Honeycomb Filters
for Metal Filtration

Ceramic honeycomb filters remove non-metal impurities and gas, purifying and making the metal liquid steady.  As a result, they reduce the casting costs and improve the quality of the product, making it the superior product to other options like 3D-printed and foam filters.

Top Reasons More Customers
Switching to Holy Filters

When it comes to metal filtration, many people are unaware of a ceramic honeycomb filter's superiority.  The product features include a large surface area, increased flow-rate, high mechanical strength, product consistency, and excellent thermal shock resistance.

ACI 2016 Product-54

Extremely easy
to use & maintain

  • no cleaning required
  • drop in and use
  • no shedding or breakage
  • eliminates splash
  • custom tapering & wrapping
ACI 2016 Product-217

Cost Savings

  • 45% less scrap
  • 30% more throughput
  • 20% re-work reduction
  • long-term partnership reliability
  • increased yield
ACI 2016 Product-75

Product Features

  • uniform laminar flow
  • increased flow rate
  • custom sizes & shapes available
  • better filtration with superior flow
  • high mechanical strength & consistency
  • excellent thermal shock resistance

Additional Advantages of
Ceramic Honeycomb & Holy Filters

Over the last 40 years, ACI has developed and optimized material formulations that deliver peak performance in various applications. Materials include Mg stabilized Zirconia, Zirconia Mullite, Alumina, and a proprietary L3MM.


A primary performance indicator for a filter is that it CANNOT INTRODUCE foreign material into the casting. Ceramic Honeycomb, with its unique design & laminar flow, it doesn't introduce foreign materials - unlike filters using tortuous path filtration.


When comparing our Holy Filters to a foam filter, one customer says:

“I think with higher volume the yield will settle in with an improvement range of 9-12%.”


ACI’s proprietary L3MM formula offers the performance of a zirconia filter with the cost of a mullite filter.


Relative to foam filters, the honeycomb filters have the advantage of being able to be made thinner, which provides better pricing and performance.


Ceramic honeycomb filters are used in the metallurgical and foundry industry due to its product features with large surface area, high mechanical strength, product consistency, and excellent thermal shock resistance.

With its unique straight channel honeycomb designs, it increases the specific surface area between molten metal and ceramic filter. This improves the filtration of dross, gas and other non-metal impurities, purifying and making the metal liquid flow steady.

As a result, it reduces the casting costs and improves the quality of the product. High grades of raw material and accurate processing make the quality of ceramic honeycomb filters extremely stable and consistent.

Many aerospace, automotive, medical and other industrial applications utilize ACI’s ceramic honeycomb filters to improve casting reliability.

We take the customer experience seriously. We listen to our customers and identify their needs, and then offer the best solution to meet or exceed those needs. We respond quickly and always deliver the goods.


Ceramic honeycomb filters are the best option if the company needs superior cleaning or casting ability. There are many multiple shapes available, but most are square, rectangle or round.


Typical Sizes Minimum Maximum
Length or Diameter (in) .5" 6"
Width (in) .5" 6"
Height (in) .25" 1"
CPSI 16 500

*other sizes and shapes available upon request


Laminar Flow vs. Turbulent Flow

Using a ceramic honeycomb filter improves the quality of molten metal flow.  The ceramic honeycomb filters create laminar flow which is superior to turbulent flow.  When the molten liquid metal passes through the ceramic honeycomb channel, the debris, the slag and other inclusions are removed.  A stable and fast laminar molten metal flow prevents air from getting into the molten metal flow, molten metal getting oxidized and splashing out.

Comparable foam filters have a wide variation in the amount of time it takes liquid to flow through them.  Although the result of the designed random pattern creates the “tortuous path”, it increases the time variability and the “splash” effect.  Even from filter to filter in the same exact size and PPI the flow can vary considerably (+/- seconds), even in the same filter from pour to pour.  This can create problems when trying to control the solidification of the crystals during casting.

The honeycomb filters have very consistent flow as well as generating laminar flow.  Having more laminar flow prevents splashing and void inclusions in the castings.



Depending on your company’s needs, our products can be designed specifically for your flow control, strength, and performance. Applied Ceramics began manufacturing ceramic honeycomb in 1980. Since then, ACI continues to offer our world-class engineering support to create more value for its customers and partners and selling into this market since 1984.


Want to save costs while
improving quality?

Our ceramic honeycomb filters for molten metal do exactly that - let's have a conversation around any technical questions you might have and the positive impacts this sort of change will have on your business.

About Holy Filters

Holy Filters (Applied Ceramics) brings its customer focus aligned with its materials, tooling and manufacturing expertise to provide breakthrough solutions that change the world. Since 1967, we have provided value through performance, cost savings, new product development or customized solutions.

ACI maintains and cultivates its ceramic process and materials technology. We take on multiple research and development projects each year to further our capability and expertise. We also operate two full-service labs to support these efforts as well. Going back to 1980, we have maintained a heavy focus on product development and research with a high percentage of sales each year going to new products that were sold the previous year. To further this, the company employs a strong contingent of Materials Science engineers partnered with multiple Ph.D. and Master's degree ceramic engineers and scientists.

Visit Applied Ceramics Website

Let's Have a Conversation

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(813) 727-2446