ICS 91.120.30  
Q17  
GB 
 
National Standards of the People’s Republic of China  
 
GB 18242 – 200X  
Replaces GB 18242 - 2000   
 
 
 
 
 
Styrene butadiene styrene (SBS) 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 (S AC)        GB 18242 -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. Reinforced bitumen sheets for roof waterproofing – Definitions and 
characteristics .” 
 
This Standard replaces GB 18242 – 2000 “Styrene butadiene styrene (SBS) modified 
bituminous sheet materials).”  
 
The main changes to this Standard when compared with GB 18242 – 2000 are as 
follows:  
 
- Glass fibre enhanced fe lt 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 version);  
- 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- Roll weight has been replaced by mass per unit area (4.1 in version 2000; 4.1 in 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 elon gation, mass increase after water permeation, 
heat aging, oil permeability, seam peeling strength, nail shank tearing strength, 
mineral granule adhesion, lower sheet bituminous coating thickness of sheet 
surface are added in Material Characteristics (Table  3 in version 2000; Table 2 
in this version);  
-  Pull has been revised and tearing strength 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 Sta ndard 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: Chinese Construction Industry 
Association of Waterproof Materials, Construction Material Industry Technical 
Supervision and Research Centre, Suzhou Waterproof Material Research and Design 
Institute of China Chemical Construction Material Corporation.  
 
The units that participated in drafting this Standard are: Beijing Ori ental Rainbow 
Waterproof Technology Corp. Ltd, Xuzhou Woniushan New Waterproof Materials 
Co. Ltd, Panjin Yuwang Waterproof Materials Group Co. Ltd, Yizhong (Qingdao) 
I   GB 18242 -200x    
Chemical Construction Materials Co. Ltd, Weida (Jiangsu) Construction Materials Co. 
Ltd, S oprema (Shanghai) Building Materials Trading Co. Ltd, Baoding North 
Waterproof Engineering Company, Wenzhou Great Wall Waterproof Materials 
Factory, Dongying Daming Waterproofing Co. Ltd, Dalian Xiyang Waterproof 
Engineering Group Ltd, Gessmann (Shanghai )  Non -woven Fabric 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, Guangdong Shunhua Chemical Industry Co. Ltd, 
Shanghai Construction Waterproof Materials (Group) Corporation, Weifang City 
Hongyuan Waterproof Materials Co. Ltd, Weifang City Yuhong Waterproof 
Materials Group Limited, Weifang City Chenming New Waterproof Materials Co. 
Ltd, Panjin Dayu Waterproof Building Materials Co. Ltd, Suzhou Lixing Waterproof 
Materials Co. Ltd, Hubei Yeongyang Waterproof Materials Co. Ltd, Tangshan 
Desheng Waterproof Materials Co. Ltd, Feudenberg Baolide (Shanghai) Trading Co. 
Ltd, Shaanxi Changyan Property Co. Ltd, Ningbo Yi nzhou Jinsong Waterproof 
Materials Plant, Xinxiang Riyue Waterproof Technology Co. Ltd.  
 
The main drafters of this Standard are: Zhu Zhiyuan, Yang Bin, Zhu Dongqing, Duan 
Wenfeng, Zhan Fumin, Li Guogan, Chen Bin Meng, Zhu Xiaohua, Li Ling, Liu 
Huandi, Fan  Xi Yang and Zheng Jiayu.  
 
The interpretation of this Standard is assigned to Suzhou Waterproof Materials 
Research  Institute.  
 
This Standard was first issued in 2000.  
 
II   GB 18242 -200x    
   GB 18242 -200x    
Styrene butadiene styrene (SBS) modified bituminous sheet materials  
 
1 Scope  
 
This Sta ndard sets the classifications, technical requirements, test methods, inspection 
rules , markings and user manual requirements for  styrene butadiene styrene modified 
bituminous sheet materials (abbreviated as SBS waterproof sheet).  
  
This Standard  applies to waterproof sheets made from the padding of polyester felt, 
glass fibre felt or enhanced glass fibre polyester felt, by the bitumen modifier of 
styrene butadiene styrene (SBS) thermoplastic elastomer and coated on both sides 
with insulation materials . 
 
2 Normative References  
 
The provisions of the following documents 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 methods 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 
straightness  
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 waterproofing – 
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 met hods 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 waterproofing – 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 18242 -200x    
GB/T 328.26  Test methods for building sheets for waterproofing – Part 26: 
bitumen sheets for waterproofing – Dissoluble content (coating 
material content)  
GB/T 18244  Test methods for resistance to weathering of building 
waterpr oof materials  
GB/T 18840  Padding for bituminous waterproof sheets   
JC/T 904   Elastomer modified bitumen  
 
3 Classification 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 i s 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 sheet size is 7.5 m2, 10m2, 15m2. 
 
3.3 Labelling  
 
The product is labelled in the foll owing sequence: name, model, padding, 
upper surface 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 gra nules and lower 
surface of polyethylene coating polyester 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 waterpro of engineering work.  
   GB 18242 -200x    
3.4.2 Glass fibre enhanced polyester felt sheets can be used in machinery fixed 
single layer waterproof sheets subject to wind load resistance testing.  
 
3.4.3 The glass fibre sheets are suitable for the bottom layer in multi -layer 
waterproof work . 
3.4.4 The waterproof sheets with the upper surface insulating material of opaque 
mineral granules are suitable for exposed application.   
 
3.4.5 The waterproof sheets with the surface insulation material of fine sand are 
used in underground waterproof work.  
 
4 Raw mat erials  
 
4.1 Modified bitumen  
  
 Modified bitumen should conform to the requirements of JC/T 905.  
 
4.2 Padding  
 
4.2.1 Only polyester felt, glass fibre felt and glass fibre enhanced polyester felt are 
used as padding.  
 
4.2.2 The application of polyester felt and glass fibre fe lt 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 material s 
 
Polyester (PET) coating and heat resistant 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 
Thickness 
mm Average value 
 3.0 4.0 5.0   GB 18242 -200x    
Minimum unit 
value  2.7 3.7 4.7 
 
5.2 Appearance  
 
5.2.1 The sheet should be rolled up tightly and neatly. Inward and outward 
unevenness a t 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 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. T he shorter side should 
not be less than 1000 mm long. The seam should be neatly cut with an added 
length of 150 mm.  
 
5.3 Material characteristics  
 
 The material characteristics should conform to the requirements set out in 
Table 2.  
 
Table 2 - Material Charact eristics  
 
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  / 
 90 105 
 mm  2 2 Heat resistance  
Test phenomenon  No dripping  or dropping  
-20 -25 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.    GB 18242 -200x    
Maximum peak 
elongation %  30 40 / 
6 Elongation  Sub-peak 
elongation %  / / 
/ / 
15 
PE, S  1.0 
7 Mass increase 
after 
permeation %  
 M 2.0 
Pull retainability % 
 90 
Elongation 
retainability - %  80 
-15 -20 Low temperature 
flexibility -  No cracking  
Size change - %  0.7 / 0.7 / 0.3 8 Heat aging  
Mass loss - %  1.0 
9 Oil 
permeability  Number of sheet  2 
10 Seam peeling strength  
(N/mm)   1.5 
11 Nail shank tearing strength a N  / 300 
12 Mineral granule adhesion b g  2.0 
13 Lower sheet surface bituminous 
coating thickness c  mm  1.0 
Appearance  No slippage, dripping or dropping  
Pull retainabili ty - 
%  80 
-15 -20 14 Artificial 
climate 
accelerated 
aging  Low temperature 
flexibility -  No cracking  
a. Only applicable to single layer sheet for machinery fixed engineering work.  
b. Only applicable to sheet with mineral granule surface.  
c. Only applicable to sheet for heat melting engineering  work.  
 
6 Test method  
 
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 328.6l; multiply the 
average values to obtain the sheet size.  
 
6.3 Thickness  
 
Measure the thickness in accordan ce 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.  
 
 
   GB 18242 -200x    
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.  
 
6.5 Appearance  
 
 The test should be conducted according to GB/T 328.2.  
 
6.6 Test sample preparation  
 
Cut off the first 250 0 mm of the sheet and take the samples evenly from 1 m 
long sheets according to the method 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  
 
Seria l 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 × 150  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 each lengthwise and 
width -wise 
Lowe temperature flexibility  150 ×  25 10 lengthwise  7 Heat aging  
Size change and mass loss  (250 ~ 320) × 50  5 lengthwise  
8 Oil permeability  50 × 50  3 
9 Seam peeling strength  400 × 200 (overlapping 
side)  2 lengthwise  
10 Nail shank tearing strength  200 × 100  5 lengthwise  
11 Mineral granule adhesio n 265 × 50  3 lengthwise  
12 Lower sheet surface bituminous coating 
thickness  200 × 50  3 lengthwise  
Pull retainability  120 × 25  5 each lengthwise and 
width -wise 13 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 G B/T 328.11 -2007. There 
should be no dripping or dropping.  
   GB 18242 -200x    
6.9 Low temperature flexibility  
 
The test should be conducted according to GB/T 328.14. The curving diameter 
is30 mm for 3 mm thick sheet and 50 mm for the 4 mm thick sheet and 5 mm 
thick sheet.  
 
6.10 Water  impermeability  
 
The test should be conducted according to Method B of 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 granules 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 hour’s cooling.  
 
6.11 Pull and elongation  
 
The test should be conducted a ccording 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 bituminous coating and padding or 
cracking on the bituminous coating in th e 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 device for hanging the samples  
 
6.12.2  Sample processing  
 
For samples to be tes ted 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 conditions 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 each set of samples separately.  
 
6.12.3  Test procedure  
 
After immersi ng in water for 7 d ± 1h, remove the sample and fallen sand granules, 
place them under temperature conditions of 23 ± 2  and relative humidity at 50 ± 
5% for 5 h ± 5min. The samples should be hung vertically with at least 20 mm 
spacing between each other.  Weigh the mass of the sample and the fallen sand 
granules (m 2).   GB 18242 -200x    
  
 
6.12.4  Result calculation  
 
The mass increase after permeation should be calculated according to formula (1):  
 
    1002 1×−=mm mW   ................ (1)  
In the formula:  
W – mass inc rease 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 ac curacy 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 the 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 samples 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.  
   GB 18242 -200x    
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 immediate ly according to 
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 m ass loss test sample, weigh the mass of the sample (m 2) immediately.  
 
6.13.4  Result calculation  
 
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 – sample’s pull retainability after processing, %,  
TS – sample’s average value before processing, unit N/50mm;  
TS’ - sample’s average value after processing, unit N/50mm.  
 
The pull retainability is calculated with the average value o f 5 samples.  
 
The 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 calculated by the second pe ak 
elongation.  
 
6.13.4.2  Low temperature flexibility  
 
Record if there are any cracks.  
 
6.13.4.3  Size change  
 
The size change of each sample is calculated according to formula (3):  
 
   100
12 1×−=LLLD    ............ (3)  
In the formula:  
D – the sample’s size change af ter processing (%);    GB 18242 -200x    
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  
 
The mass loss is calculated according to for mula (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 arithmetic average value fro m 5 samples issued as the test result.  
 
6.14 Oil permeability  
 
6.14.1  Equipment  
 
6.14.1.1  An oven with a control accuracy of ±2  
6.14.1.2  Filter paper – medium speed qualitative filter paper  
 
6.14.2  Sample preparation  
 
Remove the PE coating or find sand on the lower surface from the samples, refer to 
GB/T 328.11 for the removal method.  
 
6.14.3  Test procedure  
 
Place the processed samples separately on fi ve-layer filter paper larger than the 
samples, which is placed on glazed tiles, put a weight of 1 kg on each sample and 
place them horizontally in an oven adjusted to the specified heat resistance 
temperature for 5 h ± 15min. Then place them under standard  test conditions for 1 h, 
checking how many layers have been permeated.  
 
6.14.4  Calculation of results  
 
Filter paper with any stains will be treated as permeated. The highest permeated layer 
from 3 tests will be used as the test result.  
 
6.15 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.  
   GB 18242 -200x    
6.16 Nail shank tearing strength  
 
The test is conducted accordi ng to GB/T 328.18. Take the average value from 3 
samples as the test result.  
 
6.17 Mineral granule adhesion  
 
The test is conducted according to Method B in GB/T 328.17 - 2007. Take the 
average value from 5 samples as the test result.  
 
6.18 Lower sheet surface bitumi nous coating thickness  
 
Cut the samples according to 6.6 and measure the sample’s thickness in line with 
GB/T 328.4. Measure two points, 50 mm from the centre of each sample and take the 
average value of these two points. Use a hot scraper to remove the lo wer 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 sample 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.  
 
6.19 Artificial climate accelerated aging  
 
The test is con ducted 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 appearance of the sample after aging; the pull retainability is tested 
according to 6.11 with clamp spa cing of 70 mm and calculated according to 6.13.4.1; 
the low temperature flexibility is tested according to 6.9.  
 
7  Inspection rules  
 
7.1  Inspection classification  
 
The inspection is classified as final factory inspection, periodic inspection and type 
inspectio n. 
 
7.2  Final factory inspection  
 
The items of final factory inspection include: mass per unit area, size, thickness, 
appearance, soluble content, water impermeability, heat resistance, low temperature 
flexibility, pull, elongation, oil permeability and lowe r sheet surface bituminous 
coating thickness.  
 
7.3  Periodic inspection  
 
The periodic inspection item is aging. The inspection should be conducted at least 
once every 3 months.  
   GB 18242 -200x    
7.4  Type inspection  
 
The type inspection items include all requirements stipulated in  Article 5. The type 
inspection is conducted in the following circumstances:  
 
a) New product in production or type appraisal;  
b) Annually in normal production;  
c) Change of materials or process that could noticeably affect the product 
performance;  
d) Considerable diff erence found between the final factory inspection and the 
last type inspection;  
e) Restarting production after more than 3 months’ suspension of the product;  
f) National 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. Sheets of less than 
10000 m2 can also be a batch.  
7.6  Sampling  
 
Take 5 rolls of sheet at random from each batch to conduct the tests of mass per unit 
area, size, thickness and appearance.  
 
7.7  Qualification r ules 
 
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 are qualified. If any one ite m 
fails to 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 requirements specified by the 
standard, this batch is qualified; otherwise this batch fails.  
 
7.7.1.2  Material charac teristics  
 
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 material 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 
arithmetic average value meet the requirements specified by the standard, 
this item qualifies.  
 
7.7.1.2.2  If all 3 sam ples meet the water impermeability requirement specified by 
the standard, this item qualifies.  
   GB 18242 -200x    
7.7.1.2.3  If both sides of the sheet meet the low temperature flexibility requirement 
specified by the standard, this item qualifies.  
 
7.7.1.2.4  If the maximum value of oil permeab ility meets the requirement specified 
by the standard, this item qualifies.  
 
7.7.1.2.5  If all results from the heat aging, artificial climate accelerated aging tests 
meet the requirement in Table 2, this item qualifies.  
 
7.7.1.2.6  If the test results of all items meet the req uirements set out in Table 2, the 
material characteristics of this product batch qualify. If any one item fails 
to meet the requirement, randomly take another 5 rolls of sheet from this 
batch and repeat the failed item test on one of these 5 rolls. If the test 
meets the requirement 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 transportation  
 
8.1  Markings  
 
The outer package 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;  
- Product ion licence number and its logo.  
 
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 transpor tation 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 types and different 
specifications 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   GB 18242 -200x    
temperature should not be higher than 50 . Vertical storage should only be in single 
layers and during transportation should only be stacked in double layers.  
 
 
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 one year 
from the production date.  
 
 
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