injection chair moldings

When we choose a mould company for making a high standard chair mould,we need ask the following points,it is very important,for example:1,mould running time,

2,mould run shots guatantee,

3,the parting line finishing is good or not,if there is any sharp edges?

4,the wall thickness is even or not,

5,how they can make the chair mould with less weight but strong enough?

6,how about the stackable?

7,how to make the air venting on the backrest,

8,how to keep your chair finishing long lasting.