We already bought the resins needed for part production. And our agenda, the parts' molds. We will start manufacturing molds with a company. We want to have a little knowledge, associated with mold resins. Product' resin's TG around 120 degrees: 119 

In the model and mold production, economic resins with high-temperature resistance present in the market?

Instead of choosing as high-quality resin as the resins we buy for product production, we only want to choose resins that have heat resistance and price advantage for molds/models.

It will be quite expensive to produce molds with resins that have high mechanical strength.

We have already bought the products for part production. And our agenda, the parts' molds. We will start manufacturing molds with a company. We want to have a little knowledge, associated with mold resins. In the model and mold production, economic resins with high-temperature resistance present in the market? Instead of choosing as high-quality resin as the products, we only want to choose products that have heat resistance and price advantage for molds/models. It will be quite expensive to produce molds with resins that have high mechanical strength.
What do you recommend to us?