Appearance quality

    Natural granite and natural marble building boards in decorative effect on the actual problem is most likely problem of chromatic aberration , saying the color in the stone is called the standard tone pattern is to reconcile , are indicators of a quality appearance . Appearance quality also includes cosmetic defects , means lack of edge , chipping , cracks, stains, color line , pit nest, marble and warping , dents , stains and other defects in appearance .

    In natural granite and marble exterior building panels standard quality indicators required , the same pattern should be the basic tone plates reconcile , superior product appearance defects are not allowed .

    Defect detection method , will be seized sheet flat on the ground , 1.5 m away from the plate visible defects as defective ; 1.5 m away from the plate is not obvious, but in the visible defects at 1 m considered to have no obvious defects ; 1 meter away from the plate as invisible defect defect . Because natural stone color issues prevalent , so users in selected varieties of stone after it is best to choose the right protocol plate when ordering large quantities but also to the case. Agreement as to a large number of plates , to fully display the variety of tone patterns. Agreement with the {TodayHot} board should be concerned when you let each holding one , in order to harmonize standards to avoid unnecessary disputes .

    For specular gloss gloss mirror plate is a very important indicator. Means the plate surface gloss finishes degree of reflection of visible light . Standard in the stone , the gloss is called specular gloss . Existing natural granite standards, the front mirror plate should have a specular gloss , can clearly reflect the scene . Specular gloss mirror sheet value should not be less than 75 gloss units , or the agreement between the model execution. Gloss standard minimum value is a base value , most granite sheet gloss value of 80 to 90 gloss units, the specular gloss was good . Therefore, the user can according to their different requirements, specified in the purchase contract should reach a value gloss , or gloss values ​​agreements plate as standard . The newly revised national standards of natural granite , has the lowest value gloss gloss units increased from 75 to 80 gloss units .

    The current standard natural marble gloss value of a classification , and glossiness of the same level of the minimum value is also a main component by chemical differ . Excellence lowest gloss value varies according to the chemical composition is divided into three main categories, namely 90,80,60 gloss units . The standard value is fully taken into account to determine the chemical composition of the polishing process of the main effects , combined with a large number of trials established . Currently on the market with imported marble marble slabs based, and basically ovo enter the market in the form of light board , and then cut according to the different requirements of various engineering board . According to recent test results , these marble gloss mirror plate can basically meet the requirements of the standard .

    Processing quality

    Stone processing stone finishes directly affects the quality of the decorative effect , but also the main basis for classification of stone . These specifications are standard size deviation ( length deviation , width deviation , thickness deviation ) , flatness tolerances, angle tolerance . Technical indicators based on these deviations and tolerance limits of the sheet is divided into superior products, first-class products, qualified . Users can according to their actual situation, as specified in the purchase contract to reach the level , avoid the use of " national standards " and other words of general products , you can ask the supplier of the {HotTag} product inspection reports issued each batch of products . Note that each batch of products, superior product if it is not allowed to have more than 5 % of the first-class products exist, if there is a first-class product is not allowed to exceed 10 % of the qualified products exist, if there is a qualified product is not allowed to exceed 10 % of nonconforming product exists.

    The physical properties of the physical properties of the stone is the stone of the most important indicators of safety performance indicators, especially the exterior stone, especially high-rise hanging stone , will directly affect the personal and property safety . Physical properties often refers to the bulk density, water absorption, dry compressive strength, bending strength 4, only these four tests are generally carried out in a professional quality inspection center . Granite, marble blocks have strict standards and standard sheet provides specific indicators , which reflect the natural stone material itself is an important indicator . User response requires the supplier to provide each batch of plates physical performance test reports , or self- sample test to avoid some of the weathered material and the low strength of the stone wall hanging , a security risk .

    National mandatory standard GB6566-2001 " Limit of radionuclides in building materials " Since July 1, 2002 came into effect , the standard radioactive stone will be divided into A, B, C categories , the table below:

    Radioactive categories ( classes )

    IRa internal exposure index

    Ir external exposure index

    Scope of use

    A

    ≤ 1.0

    ≤ 1.3

    Its marketing and use of unrestricted

    B

    ≤ 1.3

    ≤ 1.9

    Not be used for housing, hospitals , schools , kindergartens and other Class I civil interior surface can be used for Class I civil outer finishes and some other buildings and external finishes

    C

    ≤ 2.8

    Can only be used outside the building finishes and other outdoor uses

    ≥ 2.8

    Only be used steles , seawalls, piers and other places related to humans rarely