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Lost foam casting

STMMA is an expandable Co-polymer resin beads developed for foamed patterns of lost foam casting process, it is co-polymerization reacted by liquid methyl methacrylate monomer and styrene monomer. Compared with the EPS, STMMA carbon molecule content has been greatly reduced in order to eliminate carburization defects in the process of lost foam casting. This formula Co-polymer product was designed for high-quality required valves, pipe fittings and machinery parts, especially made of gray iron, ductile iron and low-carbon steel.

Category:

Lost Foam Casting

Keyword:

Lost foam casting


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Details

1. Product Overview
STMMA is an advanced expandable copolymer resin bead engineered for precision lost foam casting.Composed of styrene-methyl methacrylate copolymer (Styrene:MMA=3:7) and n-pentane blowing agent, it significantly reduces carbon defects compared to traditional EPS foam. Designed for high-value castings including valves, pipe fittings, and machinery components in:
· Gray Iron
· Ductile Iron/Nodular Iron
· Low-Carbon Steel

 

2. Key Advantages

 

Feature

STMMA vs EPS

Benefit

Carbon Content

62%vs 93%

Reduces lustrous carbon defects by 60%+, Achieve 90%+casting yield

Gasification Temp

50C lower

Saves $50-$100/ton in energy costs

Residue Type

Liquid vs Tar

Cleaner decomposition,minimal surface contamination

Molecular Weight

220k vs 50-60k

Lower shrinkage for dimensional accuracy

 

3. Technical Specifications

3.1 Chemical & Physical Properties

Property

Method

Value

Unit

Chemical Composition

92%Styrene-co-MMA,8%n-pentane

Bead Size Distribution

Visual

See Section 3.2

mm

Volatile Content

JB/T11846-2014

7-9%

%

Moisture Content

JB/T11846-2014

<0.5%

%

Foaming Temperature

95-105

 

3.2 Product Specifications

Product CodeVolatile ContentCarbon IncreaseBead Size(mm)Pre-Expansion Density

STMMA-2#

≥7.0%

≤0.04%

0.65-0.85

19-21 g/L

STMMA-3#(A)

≥7.0%

≤0.04%

0.50-0.65

20-22 g/L

STMMA-3#

≥7.0%

≤0.04%

0.36-0.50

21-23 g/L

STMMA-3#(S)

≥7.0%

≤0.04%

0.33-0.35

23-26 g/L

STMMA-4#

≥7.0%

≤0.04%

0.25-0.33

23-26 g/L

 

4. Process Guidelines
4.1 Pre-Expansion
· Temperature: 95–105℃
· Pressure: 0.03–0.05 MPa
· Time: 40–60 seconds
· Target Density: Refer to Section 3.2

4.2 Aging
· Minimum Aging Period: 24 hours (ambient temperature-dependent)

5. Safety & Compliance
· Hazard Class: UN2211, Class 9
· Storage:
· Shelf Life: 3–6 months (original sealed packaging)
· Conditions: Cool (<15℃), dry, away from sunlight/alkali/acid
· Handling: Avoid ignition sources; ensure ventilation to prevent hydrocarbon vapor buildup.

 

6. Packaging & Logistics

Package Type

Net Weight

Gross Weight

Special Requirements

Steel Drum

125 kg

144 kg

Plastic liner for pentane retention

 

7. Why Choose STMMA?

· Proven Results: 0.04% max carbon increase post-pouring
· Industry Recognition: "Green Revolution" solution for casting defects
· Cost Efficiency: Energy savings up to $100/ton
· Global Compliance: Meets JB/T11846-2014 standards
· Achieve 90%+casting yield

 

Zhejiang Castchem New Material Co., Ltd, CN. 324002
Castchem markets this product through the following entities:
Castchem Hangzhou factory, Ltd
Castchem Quzhou factory, Ltd
For the contact details of Castchem, please visit www.zj-castchem.com or www.china-castchem.com
Contact Person: Eowyn Jiang
Inquiry: eowyn@zj-castchem.com 
Technology consulting:+86-571-56396961
Tel:+86-17857651655
Before using a product sold by one of the Castchem family of companies, users should make their 
independent determination that the product is suitable for the intended use and can be used safely and 
legally. 
SELLER MAKES ON WARRANTY; EXPRESS OR IMPLIED(INCLUDING AND WARRANTY OF 
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE)OTHER THAN AS SEPARATELY AGREED 
BETWEEN THE PARTIES IN WRITING.
Release Date: Feb 27, 2019
 


 

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