Electric motor housings require robust structure, reliable heat dissipation and stable dimensional consistency. Lost foam casting (EPC, evaporative pattern casting) is an ideal manufacturing solution for these complex castings.

This process uses a foam replica matching your motor housing design. After refractory coating, the foam cluster is buried in binder-free dry sand. When molten iron is poured, the foam vaporises instantly, and metal fills the cavity to form an integrated housing with cooling fins, mounting bosses and internal passages in one piece.

✅ No parting lines, no separate sand cores; fewer assembly joints and lower leakage risk

✅ Near-net-shape result, less CNC machining and material waste

✅ Great freedom for integrated cooling fin designs to optimise heat dissipation

✅ Recyclable dry sand, cleaner workflow and competitive unit cost for medium and large batches

✅ Stable repeatability for grey iron and ductile iron motor housings

Surface finish cannot match investment casting. Strict control on coating, pouring and ventilation is required to avoid porosity and carbon defects. It suits industrial, pump, fan and heavy-duty motor housings better than ultra-precision small motor parts.

We mainly produce grey iron (HT200 / HT250) and ductile iron motor housings. One-stop support includes CNC machining, tapping, heat treatment, painting and surface finishing.

ASTM A48 Class 35 gray cast iron, HT250, EN-GJL-250, GG25, FC250, FGL250, G25, T250, O125 or ISO Grade 250

The composition of gray cast iron is 2.5%-4% carbon, 1%-3% silicon, and some additions of manganese ranging from 0.1% to 1.2%.

We operate an independent lost foam casting workshop, backed by over 25 years of casting experience and 100,000 kg monthly output. We accept custom orders based on your drawings or samples, with rigorous QC and reliable lead times.

Send us your motor housing specification for a free quotation.