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> STMMA

STMMA

Product description: STMMA
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STMMA

We specially produce STMMA copolymer resin series mold materials for foam lost casting, including STMMA, 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.

ompared 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:
1.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

2.STMMA-FC

Item	Index
Appearance	Opaque semi-transparent spherical granule
Range of particle size,μm	200 ~ 800
Content of volatile %	≥ 6.0
Content of moisture %	≤ 0.6
Main applications	Suitable for casting of aluminum, copper alloy, grey iron, common nodular iron piece and steel.

3.STMMA-FD

Item	Index
Appearance	White semi-transparent spherical granule
Range of particle size, μm	200 ~ 800
Content of volatile %	≥ 5.5
Content of moisture %	≤0.6
Main applications	Suitable for casting of aluminum alloy and grey iron pieces

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