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STMMA Expandable Copolymer Resin Beads

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
Product Description:

1. 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.
Hope to be your best partner.
Tel:+86 17857651655
Whats app/ WeChat: +86 17857651655
Email:eowyn@zj-castchem.com
International Sales Department: Eowyn Jiang


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