Foundry Ceramsite Sand , AFS Resin Coated Silica Sand SGS Certified
1. Ceramic Foundry Sand Introduction
Our high quality Ceramisite sands are made by fusing, spraying, sieving and purifying high Alumina Calcined Bauxite. They can be used in casting all sizes of steel parts. The spherical shape produces high density material with excellent flow characteristics. The main chemical composition is Al2O3 which provides an excellent refractoriness and stability.
Size: NFS25-35; NFS25-30; NFS30-35; NFS35-40; NFS40-45; NFS45-50; NFS40-50; NFS50-55; NFS55-60; NFS60-65.
2. Ceramic Foundry Sand Specifications
Thermal expansion :
| Sand Type | Linear thermal expansion | ||
| 20 – 300ºC | 20 – 600ºC | 20 – 800ºC | |
| Silica | 14.0 | 23.0 | 17.0 |
| Chromite | 7.1 | 7.5 | 7.5 |
| Zircon | 3.4 | 4.1 | 4.5 |
| Cerabeads | 3.5 | 4.0 | 4.3 |
| Ceramsite | 7.1 | 7.3 | 7.2 |
Compositions:
| Al2O3 | 78-86% |
| SiO2 | 8-13% |
| Fe2O3 | 3.5% (max) |
| TiO2 | 3.5% (max) |
| Refractoriness | 1850C (3362F) |
| Angle Coefficient | 1.1 (max) |
| Thermal Expansion (at 100°C) | 0.15 |
| Thermal Conductivity | 0.196 W/m.K |
| Specific Heat | 873 J/kg |
| Bulk Density | 1.9-2.2 g/cm3 |
| pH Value | 7.65 |
| Shape | Solid Sphere |
| Binder Content Required | 3-4% |
| Crushability | 113 |
3. Ceramic Foundry Sand General advantages
- The thermal expansion coefficient of ceramic sand is very low, which is similar to zircon sand. Using the Ceramic Foundry Sand to make moulds and cores, the veins and other expansion defects of castings are eliminated;
- Because of the great spherical shape of the particle, Ceramic Foundry Sand has good flowability and easy to fill in. The moulds and cores are of high permeability and easy to shakeout after casting;
- By using Ceramic Foundry Sand, 30-50% of the binder consumption can be saved with the smooth surface and substantial structure;
- Ceramic Foundry sand is a neutral and inert material, so it can be used in acid and alkali binders systems, also adapt to various alloys;
- Ceramic Foundry Sand has high refractoriness and good stability. It is especially suitable for the production of complexity sand cores and steel castings;
- It has wide particle size, which can be combined and mixed arbitrarily to meet specific needs of customers.
4. Ceramic Foundry Sand Particle Size Distribution
| TYPICAL CHEMICAL ANALYSIS | |
| AL2O3 | 70-75% |
| SiO2 | 8-20% |
| Fe2O3 | ≤3% |
| TiO2 | ≤3.5% |
| CaO | ≤0.45% |
| MgO | ≤0.35% |
| K2O | ≤0.33% |
| Na2O | ≤0.08% |
| TYPICAL PHYSICAL PROPERTIES | |
| Refractoriness | ≥1800 ºC |
| Specific gravity: | 3.4g/cm3 |
| Bulk density(LPD): | 1.95-2.05 g/cm3 |
| Color: | black brown |
| Grit shape: | spherical ball |
| Thermal expansion coefficient | 6x10-6 /ºC(20-1000ºC) |
| Thermal conductivity | 0.698W/M.K(1200ºC) |
| Thermal expansion ratio | 0.12% |
| Angularity | ≤1.1 |
| Available sizes | |
| AFS15-20,AFS 15-25,AFS25-35,AFS25-30,AFS30-35,AFS35-40,AFS40-45,AFS45-50,AFS40-50,AFS50-55,AFS55-60,AFS60-65,AFS60-70,AFS70-80,AFS95-110 Customized sizes are available upon request | |
5. Ceramic Foundry Sand Applications
Some Resin coated sand makers has add part of ceramiste as the raw material to obtain higher refractoriness, low expansion, easy to diffuse, higher strength and also to make special shape.
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