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Description

Feldspar group minerals are the general name for a group of aluminosilicates of sodium, potassium, calcium and barium with a framework crystal structure formed by tetrahedra of silicon and aluminum. The group is divided into alkali feldspars (orthoclase, microcline) and plagioclases - from sodium to calcium members of the series. A natural mineral product, the product item combines several mineralogical species of the group under one CAS number.

Basic Attributes

• CAS No: 68476-25-5
• Molecular Weight: 263.231
• Exact weight: 262.869
• EU number: 270-666-7
• DSSTox ID: DTXSID1098836
• PSA Specifications: 119.03
• XLogP3: −1.8291

Physical properties

• Appearance: dry powder
• Mohs hardness: 6–6.5 (general characteristic of the mineral group)
• Luster: from glassy to pearlescent (general characteristic of the mineral group)

Scope of application

Feldspar is a raw material for the production of ceramics, glass, enamels, sanitary products, and a filler in the paint and varnish and polymer industries. Provides fusibility and stability during the formation of a homogeneous structure of ceramic and glass masses at high temperatures due to the content of alkali and alkaline earth oxides. It is also used in the production of abrasives, binders for abrasive wheels, cements, insulating compounds, fertilizers, feed lime for poultry and roofing materials with bitumen coating. The choice of a specific type of feldspar (potassium or sodium) for a particular production is determined by the required melting point and the composition of the final glassy phase of the product.

Safety Information

GHS Classification: Warning, H319 (88.45% of notices) - Causes serious eye irritation. Precautions: P261, P264, P271, P280, P304+P340, P305+P351+P338, P312, P337+P313, P403+P233, P405, P501. Aggregated classification information was provided by 696 companies from 13 notifications to the ECHA C&L registry.

Storage and transportation

Store in a dry, closed place in the original packaging, avoid dust formation during loading and unloading operations. When working with powder, use safety glasses and respiratory protection to prevent irritation of the eyes and mucous membranes.

Synonyms

Feldspar, feldspars, aventurine, scalene, lithospar, K-Spar, Minispar 170, Minispar 200, Minispar 4, Minspar 3, Minspar 7, Minspar 200, MK-H, Kiyouseki, G 200, Minex 4F, Minspar 7/10, KM 325, Unispar PG-W 13, Unispar PG-W 20, Youbao X 7.

Role in ceramics and glass production

Chemically, feldspars are an aluminosilicate framework with included cations of potassium, sodium, calcium or barium, which, when fired, release alkali and alkaline earth oxides, which reduce the sintering temperature of the charge and promote the formation of a glassy phase. It is this function that makes the mineral an indispensable technological raw material in the production of porcelain, earthenware, sanitary ceramics, container and sheet glass.