Medical Injection Molding

Medical Injection Molding

Asia Billion is a custom medical injection molding company in China. we make more than 40 sets medical injection mold tooling each year as well as some medical plastic molding in our molding plant too. This part is main body for medical vaporizer. it used for some respiratory disease treatment.

Product Details

Asia Billion is a custom medical injection molding company in China.  we make more than 40 sets medical injection mould tooling each year as well as some medical plastic molding in our molding plant too.   This part is  main body for medical vaporizer. it used for some respiratory disease treatment. because this part need to be molded in clean room , so we transfer the mold to our customer molding plant for mass production.  but before the mass production , Asia Billion already run thousands part for initial new project development testing. 


Production details:  


Medical injection molding

Core surface finish:

MATT finishing

Production Material:

Medical grade PP

Cavity surface finish:

MATT finishing

No of Cavities:

1x 4

Injection System

Cold Runner

Core Material:

S136 with heat treated and  nitridation

Type of gating:

Sub gate

Cavity Material:

S136 with heat treated and nitridation

Cycle time:

40 s

Slider material:

S136 with heat treated and nitridation

Lead time for T1

45 days


Clean water

Mold life:

1 000 000

Place of Origin



Vacuum bags

Product Characters:

1. medical plastic injection molding with huge volume mass production up to 10 million parts per year ( several molds , not only one )

2. 4 side sliders of the part , it is very difficult for the mold

3. Complex part design and mold design

4. Click inside the tube and outside connector

5. No visible parting line for the outside surface

6. Stainless mold base steel 

Characteristics of PP plastic for medical injection molding process parameters

Medical PP plastic features:

    PP plastic is colorless, odorless and non-toxic. It looks like polyethylene but is more transparent and lighter than polyethylene. PP is a kind of thermoplastic with excellent performance, which has the advantages of small specific gravity (0.9g/cm3), non-toxicity, easy processing, impact resistance and flex resistance.

    Main properties of medical grade PP plastics:

    1) High temperature disinfection:

    PP plastic raw material is a semi-crystalline material with high melting point, good heat resistance and can be sterilized at temperatures above 100 °C. Yield strength, tensile strength, compressive strength, hardness and elasticity are higher than polyethylene (PE).

   2) Low temperature resistance and impact resistance:

    The homopolymer PP has a high brittleness, and the random copolymer PP synthesized with ethylene has better toughness and stronger impact strength. Generally, products used under low temperature conditions should be modified with PP or by adding thermoplastic rubber to increase the flexibility and low temperature impact resistance.

Processing conditions

   1) Processing technology:

    It can be injection molded, extruded, blow molded or made into a film. The PP film is usually welded into a bag by heat sealing, and the processing process is more complicated than the process of welding the PVC bag with high frequency. Non-PVC large infusion bags are produced using fully automated equipment to ensure process stability and reliable quality.

    2) Drying treatment:   Low water absorption, no need for drying treatment.

    3)  Melting temperature: 220-270 ° C, be careful not to exceed 275 ° C. Mold temperature: 40-80 ° C, 50 ° C is recommended.

   4) Injection pressure: Can be as large as 1800bar.

    5) Injection speed:   High-speed injection molding can reduce the internal pressure to * small. If defects appear on the surface of the product, low speed injection at higher temperatures should be used.

    6) Runners and gates:

    For cold runners, typical runner diameters range from 4-7 mm. It is recommended to use a round inlet and flow path. All types of gates can be used. Typical gate diameters range from 1 to 1.5 mm, but gates as small as 0.7 mm can also be used. For edge gates,  small gate depth should be half the wall thickness;  small gate width should be at least twice the wall thickness. The hot runner system is fully available for PP materials to save the cost and have stable quality. 

   If you need to find a good partner for your medical injection molding & tooling project, please contact us Asia Billion Freely for any  RFQ or question.

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