Longchang earthenware factory is mainly distributed in Shiyanqiao Town, with more than 100. This unique natural original earthenware clay, combined with pure hand-made and traditional methods, makes the produced earthenware resistant to acid and alkali, good in gas permeability and not immersed. The earthenware products are widely used, such as kimchi jars, flower pots, water-filling appliances, wine bottles and so on. Longchang Tutao is listed in the municipal intangible cultural heritage protection list of Longchang Tutao, which has been in existence for hundreds of years. Today in the 21st century, Longchang Tutao is unique in its unique charm.

Longchang earthenware is elegant in style, colorful, simple and elegant, beautiful and practical, delicate, acid and alkali resistant, low density, durable, breathable and not leaking. Longchang Tutao is simple and elegant, with exquisite ceramics, pan-green, rich color and glaze. The knocking sound is loud and crisp, and the remaining sound is sweet. It has good air permeability and long-term use without leakage, and has a large supporting force. (1) Sensory characteristics: simple and elegant, fine porcelain, pan-green, rich in color, glazed and radiant, elegant and translucent. With all kinds of art decoration, it presents the characteristics of various kinds of porcelain. (2) Physical and chemical characteristics: the water absorption rate of porcelain is ≤12%. Thermal stability: (refers to the catering utensils) heat exchange from 160 ° C to 20 ° C once without cracking. Lead and cadmium dissolution: lead dissolution is not more than 5.Omg / L, cadmium dissolution is not more than 0.5mg / L.

Technical requirements for quality of Longchang earthenware 1. The main raw material clay is produced in Shiyanqiao Town, Lishi Town, Shanchuan Town, Yujian Town, Longshi Town, Yunding Town and Hujia Town of Longchang County. The chemical composition of the clay is as follows: chemical composition content (%) silica (SiO2) ≥ 72 aluminum oxide (Al2O3) ≥ 15 ferric oxide (Fe2O3) ≥ 4 sodium oxide (Na2O) ≥ 2 calcium oxide (CaO) ≤ 0.2 Magnesium Oxide (MgO) ≤ 0.5 II. Process selection of soil sludge → blanking → glazing → kiln firing → kiln. Third, the process technical requirements 1. Soil selection: Select a fine, water-absorbing clay to remove impurities. 2. 3. Sterile fermentation: fermenting the slime with water to increase viscosity and flexibility. 4. Billet: Hand-drawing, mud-bar construction bonding, 3 times tapping inside and outside to form drying. 5. Glazing: Remove the dried green tires with a brush to remove the floating soil, then adjust the glaze to the specified concentration, and evenly spray a layer of glaze on the green tires and then dry again. 6. Firing: loading kiln, sealing kiln, first preheating with small fire, gradually warming from normal temperature to whitening of kiln wall, and then start to increase the heat, burning at 1300 °C for 18 to 20 hours, the observation mouth can see the green tire in the kiln It can be stopped by the orange-orange-red-ceramic glaze. Seal all the vents of the kiln, and the temperature in the kiln is equivalent to the natural temperature of the outside. The whole process is about 15 days. After the firing, it is Longchang Tutao. 7. Out of the kiln, inspection: (1) appearance inspection. Whether there is deformation, blistering, over burning, under fire. (2) Hammer tapping, whether there is hoarseness or muffled sound. (3) Pressure test with water, with or without leakage. V. Quality characteristics 1. Sensory features: (1) simple and elegant, delicate ceramics, pan-green, rich color, glaze color. (2) The knocking sound is loud and crisp, and the remaining sound is sweet. (3) Good air permeability and long-term use without leakage, and strong supporting force. 2. Safety and other quality technical requirements: Product safety and other quality technical requirements must comply with relevant national regulations.

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Producers within the scope of Longchang soil pottery can submit an application for the use of the “Special Mark for Geographical Indication Products” to the Quality and Technical Supervision Bureau of Longchang County, Sichuan Province. After being examined by the Sichuan Quality and Technical Supervision Bureau and reported to the AQSIQ for approval, the company will announce it. . The legal inspection agency of Longchang Tutao is designated by the Quality and Technical Supervision Bureau of Sichuan Autonomous Region.