Measure the length and width in accordance with GB/T 328.6 ; multiply the 
average values to obtain the sheet size.  
 
6.3 Thickness  
 
Measure the thickness in accordance with GB/T 328.4. For fine sand 
waterproof sheets, remove the sand granules before measuring the sheet 
thickness; for mineral granule waterproof sheets, remove the granules and 
measure the sheet thickness at 60 mm from the edge and using an area of 1 m 
in length.  
 
6.4 Mass per unit area  
 
Measure the weight of the sheet and calculate the mass per unit area (kg/m2) 
with the size obtained in 6.2.  
 
   GB 18243 -200x    
 
6.5 Appearance  
 
The appearance test should be conducted according to GB/T 328.2.  
 
6.6 Test sample preparation  
 
Cut off the first 2500 mm of the sheet and take samples evenly from 1m -long 
sheets according to the method set out in GB/T 328.4. The size and quantity of 
the samples  for the sheet characteristics test are taken according to Table 3.  
 
Table 3 – Size and Quantity of Samples  
 
Serial No  Test Item  Sample size (lengthwise x 
width -wise) mm  Quantity  
Unit 
1 Soluble content  100 × 100  3 
2 Heat resistance  125 × 100  3 lengthwise  
3 Low temperature flexibility  150 × 25  10 lengthwise  
4 Water impermeability  150 × 25  3 
5 Pull and elongation  (250 ~ 320) × 50  5 each lengthwise and 
width -wise 
6 Mass increase after water permeation  (250 ~ 320) × 50  5 lengthwise  
Pull and  elongation retainability  (250 ~ 320) × 50  5 width -wise 
Lowe temperature flexibility  150 × 25  10 lengthwise  7 Heat aging  
Size change and mass loss  (250 ~ 320) × 50  5 lengthwise  
8 Seam peeling strength  400 × 200 (overlapping 
side)  2 lengthwise  
9 Nail shank teari ng strength  200 × 100  5 lengthwise  
10 Mineral granule adhesion  265 × 50  3 lengthwise  
11 Lower sheet surface bituminous coating 
thickness  200 × 50  3 lengthwise  
Pull retainability  120 × 25  5 each lengthwise and 
width-wise 12 Artificial 
climate 
accelerated 
aging  Low temperature flexibility  120 × 25  10 lengthwise  
 
6.7 Soluble content  
 
The test should be conducted according to GB/T 328.26.  
For glass fibre felt products, after the soluble content test place the padding on 
a flame and observe the result.  
 
6.8 Heat  resistance  
 
The test is conducted according to Method A of GB/T 328.11 -2007. There 
should be no dripping or dropping.  
 
6.9 Low temperature flexibility  
 
The test should be conducted according to GB/T 328.14. The curving diameter 
is 30 mm for 3 mm thick sheet, and 50 mm for 4 mm thick sheet and 5 mm 
thick sheet.    GB 18243 -200x    
 
6.10 Water impermeability  
 
The test should be conducted according to Method B set out in GB/T 328.10 -2007. 
Use a 7 -hole tray. The water is taken on the upper surface. For sheets with fine sand 
or mineral gra nules on the upper surface, the water is taken on the lower surface. For 
sheets with fine sand on both surfaces, remove the fine sand along the sealing ring and 
apply No 60 to 100 hot bitumen evenly along the ring; test the water impermeability 
after one h our’s cooling.  
 
6.11 Pull and elongation  
 
The test should be conducted according to GB/T 328.8. The clamp spacing is 200 mm. 
Take the average value of 5 samples lengthwise and width -wise. During the test, 
observe whether there is any peeling between the bitumin ous coating and padding or 
cracking on the bituminous coating in the middle of the sample.  
 
6.12 Mass increase after permeation  
 
6.12.1  Test equipment  
 
6.12.1.1  A sink with lid  
6.12.1.2  A balance with an accuracy of 0.1g  
6.12.1.3  A brush  
6.12.1.4  A ventilating oven with a control accuracy of ±2  
6.12.1.5  A devic e for hanging the samples  
 
6.12.2  Sample processing  
 
For samples to be tested for mass increase after permeation, brush any loosened sand 
granules away from the surface, place the sample in an oven (50 ± 2 ), dry for 24 h 
± 30 min, place the sample in standard co nditions for one hour and then weigh the 
mass (m 1). There should be no contact between the samples during the drying and 
placing. Completely immerse the sample in water (23 ± 2 ) for 7 d ± 1h. To prevent 
sand granules from falling, it is better to place ea ch set of samples separately.  
 
6.12.3  Test procedures  
 
After immersing in water for 7 d ± 1h, remove the sample and fallen sand granules; 
place them under temperature conditions of 23 ± 2  and relative humidity of 50 ± 
5% for 5 h ± 5min. The samples should be hu ng vertically with at least 20 mm 
spacing between each other. Weigh the mass of the sample and its dropped sand 
granules (m 2). 
  
6.12.4  Calculation of results  
 
The mass increase after permeation should be calculated according to formula (1):  
   GB 18243 -200x    
    1002 1×−=mm mW   ................ (1)  
In the formula:  
W – mass increase after the sample processing (%);  
m1 – mass before the sample processing, unit (g);  
m2 – mass after the sample processing, unit (g).  
 
The arithmetic average value from 5 samples is taken as the  test result.  
 
6.13 Heat aging  
 
6.13.1  Test equipment  
 
6.13.1.1  A balance with an accuracy of 0.1g  
6.13.1.2  An oven with a control accuracy of ±2  
6.13.1.3  A vernier calliper with an accuracy of ± 0.02mm  
 
6.13.2  Sample processing  
 
After the size change and mass loss tests the samples can be used in th e width -wise 
pull retainability test and elongation at maximum pull test. New samples may be used 
if there are any disputes.  
 
For the pull retainability test, elongation retainability test, size change test and low 
temperature flexibility test, place the s amples horizontally on a glass plate spread with 
talcum power and then place the samples horizontally in an oven set at 80 ± 2   to be 
kept at this temperature for 10 d ± 1h.  
 
For samples to be tested for mass loss, cut the sample according to 6.6 and then brush 
any loosened sand granules away from the surface; place the sample in an oven (50 ± 
2), drying for 24 h ± 30 min, place  the sample under standard conditions for one 
hour and then weigh the mass (m 1). 
 
The change in size of the sample is tested by measuring the length of the sample (L 1) 
using a vernier calliper . 
 
There should be no contact between the samples during the dry ing and placing of 
them. The mass loss test sample should be placed on separation paper and other 
samples should be placed horizontally on a glass plate spread with talcum power, then 
put the samples horizontally in an oven adjusted at 80 ± 2 , to be kept at this 
temperature for 10 d ± 1h.   
 
6.13.3  Test procedures  
 
After the heating process for 10 d ± 1h, remove the samples and place them under 
standard conditions for 2 h ± 5min.  
 
For the pull retainability test sample, conduct the pull test immediat ely according to   GB 18243 -200x    
6.11.  
 
For the low temperature flexibility test sample, conduct the test immediately, 
according to 6.9.  
 
For the size change test sample, measure the length of the sample (L 2) at the original 
position of measuring L1 immediately . 
 
For the mass loss test sample, weigh the mass of the sample (m 2) immediately.  
 
6.13.4  Calculation of results  
 
6.13.4.1  Pull retainability and elongation retainability  
 
The pull retainability should be calculated according to formula (2):  
 
   Rt = TS’ / TS x 100   ................. .... (2)  
In the formula:  
Rt – the sample’s pull retainability after processing (%);  
TS – the sample’s average value before processing, unit (N/50mm);  
TS’ – the sample’s average value after processing, unit (N/50mm).  
 
Pull retainability is calculated by tak ing the average value of 5 samples.  
 
Elongation retainability is calculated according to formula (2).  
 
For PYG padding products, the pull retainability is calculated by the maximum peak 
value.  
 
For PYG padding products, elongation retainability is calculat ed by the second peak 
elongation.  
 
6.13.4.2  Low temperature flexibility  
 
Record if there are any cracks.  
 
6.13.4.3  Size change  
 
The change in size of each sample is calculated according to formula (3):  
 
   100
12 1×−=
LLLD    ............ (3)  
In the formula:  
D – the s ample’s size change after processing (%);  
L1 – the sample’s length before processing, unit (mm);  
L2 – the sample’s length after processing, unit (mm).  
 
The arithmetic average value of 5 samples is used as the test result.  
 
6.13.4.4  Mass loss    GB 18243 -200x    
 
The mass loss is calcu lated according to formula (4):  
 
   1002 1×−=mm mw   ................ (4)  
In the formula:  
w – the sample’s mass loss after processing, %;  
m1 – the sample’s mass before processing, unit g;  
m2 – the sample’s mass after processing, unit g.  
 
The arithm etic average value from 5 samples is used as the test result.  
 
6.14 Seam peeling strength  
 
The test is conducted according to GB/T 328.20. Use the heat melting method to join 
the sheet lengthwise at the overlapping area. Take the average peeling strength from 5  
samples as the test result.  
 
6.15 Nail shank tearing strength  
 
The test is conducted according to GB/T 328.18. Take the average value from 3 
samples as the test result.  
 
6.16 Mineral granule adhesion  
 
The test is conducted according to Method B in GB/T 328.17 - 200 7. Take the 
average value from 5 samples as the test result.  
 
6.17 Lower sheet surface bituminous coating thickness  
 
Cut the samples according to 6.6 and measure the thickness of the samples in 
accordance with GB/T 328.4. Measure two points, 50mm from the centr e of each 
sample, and take the average value of these two points. Use a hot scraper to remove 
the lower coating in order to reveal the padding and leave it to cool down to standard 
test conditions. Measure the thickness of the original two points of each s ample again 
and take the average value of these two points. The difference between the two 
measured average thicknesses is the bituminous coating thickness of the lower sheet 
surface of this sample. Take the average value from 3 samples as the bituminous 
coating thickness of the lower sheet surface.  
 
6.18 Artificial climate accelerated aging  
 
The test is conducted according to GB/T 18244. Use the xenon arc lamp method. The 
cumulative radiation energy is 1500 MJ/m2 (illuminating time about 720 h).  
 
Check the appe arance of the sample after aging; the pull retainability is tested 
according to 6.11 with clamp spacing of 70 mm and calculated according to 6.13.4.1; 
the low temperature flexibility is tested according to 6.9.  
 
7  Inspection rules    GB 18243 -200x    
 
7.1  Inspection classificatio n 
 
The inspection is classified as the final factory inspection, periodic inspection and 
type inspection.  
 
7.2  Final factory inspection  
 
The items of final factory inspection include: mass per unit area, size, thickness, 
appearance, soluble content, water imp ermeability, heat resistance, low temperature 
flexibility, pull, elongation and lower sheet surface bituminous coating thickness.  
 
7.3  Periodic inspection  
 
The periodic inspection item is aging. This inspection should be conducted at least 
once every 3 months . 
 
7.4  Type inspection  
 
The type inspection items include all requirements stipulated in Article 5. The type 
inspection is conducted under the following circumstances:  
 
a) New product in production or type appraisal;  
b) Annually in normal production;  
c) Change of mate rials or process that could noticeably affect the 
performance of the product;  
d) Considerable difference found between the final factory inspection and the 
last type inspection;  
e) Restarting production after more than 3 months’ suspension of the product;  
f) Nation al quality supervision and inspection authorities request a type 
inspection.  
 
7.5  Batch  
 
Sheets of 10000 m2 of the same type and specs can be a batch and sheets of less than 
10000 m2 can also be a batch.  
 
7.6  Sampling  
 
Take 5 rolls of sheet at random from each b atch at random to conduct the tests of 
mass per unit area, size, thickness and appearance.  
 
7.7  Qualification rules  
 
7.7.1 Single item qualification  
 
7.7.1.1  Mass per unit area, size, thickness and appearance  
 
If all samples from the 5 rolls of sheet meet the requirements set out in 5.1 and 5.2, 
the mass per unit area, size, thickness and appearance qualify. If any one item fails to   GB 18243 -200x    
meet the requirements, the samples from another 5 rolls of the same batch can be 
taken to repeat the failed test. If all tests meet the require ments specified by the 
standard, this batch qualifies; otherwise this batch fails.  
 
7.7.1.2  Material characteristics  
 
Take one roll of sheet at random from the rolls passed the mass per unit area, size, 
thickness and appearance qualification tests to conduct the m aterial characteristics test.  
 
7.7.1.2.1  If the soluble content, pull, elongation, water impermeability, heat 
resistance, seam peeling strength, nail shank tearing strength, mineral 
granule adhesion, lower sheet surface bituminous coating thickness and its 
arithmeti c average value meet the requirements specified by the standard, 
this item qualifies.  
 
7.7.1.2.2  If all 3 samples meet the water impermeability requirement specified by 
the standard, this item qualifies.  
 
7.7.1.2.3  If both sides of the sheet meet the low temperature flexibili ty requirement 
specified by the standard, this item qualifies.  
 
7.7.1.2.4  If all results from the heat aging, artificial climate accelerated aging tests 
meet the requirement in Table 2, this item qualifies.  
 
7.7.1.2.5  If the test results of all items meet the requirements set  out in Table 2, the 
material characteristics of this product batch qualify. If any one item fails 
to meet the requirements, take another 5 rolls of sheet at random from this 
batch and repeat the failed item test on one of these 5 rolls. If the test 
meets the requirements specified by the standard, the material 
characteristics of this batch qualify.  
 
7.7.2 General qualification  
 
If the test results meet all requirements specified in Article 5, this product batch 
qualifies.  
 
8  Markings, packaging, storage and tran sportation  
 
8.1  Markings  
 
The outer packaging of the sheet material should include:  
 
- Name and address of manufacturer;  
- Trademark;  
- Product label;  
- Applicable for heat melting process or not;  
- Date of production or batch number;  
- Qualification logo;  
- Production lic ence number and its logo.  
   GB 18243 -200x    
8.2  Packaging  
 
The sheet materials can be packed using paper, plastic tape, box or plastic bag. The 
roll should be cylindrically wrapped with both of the unpacked ends measuring less 
than 100 mm in total. Storage and transportation notes should be marked on the 
packaging or included in the product leaflet.   
 
8.3  Storage and transportation  
 
8.3.1 Storage  
 
During storage and transportation, products of different type and specification should 
be stored separately without mixing. Avoid exposure to direct sunlight and do not 
leave in rain. Attention should be paid to ventilation. The storage temperature should 
not be higher than 50 . Vertical storage can only be in single layer and vertical 
stacking should not be more than two stacks during transp ortation.  
 
8.3.2 Transportation  
 
Pressure on the roll or against the roll should be avoided during transportation and, if 
necessary, the tilt should be used.  
 
 
8.3.3 Storage shelf life  
 
Under normal storage and transportation conditions, the storage shelf life is on e year 
from the production date.  
 
 
_______________________________