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We have more than 10 years experience make chair moulds. so pleaseas check this points as below
*Guarantee The mould run short:
The mouldsteel hardness should be HRC33 and should without any welding line.
Need make the parting line finishing good and without any shap edges , otherwise, it's dangerous. 
The step:     Sure the parting line design is correct or not.
                    The cavity and core thinkness is enough or not.
                    Need 3 stages finishing by CNC machine, rough milling, precise milling, final precise milling
*Make the good air venting on the chair mould backrest
Analyze mould-flow and the design will be complex.
*keep your chair mould finishing long lasting
In order to make your chair mould cavity and core will not be rust by the plastic material, you need to be sure that the steel are high chrome and also the hardness are bigger then HRC33. if you will use some recycled material for injection, you need your chair mould be hard chrome plated. Otherwise, you need to make the polishing from time to time.

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