STMMA Block

STMMA-FD is a styrene-methyl methacrylate copolymer resin bead developed by Castchem, specifically engineered to address gas porosity and fold defects in lost foam casting processes. Through the incorporation of methyl methacrylate (MMA) copolymer and organic bromide additives, this product significantly improves casting yield rates, suitable for aluminum alloy and gray iron casting production.

Category：

STMMA Blocks

Keyword：

STMMA Block

0086-571-86370688

info@zj-castchem.com

Wu Jiong：008615068719527

Inquiry

Details

I. Product Overview
STMMA-FD is a styrene-methyl methacrylate copolymer resin bead developed by Castchem, specifically engineered to address gas porosity and fold defects in lost foam casting processes. Through the incorporation of methyl methacrylate (MMA) copolymer and organic bromide additives, this product significantly improves casting yield rates, suitable for aluminum alloy and gray iron casting production.

II. Core Advantages
1. Defect Control
· 90% reduction in carbon residue (vs. pure EPS)
· Rapid gasification characteristics (900°C decomposition temperature)
· Effectively resolves gas porosity, carbon defects, and fold issues
2. Process Optimization
· Uniform foaming performance
· Gas release capacity: 700ml/g (900°C)
· Suitable for complex thin-wall castings (minimum thickness: 2.5mm+)
3. Material Properties
· Chemical composition: 92% styrene-methyl methacrylate copolymer (9:1 ratio) + 8% n-pentane
· Additives: Contains organic bromides to accelerate high-temperature molecular chain scission
· Appearance: Semi-transparent pearl-like granules

III. Technical Specifications
Basic Properties

Test Item	Standard Method	Typical Value	Unit
Volatile Content	JB/T11846-2014	>5.5%	%
Moisture Content	JB/T11846-2014	<0.5	%
Decomposition Temp	JB/T11846-2014	900	℃
Test Item	Standard Method	Typical Value	Unit
Gray Iron Casting Range	JB/T11846-2014	1480~1450	℃

Model Specifications Comparison

Model	Pre-expansion Ratio	Peak Particle Size(mm)	Recommended Density(g
STMMA-FD Special	68-85	0.90-1.25	17-19
FD1#B	65-83	0.71-0.90	18-20
FD1#S	65-83	0.60-0.71	18-20
FD2#	64-80	0.45-0.60	19-21
FD3#	63-80	0.35-0.45	21-23
FD4#	63-80	0.25-0.35	23-26

IV. Safety & Handling
Safety Warnings
❗ Fire/static electricity contact prohibited
❗ Mandatory ventilation required in work areas
❗ Transport as UN2211 Class 9 Dangerous Goods

Storage Requirements

· Shelf life: 6 months (original sealed packaging)
· Storage temperature: Refrigerated storage recommended
· Reseal immediately after opening to prevent pentane volatilization

V. Processing Guidelines

Pre-foaming Parameters
· Steam temperature: 80-90°C (atmospheric pressure)
· Foaming duration: 15-30 seconds
Curing Treatment
· Ambient temperature matching: 6-48 hours aging period
Molding Recommendations
· Refer to attached Mold Forming Operation Guide

VI. Packaging Specifications

Packaging Type	Net Weight/Gross Weight	Remarks
Steel Drum	125kg/144kg	Leak-proof plastic liner
Custom Bags	25kg/bag	Available per request

VII. Performance Comparison
Chemical Property Comparison

Parameter	STMMA-FD	Conventional EPS
Carbon Residue	10%reduction	High carbon residue
Decomposition Products	High gas yield	Solid carbon byproducts
Additives	No flame retardants	Contains flame retardants

Note: Complete technical documentation and MSDS available upon request from technical support.

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