Mastars

Location: Home » Resources » FAQ
Related news
How to make full use of CNC punch die|Prototype manufacturer Mastars
How to make full use of CNC punch die|Prototype manufacturer Mastars
In the sheet metal industry, how to make full use of CNC punch molds correctly, so as to improve the production efficien...
Mastars introduces you to Multi Jet Fusion technology|rapid prototyping services
Mastars introduces you to Multi Jet Fusion technology|rapid prototyping services
MJF technology claims to have much faster printing speed and much higher material utilization than other additive manufa...
Advantages and disadvantages of plastic extrusion molding
Advantages and disadvantages of plastic extrusion molding
Mastars employ proven prototype technologies(CNC machining, Vacuum casting, 3D printing etc.), to take new concept or de...
Glass fiber reinforced as plastic and its injection molding process|Mastars
Glass fiber reinforced as plastic and its injection molding process|Mastars
Talk about glass fiber reinforced as plastics and injection molding process? Mastars is a large plastic mold manufact...
Mastars: Aluminum vs Steel Tooling Injection Molding
Mastars: Aluminum vs Steel Tooling Injection Molding
How to build a proper tool is critical for a new project. We always looking for the right material to produce the right ...
Understand forging process|Mastars|forging manufacturer
Understand forging process|Mastars|forging manufacturer
Mastars is a professional forging manufacturer with modern forging production line and stainless steel forging processin...
Surface treatment process(1)|rapid cnc machining|Mastars
Surface treatment process(1)|rapid cnc machining|Mastars
The purpose of surface treatment is to meet the requirements of corrosion resistance, wear resistance, decoration or oth...
Importance of deburring hardware parts|rapid cnc machining|sheet metal prototype
Importance of deburring hardware parts|rapid cnc machining|sheet metal prototype
in recent years, various industries pay more and more attention to burr removal. In this issue, mastars tells you in det...
Hardness of metallic materials-rapid cnc machining
Hardness of metallic materials-rapid cnc machining
Mastars provides molding solutions for all over the world, the company has a wealth of technical and manufacturing exper...

Contact us

  • Building 6 , Blue Sky Industrial Park, Ditang Road, Shajing Town, Shenzhen City,Guangdong, China (518104)
  • marketing@mastars.com

Properties and characteristics of PMMA materials|injection mold design services

Release date:01 , Jan , 0001 Source:Mastars Pageviews:-
PMMA material is commonly known as plexiglass, acrylic, etc., and its chemical name is polymethylmethacrylate. It is a kind of non-toxic and environmental friendly material. It is often used as acrylic plate, acrylic plastic particles, acrylic light box, signboard, acrylic bathtub, etc.

PMMA material is commonly known as plexiglass, acrylic, etc., and its chemical name is polymethylmethacrylate. It is a kind of non-toxic and environmental friendly material. It is often used as acrylic plate, acrylic plastic particles, acrylic light box, signboard, acrylic bathtub, etc. the automotive field is mainly automotive tail lights, signal lights, instrument panels, etc., the pharmaceutical industry (blood storage containers), industrial applications (DVDs, light diffusers), Buttons of electronic products (especially transparent), daily consumer goods (beverage cups, stationery, etc.).

PMMA

Process characteristics of PMMA:

PMMA is an amorphous polymer with Tg of 105 ℃, melting temperature of more than 160 ℃, and decomposition temperature of more than 270 ℃. Therefore, the molding temperature range is wide.


PMMA in molten state shows high melt viscosity and poor fluidity, and melt viscosity is sensitive to temperature changes. The influence of the change of injection temperature on the melt flow length is more significant than that of injection pressure, and more significant than that of injection rate and mold temperature. Therefore, changing the fluidity of PMMA molding mainly starts from the injection temperature.


PMMA has certain hydrophilicity. The water absorption of its particles is up to 0.3% - 0.4%. The existence of water makes bubbles appear in the melt. The resulting products have silver wires, and the transparency is also reduced. Therefore, it is required to dry the resin before injection molding.


Because high transparency is the characteristic of PMMA, the existence of any impurity will expose the light refraction relationship on the products, so it is required to do a good job in cleaning the environment before processing and molding.


PMMA is hard, brittle and easy to crack. Therefore, the molding, shrinkage and demoulding slope of products should be selected. Common plunger injection molding machines and screw injection molding machines can be processed as long as the product consumption does not exceed 70% - 80% of the maximum injection volume. Open nozzle with heating and temperature control device shall be selected.