Vacuum Casting

What Is Vacuum Casting?

Vacuum casting is the process of producing multiple identical products by processing a prototype and then creating a silicone mold.

The vacuum casting process has obvious advantages, such as low cost and fast speed.

Advantages Of Vacuum Casting

Vacuum molding has great advantages in the small batch production of plastic shells, with a wide range of material choices, very suitable for engineering testing, concept verification, and demonstration.

Low cost
Fast turnaround
Wide selection of materials
High precision
Excellent surface smoothness
Wide color options

Processing Steps

Step 1

Master Pattern Preparation

Prepare the master pattern via 3D printing (SLA/DLP), CNC machining, or existing physical parts, ensuring surface smoothness (polishing/sandblasting if needed) and ≥1° draft angle for damage-free demolding.

Step 2

Mold Making

Secure the master pattern in a mold frame with reserved pouring vents/air channels, vacuum-mix liquid silicone (e.g. RTV-2) with curing agent (-0.1MPa), pour into the frame for curing (4-8h at RT or 2-4h at 60°C), then split the mold along parting lines to extract the master and create the cavity.

Step 3

Controlled Vacuum Infusion

Prepare polyurethane (PU) or epoxy resin materials by vacuum degassing after mixing, inject into the silicone mold under vacuum to prevent bubbles, seal the gate, then cure at room temperature or with heating (typically 1-4 hours depending on material).

Step 4

Demolding & Post-Processing

Carefully separate the silicone mold to extract replicas, trim parting-line flashes/gates, then apply surface treatments (painting/plating/polishing) as specified.

Material	Plastic:
	• ABS – (White / Beige / Black / Clear / Customize color)
	• PC / Polycarbonate -(Clear / Translucent / White / Black / Customize color)
	• ABS+PC – (White / Clear / Black / Customize color)
	• PMMA / Acrylic – (Clear / Translucent / White / Black / Customize color)
	• PA / Nylon – (White / Black / Clear / Customize color / +30%GF)
	• PP / Polypropylene – (White / Black / Gray / Translucent / Customize color /+20% GF)
	• POM / Polyformaldehyde / Delrin – (White / Black / Customize color)
	• PPS / Polyphenylene sulfide – (White / Black / Brown / Customize color)
	• PVC / Polyvinyl chloride – (Beige / White / Gray / Clear / Customize color )
	• PEI / Polyetherimide – (Transparent Amber / Black / Customize color)
	• PTFE / Polytetrafluoroethylene – (White / Black / Gray / Clear / Customize color)
	• PEEK / Polyether ether ketone – (Natural / Black / White / Brown / Customize color )
	• Resin – (White / Black / Customize color)
	• Rubber – (Black / White / Clear / Customize color)
	• Silicone – (Clear / White / Black / Customize color)
	• TPU – (Clear / White / Black / Customize color)
	• TPE – (Clear / Translucent / White / Black)
	• PU – (Black / Coffee) ,etc.

Material	• Aluminum – (6061 / 7075 / 6082 / 5052 / 6063 / 2A12 …)
	• Brass-(C36000(C26800) C37700(HPb59) C38500(HPb58) C27200(CuZn37) C28000 …)
	• Copper – (C10100 / C10200 / C11000 / C12000 / C14200 …)
	• Steel – (20# 45# Q235 / A3 40Cr …)
	• Stainless Steel – (302 / 303 / 304 / 316 / 310 / 420 …)
	• Iron – (1213/12L14 / 1215 …)
	• Bronze – (C51000 / C521000 / C54400 …)
	• Magnesium – (AZ31B / AZ61A / AZ91D …)
	• Zinc – (ZnAl4Cu1 / ZnAl4 / ZnAl2Cu1 / ZnAl2 / ZnAl1Cu3 ….)
	• Titanium
	• Carbon fiber ,etc.