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We specially produce STMMA copolymer resin series mold materials for foam lost casting, STMMA foamable copolymer resin beads, and they are mainly used to produce castings for valves, pipings, car fittings and various machinery fittings.
Compared with EPS, STMMA series foamable copolymer resin beads have much excellent casting performances
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Products
We specially produce STMMA copolymer resin series mold materials for foam lost casting, including STMMA, STMMA-FD and STMMA-FC foamable copolymer resin beads, and they are mainly used to produce castings for valves, pipings, car fittings and various machinery fittings.
Compared with EPS, STMMA series foamable copolymer resin beads have much excellent casting performances:
Reducing carbon defect of castings;
Reducing carburization defect on surface of steel castings;
Reducing smoke carbon;
Improving surface finish of castings |
Main specifications of technical performances of product:
STMMA
Item |
Index |
Appearance |
Opaque spherical granule |
Range of particle size, μm |
200 ~ 800 |
Content of volatile % |
≥7.0 |
Content of moisture % |
≤ 0.6 |
Main applications |
Suitable for casting of aluminum, copper alloy, grey iron, nodular iron, alloy steel, mild steel and stainless steel. |
Name |
unit |
EPS |
STMMA |
Molecule |
|
-(C8H8)n-(C8H8O2)m- |
-(C8H8O2)-m |
Carbon |
% |
92 |
60 |
Crumble |
j/g.k |
-912 |
-842 |
Tg |
℃ |
80-100 |
100-105 |
Evaporation(start) |
℃ |
270-300 |
250-260 |
Evaporation(end) |
℃ |
460-500 |
420-430 |
Pattern making of STMMA copolymer resin series
For the lost foam casting process, making of foamed plastic patterns is a very important link. No matter what resin granules are used, the patterns-making process is basically same and is shown as follows:
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