Materials
A 3D printing material is suitable for creating injection Mold parts if it has:

High temperature resistance - A high heat deflection temperature is required to withstand the mechanical and thermal loads applied to the mold during material injection. Note though that the temperature decreases rapidly during solidification.
High stiffness/toughness - Repetitively removing parts can cause wear to the mold, so materials with high stiffness are required to maintain mold accuracy over time.
High level of detail - One of the main requirements of an injection mold is high dimensional accuracy and a smooth surface. Highly accurate molds will produce highly accurate parts.
The 3D printing technologies that cover best these requirements are SLA and Material Jetting. These technologies can produce parts with high dimensional accuracy and are ideal for prints intricate details and very fine features. Speciality materials that are available in these technologies, like Formlabs High Temperature resin or Stratasys Digital ABS, are ideal for molding and tooling applications. An outline of the properties that are most relevant to injection molding for these two materials is shown below.

For industrial applications, desktop SLA is not suitable. An in-depth article comparing the two most commonly used industrial 3D printing materials for mold manufacturing (Digtal ABS and Somos PerFORM) can be found here.

We are one of the Guide bush supplier and welcome to your come and purchase!