SPECIFICATIONS OF STMMA FOR LOST FOAM CASTING

Chemical Dangerous Grade 9/ UN2211

American Patent:US 6770 681 B2

Product

Volatile level

Moisture

Beads size

Density Suggestion*

Suitable for castings with a min thickness of*

Additives*

Typical Applications*

Name

(by wt.)

distribution peak

STMMA-1#

≥ 7.0%

≦0.6%

600-900 µm

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 µm

19-21g/L

4.5~6mm

Yes

STMMA-3A#

≥ 7.0%

≦0.6%

400-550 µm

20-22g/L

4.5~6mm

Yes

STMMA-3#

≥ 7.0%

≦0.6%

350-500 µm

21-23g/L

3.5~5mm

Yes

STMMA-4#

≥ 7.0%

≦0.6%

250-350 µm

23-26g/L

2.5~3.5mm

Yes

STMMA-FD special

≥ 5.5%

≦0.6%

900-1250 µm

17-19g/L

9~12.5mm

Yes

Aluminum alloy,grey iron

STMMA-FD1#

≥ 5.5%

≦0.6%

600-900 µm

18-20g/L

6~9mm

Yes

STMMA-FD2#

≥ 5.5%

≦0.6%

450-600 µm

19-21g/L

4.5~6mm

Yes

STMMA-FD3#

≥ 5.5%

≦0.6%

350-450 µm

21-23g/L

3.5~5mm

Yes

STMMA-FD4#

≥ 5.5%

≦0.6%

250-350 µm

23-26g/L

2.5~3.5mm

Yes

* Density suggestion 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 µm 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. Recommended for applications in aluminum having fold defects and applications in iron having excessive lustrous carbon in castings.

*Typical Application means we have tested in this kind of metal, metals beyond that are according to be actually used.