Rotational Molding Molds Comparison

Rotational molding aluminum molds are usually made of aluminum alloy and processed by computer numerical control (CNC). This kind of mold is much thicker and more complicated than the one made of steel plate, with great changes in surface polishing and color.

It boasts relatively free design, uniform wall thickness, and strong durability. For cooler boxes, a set of shell molds and a set of foaming fixtures are required, which can create high-quality appearance and texture, just like the rotomolded cooler boxes of YETI and RTIC.

In contrast, steel plate molds are made of welded steel plates, which are much cheaper in material cost. The processing only requires welding and no precision machining, so they are commonly used for manufacturing large septic tanks, water tanks, fish tanks, and other simple and rough products.

Key Differences Between Forged Aluminum Molds and Steel Plate Molds

Aspect	Forged Aluminum Molds	Steel Plate Molds
Weight & Portability	- Lightweight due to aluminum's low density - Reduced transportation and handling costs - Less reliance on heavy lifting equipment - Ideal for active lifestyles and daily use	- Heavier due to steel's high density - Increased sturdiness, but demands higher transportation and installation requirements
Durability & Lifespan	- Moderate durability, suitable for general use - May exhibit damage or deformation under extreme conditions - Shorter lifespan compared to steel in harsh environments	- High strength and wear resistance - Excellent durability, withstands impact and abrasion - Longer lifespan, suitable for rugged applications
Heat Dissipation	- Superior thermal conductivity of aluminum - More efficient heat transfer from inside to outside - Ideal for situations requiring quick heat dissipation	- Lower thermal conductivity of steel - May require additional heat dissipation measures - Less efficient heat transfer compared to aluminum
Production Cost	- Higher cost due to material and processing complexity - Aluminum pricing is relatively stable, but precision equipment and techniques are required	- Lower raw material cost - Mature welding processing technology - Overall lower production cost
Main Process	Drafting → Wood mold making → Resin mold → Casting → Computer numerical control (CNC)	Welding
Appearance & Texture	- Modern, sleek, and refined appearance - High gloss and fine texture enhance overall product quality - Used by premium brands like YETI COOLER, RITC COOLER	- Rough surface texture without special treatments - Limited design flexibility due to higher shrinkage rates in molding process
Applicable Products	10-200QT rotomolded coolers, Tool box and so on. Click to view	200-1000L insulated fish tubs, large septic tanks, water tanks, fish tanks, and other simple and rough products. Click to view
Ref. Product Pictures
Shell Mold Pictures
PU Formed Fixture Molds (Only cooler box have)	Aluminum material too	Wood, or steel Picture will update soon.
Advantages	Lightweight & High-Strength Products: Aluminum alloy molded using these molds combines light weight with high strength, providing a significant advantage for industries that prioritize weight reduction, such as aerospace and automotive. Precision Craftsmanship: The rotational molding process ensures precision in the final products, yielding aluminum alloy parts with smooth surfaces and exact dimensions, making them ideal for demanding applications in electronics, communications, and beyond. Increased Production Efficiency: By enabling the simultaneous molding of multiple products, aluminum alloy rotational molding molds significantly reduce production time and boost overall productivity, leading to cost savings and faster time-to-market. Design Flexibility: The remarkable plasticity of aluminum alloy during the rotational molding process allows for the creation of intricate and customized shapes, fostering creativity and enabling the production of unique, tailored products that meet specific customer requirements.	Price Advantage: Apart from extremely small rotational molds, for medium-sized molds, if steel plate molds are selected for production, the mold cost can be reduced by at least one-third. Ease of Modification: Compared to aluminum molds, steel plate molds are easier to modify, repair, and maintain with simplified maintenance procedures. Energy Efficiency: The use of steel plate molds, with their wall thickness of only 2.5 or 3.0mm, shortens the powder melting time during the rotational molding process, thereby reducing energy consumption to a certain extent. Precision with Traditional Craftsmanship: By combining traditional craftsmanship with numerical control technology, precise rotational molds can still be produced. Within the rotational molding industry, the application of steel plate molds is quite extensive.

Pictures of Different Molds

Aluminum Molds:

Steel Plate Molds:

In conclusion, the choice between forged aluminum molds and steel plate molds for roto-molded insulated coolers depends on a multitude of factors, including application scenarios, cost considerations, product specifications, and market demands.