| Type: | expandable polymeric beads Sheet Sandwich Panels STMMA Slab board for |
|---|---|
| Panel Material: | Nonmetal |
| Brand Name: | YK |
| Size: | 6*1.2m |
| Thickness: | 0.8m |
| Model Number: | YK011 |
| Place of Origin: | China (Mainland) |
Quick Details
Specifications
Factory sales expandable polymeric beads Sheet Sandwich Panels STMMA Slab board for Lost form casting
Professional Manufacturer
Surface Profile |
|
rib |
|
wave | |
|
Smooth | |
Insulation Options |
|
Rock wool |
|
Glass wool | |
|
STMMA | |
|
EPS+MMA | |
Steel Thickness |
|
0.3-0.8mm |
Zinc Galvanized |
|
≥120kg/m3 |
Steel Coating |
|
1.PE 2.PVDF(Any RAL Standard Colour |
Insulation Thickness |
|
40-200mm |
Size |
Length |
2.4m-11.5m |
Width |
Standard:950/1000mm(800-1050mm) | |
Applicable Temperature |
|
-150-200℃ |
the Advantage of using the STMMA instead of EPS
Pure EPS: 100% polystyrene, pentane<5.5%
STMMA:30%polystyrene+70%MMA,pentane>7%
STMMA-FD:90%polystyrene+10%MMA, pentane>7%
Decomposition and gasification chemical formula when pouring metal melt:
EPS: C8H8=8C+4H2
STMMA:C5O4H8=3C+2CO2+4H2
from the formula, you will see why residues are more in EPS. and whatever additive you added to EPS, it won't change the main formula.
1.STMMA carbon content of 62%, while carbon in EPS is up to 93%. STMMA will greatly reduce the carburization defects during casting.
2.STMMA has a low pouring temperature, gasification temp generally has 50℃ lower than EPS( STMMA between 1400℃ to 1450℃, EPS between 1460℃ to 1500℃). this will help the foundry to save energy consumption in $50 to $100 per ton of castings.
the molecular bonds are broken orderly when STMMA gasifying, accompany with liquid low molec
3.Ular residues. EPS molecules are disorderly broken, accompany with tar similar residues.
4.the high molecular weight of STMMA will reduce the pattern's dimensional shrinkage rate. Compare with the 220 thousands of molecular weight, EPS has only 50 to 60 thousands of molecular weight.
(the lost foam casting foam-pattern making raw material)
SPECIFICATIONS of STMMA for LOST FOAM CASTING Chemical Hazard Class 9/ UN2211 American Patent:US 6770 681 B2 | |||||||
Product |
Volatile level |
Moisture |
Beads size |
Density* |
Suitable for castings with a min thickness of* |
Additives* |
Typical Applications* |
Name |
(by wt.) |
Distribution peak | |||||
STMMA-1# |
≥ 7.0% |
≦0.6% |
600-900 m |
18-20g/L |
6~9mm |
Yes |
Aluminum,copper alloy,grey iron,nodular iron,alloy steel,mild steel and stainless steel |
STMMA-2# |
≥ 7.0% |
≦0.6% |
450-600 m |
19-21g/L |
4.5~6mm |
Yes | |
STMMA-3A# |
≥ 7.0% |
≦0.6% |
400-550 m |
20-22g/L |
4.5~6mm |
Yes | |
STMMA-3# |
≥ 7.0% |
≦0.6% |
350-500 m |
21-23g/L |
3.5~5mm |
Yes | |
STMMA-4# |
≥ 7.0% |
≦0.6% |
250-350 m |
23-26g/L |
2.5~3.5mm |
Yes | |
STMMA-FD special |
≥ 7.0% |
≦0.6% |
900-1250 m |
17-19g/L |
9~12.5mm |
Yes |
Aluminum alloy,grey iron |
STMMA-FD1# |
≥ 7.0% |
≦0.6% |
600-900 m |
18-20g/L |
6~9mm |
Yes | |
STMMA-FD2# |
≥ 7.0% |
≦0.6% |
450-600 m |
19-21g/L |
4.5~6mm |
Yes | |
STMMA-FD3# |
≥ 7.0% |
≦0.6% |
350-450 m |
21-23g/L |
3.5~5mm |
Yes | |
STMMA-FD4# |
≥ 7.0% |
≦0.6% |
250-350 m |
23-26g/L |
2.5~3.5mm |
Yes | |
* Density is a function of utilities and expander capabilities; the above values represent optimum expansion conditions. | |||||||
*the select of beads size shall be according to the min thickness of the casting wall, used to be 1/10 of it. for example, you could choose the 700 m szie beads if the casting's thinnest wall is 7mm. If the casting needs a high precision, it can also choose the next small class. | |||||||
*Contains an additive which quickly reduces the molecular weight of polystyrene at elevated temperatures. Formula Solutions: 1.) STMMA series are focused on carbon rising defect in castings and with less residues,Low dissolution temperature 2.) the STMMA-FD series have great advantages in solving fold defect by aluminum casting and applications in iron castings having excessive lustrous carbon, porosity defect solved. | |||||||
*Typical Application means we have tested in this kind of metal, metals beyond that are according to be actually used. | |||||||