JG/T 26-2002 Inorganic building coating for external wall
1 Scope
This standard specifies the technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of inorganic building coatings for exterior wall of buildings.
This standard is applicable to inorganic building coatings, with alkali metal silicates or silica sol as the main binders, for exterior wall. These coatings are applied by brushing, spraying or roller coating to form thin decorative coatings on the exterior wall of buildings.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, all editions cited are valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below.
GB/T 1596-1991 Fly ash used for cement and concrete
GB/T l728-1979 Methods of test for drying time of coatings of paints and putties
GB/T 1733-1993 Determination of resistance to water of films
GB/T 1766-1995 Paints and varnishes - Rating schemes of degradation of coats (neq ISO 4628:1980)
GB/T 1865-1997 Paints and varnishes - Artificial weathering and exposure to artificial radiation - Filtered xenon-arc radiation (eqv ISO 11341: 1994)
GB 3186-1982 Sampling paint products (neq ISO 1512:1974)
GB/T 6682-1992 Water for analytical laboratory use - Specification and test methods
GB/T 9265-1988 Determination for alkali resistance of film of architectural paints and coatings
GB/T 9266-1988 Determination of scrub resistance of film of architectural paints and coatings
GB/T 9270-1988 Determination of contrast ratio of light colored paints (using polyester film) (eqv ISO 3906:1980)
GB/T 9278-1988 Temperatures and humidities for conditioning and testing of paint specimens (eqv ISO 3270:1984)
GB/T 9750-1998 Marks for package of coating products
GB/T 13491-1992 General rule for packing of coatings
GB/T 15608-1995 The Chinese color system
JG 412-1991 Asbestos cement sheet for building
JG/T 23-2001 The preparation of plate specimens for testing of building paints and coatings
JG/T 25-1999 Determination for freeze-thaw resistance of film of building coatings
3 Product classification and model
3.1 Classification
Inorganic building coating for external wall can be classified as follows according to the types of main binders:
Type I: Alkali metal silicate type - formulated with potassium silicate, sodium silicate and other alkali metal silicates as the main binders, and supplemented with pigments, fillers and additives.
Type II: Silica sol type - formulated with silica sol as the main binder, along with an appropriate amount of synthetic resin emulsion, pigments, fillers and additives.
3.2 The model of inorganic building coatings for exterior wall is composed of the name code, characteristic code, main parameter code and modification number:
Modification number (in sequence of capital Chinese pinyin letters ABC...)
Main parameter code: artificial aging resistance, h.
Characteristic code; Type I: S; Type II: R
Name code: inorganic building coatings for exterior wall WJT.
3.3 Designation example
Type I inorganic building coatings for exterior wall, with an artificial aging resistance of 800h.
Designated as: WJT S 800
Type II inorganic building coatings for exterior wall, with an artificial aging resistance of 500h.
Designated as: WJT R 500
4 Technical requirements
The technical indexes of product shall meet those specified in Table 1.
Table 1 Technical indexes of product
Item Technical index
Status in container Without caking and it is uniform after stirring
Workability Easy for brushing the second pass
Film appearance Coating appearance is normal
Contrast ratio (white and light color1)) ≥0.95
Thermal storage stability (30d) No phenomenon of caking, coagulation or mold
Low temperature storage stability (3 times) No phenomenon of caking or coagulation
Track-free time (h) ≤2
Scrub resistance (time) ≥1,000
Water resistance (168h) No bubbling, cracking or peeling; slight powder shedding is allowed
Alkali resistance (168h) No bubbling, cracking or peeling; slight powder shedding is allowed
Temperature variation resistance (10 times) No bubbling, cracking or peeling; slight powder shedding is allowed
Stain resistance (%)
I
II ≤20
≤15
Artificial ageing resistance (white or light color 2))
(1 800)h
(1 500)h No bubbling, cracking or peeling; pulverization ≤ Grade 1; discolouration ≤ Grade 2
No bubbling, cracking or peeling; pulverization ≤ Grade 1; discolouration ≤ Grade 2
1), 2) Light color refers to the color of film (such as gray, pink, cream yellow, light green, etc. ) formed by the light-color coating which is prepared by white coating (main component) and color paste (proper amount); its brightness is 6 to 9 according to the requirements of GB/T 15608-1995, 4.3.2.
Foreword II
1 Scope
2 Normative References
3 Product classification and model
4 Technical requirements
5 Test methods
6 Inspection rules
7 Packaging, marking, transportation and storage
Annex A (Normative) Test method for stain resistance of coating layer
