PRECOATED SAND CASTING is a relatively new technology used in the mass production of small, intricate objects. Its name comes from the fact that it uses a fine, dry silica sand with minimal clay content. The sand is coated with a 3 to 8 percent thermosetting resin, such as phenol formaldehyde or silicon grease. This resin is then poured into the sand mold, creating a hard shell six millimeters thick. The resulting mould must be heated to 440-650degF for several minutes to complete the curing process.

The granularity of the coated sand is 80 orders. Its bulk density is 2.6 grams per cubic meter. Its fusing point is 95 to 105 degrees Celsius. It has a high melt point, making it ideal for use in thermal-core casing production. The igloss gradation of precoated sand is 3.39%. Its bending strength is 7.95Mpa and has a low tensile strength.

PRECOATED SAND is a key ingredient in the process of shell molding. Its properties are well suited for producing filigree components in casting alloys. Its dimensional accuracy is high, and it has good cold and hot bending strength. Additionally, the company reports that it has good decoring and disintegration properties. As a leading provider of advanced chemicals, ASK Chemicals develops custom solutions for specific casting applications. The novel sand is specifically adapted for foundries.

The advantages of PRECOATED SAND casting over traditional casting methods are numerous. The first is its high granularity. By using precoated sand, you can increase the curing speed by up to 30%. The second is its improved surface quality. Because it is precoated, it improves the hardness of the finished part. The sand is more porous, it can become brittle and break.

Precoated sand can be manufactured for a variety of applications. Its properties include granularity 80 orders, and bulk density 2.5 grams per millimeter. Its melting point can be adjusted to 96100. It can be produced as green state sand, rattail proof sand, or chilling sand. This material must meet the quality and safety requirements of Q/QCJ100-1997.

Precoated sand is an effective alternative to natural sand, and is a relatively advanced casting technology. It can be used on a variety of types of metals, and it meets the primary quality casting standards. The resulting product is often more precise and has better surface quality. It can be utilized in construction for many applications and requires less maintenance. It can be an excellent choice for building foundations and walls.

The precoated sand is preferably coated with a weathering-resistant epoxy resin. Hydrogenated bisphenol A epoxy resin is also suitable for this process. However, the precoated sand is more expensive than natural sand. The method of production involves molding, sand conditioning, and core pattern making. The sand is ideally suited for high-quality concrete and is an excellent choice for building in large quantities.