JC/T 973-2005 English PDF (JCT973-2005)

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JC/T 973-2005: Natural stone protector for building decoration
JC/T 973-2005
BUILDING MATERIAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.20
Q 21
Registration number: 15245-2005
Natural stone protector for building decoration
ISSUED ON: FEBRUARY 14, 2005
IMPLEMENTED ON: JULY 01, 2005
Issued by: National Development and Reform Commission of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Product classification and naming marks ... 5 
5 Technical requirements ... 7 
6 Test methods ... 8 
7 Inspection rules ... 9 
8 Marking, packaging, storage, transportation ... 10 
9 Safety coating and protection ... 10 
Appendix A (Normative) Test method of waterproofness ... 12 
Appendix B (Normative) Test method of stain resistance ... 14 
Appendix C (Normative) Test method for reduction rate of cement’s bond
strength ... 16 
Appendix D (Normative) Test method of acid resistance ... 19 
Appendix E (Normative) Test method of alkali resistance ... 21 
Appendix F (Normative) Test method of UV-aging resistance ... 23 
Natural stone protector for building decoration
1 Scope
This standard specifies the terms and definitions, classification and naming
marks, technical requirements, test methods, inspection rules, marking,
packaging, storage and transportation, safe coating and protection of natural
stone protectors.
This standard applies to the natural stone protector for building decoration.
2 Normative references
The provisions in following documents become the provisions of this standard
through reference in this standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this standard;
however, parties who reach an agreement based on this standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB 3186 Sampling paint products
GB/T 9966.3-2001 Test methods for natural facing stones - Part 3: Test
methods for bulk density, true density, true porosity and water absorption
GB/T 13890 Terms for natural facing stone
GB 18581 Indoor decorating and refurbishing materials - Limit of harmful
substances of solvent based coatings for woodenware
GB 18582 Indoor decorating and refurbishing materials - Limit of harmful
substances of interior architectural coatings
JC/T 902 Silicone hydrophobic agent for construction surfaces
3 Terms and definitions
The terms and definitions as established by GB/T 13890 as well as the following
terms and definitions apply to this standard.
3.1
6 Test methods
6.1 pH
Use a precision pH test paper to make determination.
6.2 Stability
Take two sets of 10 mL of sample. Respectively put it into two test tubes. Place
them on opposite sides of the electric centrifuge. Rotate it at 3000 r/min for 5
min. Take out the test tube, to see if there is delamination, floating oil,
precipitation.
6.3 Waterproofness
See Appendix A.
6.4 Stain resistance
See Appendix B.
6.5 Reduction rate of cement’s bond strength
See Appendix C.
6.6 Acid resistance
See Appendix D.
6.7 Alkali resistance
See Appendix E.
6.8 UV-aging resistance
See Appendix F.
6.9 Impermeability
Flatly place the five 150 mm x 150 mm x 20 mm stones, whose bottom and four
sides are protected according to A.3.1 to A.3.3 in Appendix A, in the top of a
container (wide-edge box which has a volume of 160 mm x 160 mm x 25 mm,
lined with 240 mm x 240 mm plastic film) which contains cement mortar (cement
and sand are prepared in the proportion of 1:2.5 by the use of water). Make its
bottom face downwards. Allow the cement mortar to reach about 1/2 of the
stone’s thickness. Use plastic tape to seal the exposed part at the sides of stone
and the periphery of the container. Let it be standing for seven days. At the
interval of one day, observe the color change and the presence of water mark
7.2 Type inspection
7.2.1 Inspection items
All the items in clause 5 of technical requirements.
7.2.2 Inspection conditions
In one of the following cases, carry out type inspection:
a) When the new product is initially type-finalized;
b) When there is a major change in product’s formulation, process, raw
materials;
c) When the production is restored after suspension for more than half a year;
d) Once a year during normal production;
e) When the national quality supervision agency proposes to carry out type
inspection requirements.
7.2.3 2 Group-batch
Same as exit-factory inspection.
7.2.4 Sampling
Same as exit-factory inspection.
7.2.5 Determination
If one of the test results does not meet the requirements of clause 5, the batch
of products is judged to be unqualified.
8 Marking, packaging, storage, transportation
The marking, packaging, storage, transportation of the product shall be in
accordance with the provisions of clause 7 of JC/T 902.
9 Safety coating and protection
9.1 When applying coating, try to choose the brushing method and carry it
outdoors. If it is indoors, it must be well ventilated.
9.2 When applying coating, the construction personnel shall wear the
necessary protective equipment.
Appendix A
(Normative)
Test method of waterproofness
A.1 Equipment and appliances.
A.1.1 Drying oven: The temperature can be controlled within the range of 60 °C
± 2 °C.
A.1.2 Balance: The maximum weighing is 1000 g. The sensitivity is 10 mg.
A.1.3 Dryer.
A.2 Specimen
Take 14 pieces of natural stone sample of 100 mm x 100 mm x 20 mm (it is
recommended to use the G3503 natural granite).
A.3 Test procedures
A.3.1 Prepare the protector according to the protector’s instruction manual or
the requirements of the entrusting organization.
A.3.2 Use 0.25 mm silicon carbide sand to grind the six sides of the specimen
smoothly. Use clean water to rinse it. Place it in a drying oven at 60 °C ± 2 °C
to dry it for 48 h. Take it out. Place it in a desiccator to cool it to room temperature.
Store 5 of them in a desiccator as control samples. Take the other 9 of them as
test samples.
A.3.3 Take 9 test samples. Use a brush which is fully coated with protector to
apply uniform coating for the six surfaces of the test sample. Flatly place it in a
porcelain plate which is paved with glass rod at the bottom. Dry it naturally at
room temperature for 1 h. Place the surface of the stone in contact with the
glass rod upwards. Continue to dry it at room temperature for 1 h. Follow the
procedures above to apply another course of coating. Let it be naturally dried
at room temperature which has a humidity of not more than 60% for 48 h.
A.3.4 Make the control sample and test sample be subjected to the water
absorption rate test and calculation according to the requirements of 4.1.1,
4.1.2, 5.2 of GB/T 9966.3-2001. The drying temperature is 60 °C ± 2 °C.
Respectively calculate the average value of water absorption rate of the control
sample and the test sample.
A.4 Calculation of results
Appendix B
(Normative)
Test method of stain resistance
B.1 Vessel
B.1.1 Drying oven: The temperature can be controlled within the range of 60 °C
± 2 °C.
B.1.2 25 mL dropper bottle.
B.1.3 Dryer.
B.2 Contaminant reagent
B.2.1 Edible vegetable oil.
B.2.2 Blue-black ink.
B.3 Specimen
Take 12 pieces of natural stone sample of 100 mm ...