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STMMA Expandable Copolymer Resin Beads
The 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. Brand: Castchem
Company type: Manufacturer
Minimum Order Quantity: 125 KG
Supply Ability: 200MT/month
Applications: Lost foam casting pattern foaming
Product Grade: JB/T11846-2014
Country of origin: QuZhou/ZheJiang/China
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Tel:+86-570-3888828 3888789
E-mail: info@zj-castchem.com1. Product Characteristics
Chemical components: 92% Poly styrene-co-methyl methacrylate(Styrene: MMA=3:7), 8%n-pentane.
Additives: n-Pentane(blowing agent), Organic Bromide,etc
Status: Co-polymer resin for lost foam casting
Test Method used : JB/T11846-2014
Features: Low-carbon content, low dissolution temperature,less residues.
Appearance: Oyster white Spherical beads
Typical Customer Applications: Gray iron, ductile iron/nodular iron, low-carbon steel.
2. Typical Properties Method Value Unit
Bead size SEE BELOW / mm
Content of volatile JB/T11846-2014 7~9 %
Content of moisture JB/T11846-2014 <0.5 %
Temperature of foaming JB/T11846-2014 95-105 ℃
3. Specifications
|
Product |
Volatile level for pre-expansion |
Carbon increase after pouring |
Beads size distribution peak(mm) |
Pre-expand density recommend |
Remark |
|
STMMA-1# |
≥ 7.0% |
≦0.04% |
0.85-0.90 |
18-20g/L |
Stop production |
|
STMMA-2# |
≥ 7.0% |
≦0.04% |
0.65-0.85 |
19-21g/L |
available |
|
STMMA-3#(A) |
≥ 7.0% |
≦0.04% |
0.50-0.65 |
20-22g/L |
available |
|
STMMA-3# |
≥ 7.0% |
≦0.04% |
0.36-0.50 |
21-23g/L |
available |
|
STMMA-3#(S) |
≥ 7.0% |
≦0.04% |
0.33-0.35 |
23-26g/L |
available |
|
STMMA-4# |
≥ 7.0% |
≦0.04% |
0.25-0.33 |
23-26g/L |
available |
4. Safety
STMMA Co-polymer should not be exposed to ignition sources (including open flame, sparks, or electrostatic charges) during storage, processing, shipment, and application. Adequate ventilation in all processing areas must be provided to prevent hazardous accumulations of hydrocarbon vapors.
5. Package & Shipping
Packed in the steel drum: N.W=125kgs/drum, G.W=144kgs/drum. Plastic liners are used to maintain product shelf life by retaining the blowing agent.
It must be transported according to the condition of UN2211 and chemical hazard Class 9TH.
6. Storage
Shelf-life: 3-6 months in sealed original package.
STMMA should be put in a chilled warehouse to protect the blowing agent escaping from raw beads quickly. If you do not have this condition, it should be stored in a clean, airtight container, put in a cool dry place, and keep away from direct sunlight or close to alkaline substances, acid, moisture, and other impurities.
When you open the package but do not use it up for one time, please make sure to seal the package, which can protect the pentane from volatilization.
7. Pre-expansion
The pre-expansion of STMMA raw beads should be given saturated steam with 95-105℃ temperature under 0.03-0.05 Mpa , the recommended pre-expansion time is 40-60 secs. For expanded bulk density please see to above-mentioned specifications.
8. Intermediate aging
The recommended aging period for the expanded beads should be above 24 hours, depending on the ambient temperature.
If you require any additional materials or information, we will be more than happy to supply it.
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Tel:+86 17857651655
Whats app/ WeChat: +86 17857651655
Email：eowyn@zj-castchem.com
International Sales Department: Eowyn Jiang
