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How to distinguish the grade of injection mold?

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How to distinguish the grade of injection mold?
Click number:- Release time:2019-06-05
How to distinguish the grade of injection mold? Take a look at the five major standards of American molds

The American Plastics Industry Association (SPIAN-102-78) divides molds into five standard categories. These five types of injection molds each have different requirements. This classify is only suitable for molds with injection molding machines weigh 400 tons or less.

How to distinguish the grade of injection mold?


Class 101

Cycle time can reach 1 million shots, it is used in products with extremely high output. Normally choose the best mold steel, so the price is extremely expensive. The requirements are as follows: 

(1)Detailed mold design information is required.

(2)Hardness has to reach at least BHN280 (HRC 30)

(3)The mold surface (including the cavity and core ) must be at least in the BHN450 (48RC) hardness range. Hard tool steel should be used for all other accessories such as sliders, lifters. 

(4)Must have the ejector guides

(5)The side slider must be equipped with a loss plate

(6)Cavity side, core side, sliders, or somewhere else may need the temperature controller  

(7)For the mold life, the quality of the product will be reduced due to the erosion of the cooling water pipeline and the injection molding cycle increased. It is recommended to have an embedded member or template for cooling the water to be treated for erosion prevention.

(8)All molds of this type are equipped with a parting line clamping system.


How to distinguish the grade of injection mold? 01


Class 102

The cycle time can reach 500,000 shots to 1 million shots. For high-volume production, it is made of better quality mold steel and is expensive. The requirements are as follows:

Detailed mold design information is required.

Hardness requirements must be at least BHN280 (HRC30)

The surface hardness of the cavity and core sides shall be in the range of BHN540 (HRC 48). All other functional accessories should be heat treated.

Cavity side, core side, sliders, or somewhere else may need the temperature controller  

All molds of this type are equipped with a parting line clamping system.

The following project possibilities are required or not, depending on the final production quantity considerations. It is recommended that these projects also make a confirmed quotation.

Ejector guide

Slider Consumable Plate

Controller pipe that has been treated for erosion protection

Plating on mold 

Class 103 

The cycle can reach 500,000 times. For medium production quantities, the price is reasonable. The required standards are as follows

Detailed mold design information is required.

Hardness requirements must be at least BHN165 (HRC17)

The cavity and core must have a minimum hardness of BHN280 (HRC30) or more.

Free choice of all other accessories

Class 104 

The cycle can reach 100,000 times. For low-volume products, the mold material wear resistance is not high, and the price is lower than the general level. The requirements are as follows:

Suggest to offer mold design information

The mold base can be gentle steel or aluminum 

The mold base can be aluminum, gentle steel or other identifiable material

All other accessories are free to choose


How to distinguish the grade of injection mold? 02


Class 105 

The cycle does not exceed 500 times. Used to produce a limited number of prototypes, the price is very cheap. The requirements are as follows:

The mold structure may be die-cast material, epoxy or other material that provides sufficient strength to produce the lowest number of first samples.

【Paper label】:injection mold
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