Resin Coated Sand (Shell Sand)
SELKUM™
Shell sand is used in the mold and core making in the “Shell Mold Casting” method. Generally, ŞELKUM™ is produced by silica sand coating with phenolic resin. ŞELKUM™ provides a shell mold of desired thickness during hot molding. The shell molding method has the advantage of low dimensional tolerance and high surface quality parts. For this reason, shell molding are preferred compared to other sand mold casting methods. It is preferred in small and medium-sized casting parts due to its higher efficiency and lower workload requirement.
Product Advantages
- High dimensional tolerance
- High surface quality
- Enables the production of complex and thin-walled molds and cores
- Low sand and resin requirement for molding
- Applied to all small and medium size casting alloys.
| Product Types | Particle Size (AFS) |
Hot Tensile Strength (kgf/cm²) |
Loss on Ignition (900°C, %) |
Gas Content (g/cm³) |
Shelf Life (25 ºC, month) |
|---|---|---|---|---|---|
| SELKUM 010 | 45 - 50 | 5 - 9 | 1.50 - 1.90 | 7 - 10 | 12 |
| SELKUM 115 | 50 - 55 | 7 - 10 | 2.20 - 2.50 | 9 - 11 | 12 |
| SELKUM 215 | 60 - 65 | 7 - 10 | 2.20 - 2.50 | 9 - 11 | 12 |
| SELKUM 225 | 60 - 65 | 11 - 13 | 2.60 - 2.90 | 10 - 12 | 12 |
| SELKUM 230 | 60 - 70 | 13 - 16 | 3.00 - 3.30 | 20 - 24 | 12 |
| SELKUM 235 | 60 - 65 | 16 - 20 | 3.10 - 3.40 | 12 - 14 | 12 |
| SELKUM 240 | 60 - 65 | 20 - 25 | 4.00 – 4.30 | 14 - 20 | 12 |
| SELKUM 245 | 60 - 65 | 25 - 30 | 4.40 - 4.90 | 22 - 27 | 12 |
| SELKUM 250 | 60 - 65 | 25 - 30 | 4.30 - 4.70 | 21 - 25 | 12 |
| SELKUM 260 | 60 - 65 | 30 - 35 | 5.00 - 6.00 | 25 - 30 | 12 |
| SELKUM 335 | 80 - 90 | 9 - 14 | 3.10 - 3.40 | 12 - 14 | 12 |
| SELKUM 350 | 80 - 90 | 18 - 23 | 4.30 - 4.70 | 16 - 20 | 12 |
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(*) Standard product test data are referenced.
