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Plastic mold grade classification

Table of Contents

There are different types of plastic mold grades, each with its advantages and disadvantages. Some grades are better suited for specific applications than others.

The American Society of Plastics Industry (SPI AN-102-78), classifies molds into five major categories. Each of these five types of molds has its different requirement criteria, and this mold classification is only applicable to molds with injection molding machines of 400 tons or less.

In this blog post, we will look at the different grades of plastic injection molding and what each grade is used for. We’ll also discuss how to choose the right grade for your project. So, let’s get started!

Injection Mold 101

Cycle time up to 1,000,000 times, used for products with very high production volume. It is made of the best injection mold material and is therefore extremely expensive. Requirements criteria are as follows:

(1) Detailed mold design information is required.

(2) Mould hardness requirement is at least BHN280 (HRC 30).

(3) The mold surface (including upper and lower mold) must be at least BHN450 (48RC ) hardness range. All other accessories such as sliders, inclined tops, press tops, etc. should be made of hardened tool steel.

(4) The ejector must-have guide parts.

(5) Side slider must be equipped with an attrition plate.

(6) Temperature controller should be installed on the upper die, lower die, slider, or possible places on the die.

(7) In mold life, due to the erosion of the cooling water piping, the quality of the product will be reduced and the injection cycle will be increased.

(8) All molds of this type should be equipped with a parting line clamping mechanism.

Injection Mold 102

Cycle time can be 500,000 to 1,000,000 times. It is used for high production volume products and is made of better quality mold material, which is expensive. Requirements criteria are as follows:

(1) Detailed mold design information is required.

(2) The hardness of the mold embryo should be at least BHN280 ( HRC30 ).

(3) The surface hardness of the upper and lower die should be in the range of BHN540 ( HRC 48 ). All other functional parts should be heat treated.

(4) Temperature control should be installed on the upper die, lower die, slider, or mold where possible.

(5) All molds of this type should be equipped with a parting line clamping mechanism.

(6) The following items may or may not be required, depending on the final production quantities considered. It is recommended to make a confirmed quotation for these items as well.

  • Ejector guides
  • Sliders wear plates
  • Erosion-proofed controller pipes
  • Electroplated top die

Injection Mold 103

Cycle time up to 500,000 times. For medium production volume products at reasonable prices. Requirements criteria are as follows:

(1) Detailed mold design information is required.

(2) Mold hardness must be at least BHN165 (HRC17).

(3) The upper and lower dies must be at least BHN280 (HRC30) hardness or above.

(4) All other accessories are optional.

Injection Mold 104

Cycle time up to 100,000 cycles. It is used for low production volume products with the low wear resistance of mold material, and the price is lower than generallyeral reasonable level. Requirements criteria are as follows:

(1) Mold design information is recommended.

(2)embryos embryo can be soft steel or aluminum metal.

(3) The upper die can be aluminum, soft steel, or other identifiable materials.

(4) All other accessories are free to choose from.

Injection Mold 105

Cycle time not exceeding 500 cycles. Used to produce a limited number of first plates at a very low price.  Requirement criteria are as follows. Mold construction may be die-cast material, epoxy resin, or other material that provides sufficient strength to produce a minimum number of first plates.

Conclusion

When selecting a plastic mold grade, the end use of the part must be considered. The four most common grades are general purpose, engineering, medical, and ultra-high purity. There are also specialized grades for specific applications. By understanding the different types of plastics and their properties, you can select the grade that best suits your needs.

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Ask For A Quick Quote

Send drawings and detailed requirements via 

Emial:inquiry@zetarmold.com

Or Fill Out The Contact Form Below: