Mold Classifications
Mold Classifications
Classifications of Injection Molding Tools
SPI Class 101 Mold
*CYCLES: One million or more
DESCRIPTION: Built for extremely high production. This is the highest priced mold and is made with only the highest quality materials.
- Detailed mold design required.
- Mold base to be a minimum hardness of 280 BHN.
- Molding surfaces (cavities and cores) must be hardened to a minimum 50 R/C range. All other details, such as slides, heel blocks, gibs, wedge blocks, etc. should also be of hardened tool steels.
- Ejection should be guided.
- Slides must have wear plates.
- Temperature control provisions to be in cavities, cores, and slides whenever possible.
- Electroless nickel plating of all water channels is recommended. This greatly inhibits the chance of rust and makes it easy to clear sediment from plugged lines.
- Parting line locks are required on all models.

SPI Class 102 Mold
*CYCLES: Under 500,000
DESCRIPTION: Medium to high production mold, good for abrasive materials and/or parts requiring close tolerances. This is a high quality, fairly high priced mold.
- Detailed mold design recommended.
- Mold base to be a minimum hardness of 280 BHN.
- Molding surfaces should be hardened to at least 48 R/C. All other functional details should be made and heat treated likewise.
- Temperature control provisions to be directly in the cavities, cores, and slide cores wherever possible.
- Parting line locks are recommended for all molds.
- The following items may or may not be required depending on the ultimate production quantities anticipated. It is recommended that those items desired be checked and made a firm requirement for quoting purposes:
- Guided Ejection
- Slide Wear Plates
- Plated Temperature Control Channel
- Plated Cavities

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SPI Class 103 Mold
*CYCLES: Under 250,000
DESCRIPTION: Medium production mold. This is a very popular mold for low to medium production needs. Most common price range.
- Detailed mold design recommended.
- Mold base to be a minimum hardness of 165 BHN.
- Cavity and cores must be 280 BHN or higher.
- All other extras are optional.

SPI Class 104 Mold
*CYCLES: Under 10,000
DESCRIPTION: Low production mold. Used for limited production preferably with nonabrasive materials. Low to moderate price range.
- Mold design recommended.
- Mold base can be of mold steel or aluminum.
- Cavities can be of aluminum, mild steel or any other agreed upon metal.
- All other extras are optional.
SMI will be responsible for normal maintenance.
Maintenance on tools running beyond their life cycle will be the responsibility of the customer.
*CYCLES ARE APPROXIMATE AND FOR COMPARISON PURPOSES ONLY

SMI will be responsible for normal maintenance.
Maintenance on tools running beyond their life cycle will be the responsibility of the customer.
*CYCLES ARE APPROXIMATE AND FOR COMPARISON PURPOSES ONLY
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Address
Rosti PCI - Clearfield, UT
(SMI Molding, Inc.)
Freeport Center, Bldg. Z-13
Clearfield, UT 84016
Phone
(801) 776-4233
Fax
(801) 825-0982
sales@smimolding.com