Construction Materials Inspection in China: A Guide to Asian Importers
Construction Materials Inspection in China for Tiles, Sanitary Item and Lavatory plays an important role in importation and exportation. Different construction material categories have different quality standards to be met by manufacturers, importers and exporters. Here are few things to know about Quality Inspection of Construction Materials.
Quality Inspection for Tiles
Quality Inspection for Tiles in China compose of different measurements such as (sizes are in centimeters) 80 x 80, 60 x 60, 60 x 30, 60 x 10 and 30 x 30. Tiles are meticulous when it comes to quality inspection, different quality measures is being established such as:
Shade or “Tone” Variation
Shade or “Tone” variation is not a tiles factory defect in production it just represents a lapse in selection process. Shade or “Tone” variation usually occurs almost every production run and selection of tiles are designed to separate the products to every shade. Shade number or code is usually placed in the packaging or box of ceramic tiles, this could be a guide to know the shade or “tone” of the ceramic tiles.
Dimensions: Sizes and Thickness
Tiles have various sizes and thickness which should result a good quality that matches sizes perfectly. In an ISO13006 standard list, the maximum size variance for tiles as being 1% of the length (max. 2 mm for cushion edge tile) which is applied to a large tile the 2 mm is equivalent to a 600 mm tile to a maximum variation of +/- 0.33% in size. The thickness of tiles are not very evident in occurrence since the modern dust-pressed manufacturing of tiles has this very rare kind of defect.
Squareness or Rectangularity and Shape
This kind of defect in tile is the easiest to spot because in a certain panel the lines between each tile should evidently show that no changes in gap sizes. In ISO13006, specified in the standard that the maximum rectangularity deviation is +/- 1% of the edge length.
Tile Curvature or Tile Bowing Effect
Tile Curvature or Tile Bowing Effect is the most common tile defect resulting to a lipping or curving of tile surface when comparing to another sample. Tile should be flat and uniformed in size to attain quality in ISO13006 the maximum deviation of square edge is +/- 0.5% of tile length. Example if you have a 400 mm x 400 mm tile the gap between the straight edge should cannot be more than 2 mm.
Tile have a natural property to ease cleaning, upon production a certain formulation of wax and dust are being applied to polished or matte surface of it. Engobe a dust like film that merely occurs as excess , it is easy to wipe and does not harm the back of the tile. Transit Wax is often applied to tile surface by factory to protect during shipment or transportation.
Moisture Content or “Water Absorption”
The water absorption of tile play a big role in tile quality. The higher the water absorption the brittle the tile is, the lower the water absorption the more durable it is. Which is express in mass of water per unit mass.
Quality Inspection of Sanitary and Lavatory
Quality Inspection of Sanitary and Lavatory Wares in China have many different kinds of defects which can be easily noticed and measured by naked eye and use of simple measuring tool such as steel meter or caliper, these includes the following:
Cracks – separation or split of sanitary and lavatory wares without breaking apart
Blisters – sharp edge burst bubbles in fired ware.
Crazing – crack inside a glazed surface area.
Pinhole – small holes in the ware.
Poor Finish – improperly finished ware at green stage which can be found after firing
Chippings – small broken pieces of ware
Light Glaze – lesser glaze ware than necessary.
Heavy Glaze – more glaze than necessary.
Leakage – leak found after running in water.
Pitting – small pit found in glaze after firing.
Mate Glazed – improperly fired glazed.
Warphage – bending in ware.
Color Fading – discoloration or color fading in ware.
Bloating – gas bubble trapped after glazing.
Blown out – impurities burns out during firing.
Dunting – Crack formed at silica inversion stage and the glaze filled the crack.
Peeling – Glaze peel/lift away from the body.
Pre- shipment Inspection of Construction Materials in China
Construction Materials in China such as Tiles, Sanitary and Lavatory wares are fragile and can be easily broke by mis-handling and improper packaging. To prevent this kind of quality lapses, pre-shipment inspection in container loading supervision is being conducted to reduce the risk of: broken, defective and incomplete components of tiles or wares. Tiles is shipped completely and intact per pallet and packaged per box by different number of pieces depending on its sizes. Sanitary and Lavatory wares is shipped in good running condition, complete components and excellent quality. Theses wares is shipped per box and loaded to delivery truck/container, to avoid impact of humps pallets can be placed to the surface of delivery truck/container before the pilling of wares. Securing the accuracy of delivery can reduce the occurrence of Item Returns and Back loads.
Hope this article was useful to you. If you have any question about Construction Materials Inspection in China and Asia, fell free to post a comment or contact us by clicking the link below.