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Marinite® C Replacement: Promat MONALITE® – M1T
Aluminum Contact Board

BNZ Materials has permanently discontinued the Marinite product line, and Marinite C is final, non-restocking inventory. Marinite C was the original non-asbestos aluminum contact board — widely used in launders, trough linings, spouts, floats, stoppers, dams, baffles, and basins in aluminum casting and non-ferrous foundry operations. AWMCO sources Promat MONALITE–M1T, a calcium silicate aluminum contact board manufactured by Promat and classified to 1000°C (1832°F) — a recommended replacement for Marinite C in molten aluminum and non-ferrous metal contact applications. Like Marinite C, MONALITE M1T is non-asbestos, non-wetting to molten non-ferrous metals, and precisely machinable to close tolerances. MONALITE M1T delivers improved dimensional stability and higher compressive strength compared to Marinite C. Contact AWMCO for lead times, pricing, and custom cutting.

Request Promat MONALITE - M1T Info

Marinite® C vs. Promat MONALITE® – M1T : Spec Comparison

Specification BNZ Marinite® C Promat MONALITE® – M1T
Manufacturer BNZ Materials Promat (Etex Group)
Density 54 pcf (865 kg/m³) 53 pcf (850 kg/m³)
Classification / Max Service Temperature 1500°F (816°C) aluminum contact 1832°F (1000°C)
Modulus of Rupture / Bending Strength 900 psi (≤1.5″ thick) >870 psi (>6 N/mm²)
Compressive Strength 1600 psi @ 5% deformation ~2901 psi (≤20 N/mm²) cold
Thermal Conductivity 0.110 W/m·K @ 400°C 0.274 W/m·K @ 200°C; 0.283 @ 500°C; 0.294 @ 800°C
Thermal Shrinkage (L/W in service) 2.3% @ 1350°F (732°C) / 24 hrs <0.5% @ 1382°F (750°C) / 12 hrs
Non-Wetting to Molten Non-Ferrous Metals Yes Yes
Asbestos-Free Yes Yes
Building Material Class Non-combustible A1, Non-combustible
Sheet Size 48" × 96" (1219 × 2438 mm) 47″ × 98″ (1200 × 2500 mm)
Quality System ISO 9002 —
Availability Limited stock — final inventory Sourced to order — contact AWMCO
Custom Cutting Available Available
Supply Status Discontinued — BNZ no longer manufacturing Currently available

Spec note: Bending and compressive strength values are measured under different test standards (ASTM C 99 / BNZ method vs. EN 993-5/6) and are not directly equivalent. Both products are non-wetting aluminum contact boards in the same density class (~53–54 pcf). Thermal conductivity values are published at different temperatures: Marinite C at 400°C; MONALITE M1T at 200°C, 500°C, and 800°C per the official Promat datasheet — Marinite C is the better thermal insulator across the full temperature range. MONALITE M1T's shrinkage limit of <0.5% at 750°C/12h is dramatically lower than Marinite C's 2.3% at 732°C/24h. Sheet dimensions differ — MONALITE M1T ships in metric format (~98″ × 47″); confirm cut sizes with AWMCO at time of order.

Why Foundry Engineers Are Switching from Marinite C to MONALITE M1T

BNZ Materials — the manufacturer of Marinite — has permanently closed its Marinite production facility. The Marinite C shown on the AWMCO website is our last available inventory. It will not be replenished. MONALITE M1T was selected as the recommended transition product for three reasons:

  • Same core job — non-wetting, machinable, aluminum contact

    MONALITE M1T was engineered for the same operational environment Marinite C served: direct contact with molten aluminum and non-ferrous metals. It does not wet, does not react with boron nitride or graphite lubricants, and machines cleanly to close tolerances with standard wood or metal processing equipment. Skull removes cleanly. For launder linings, spouts, floats, stoppers, baffles, and basins — the applications Marinite C was built for — MONALITE M1T is a functionally compatible replacement.

  • Dramatically Better Dimensional Stability

    One of Marinite C’s known limitations was higher thermal shrinkage — 2.3% in length and width after 24 hours at service temperature. MONALITE M1T’s thermal shrinkage in length and width is less than 0.5% at 750°C (1382°F) over 12 hours — dramatically lower. For applications where part dimensions need to remain stable in service, this is a significant performance improvement over Marinite C.

  • Higher Compressive Strength

    MONALITE M1T publishes a cold compressive strength of ≤20 N/mm² (~2,901 psi), compared to Marinite C’s 1,600 psi at 5% deformation. For launders, filter boxes, and other structural foundry components where resistance to mechanical loading matters, MONALITE M1T provides a more robust material platform.

Is MONALITE - M1T a Direct Drop-In for Marinite C?

For most standard aluminum contact board applications, yes — with one trade-off to evaluate.

Both are:

•      Non-asbestos, non-combustible calcium silicate boards designed for molten non-ferrous metal contact

•      Non-wetting — metal does not adhere, skull removes cleanly, no foundry wash required

•      Precisely machinable — cut, drilled, and shaped to close dimensional tolerances with conventional equipment

•      In the same density class — 54 pcf (Marinite C) vs. ~53 pcf (MONALITE M1T)

Main differences to evaluate before substitution:

Thermal conductivity — Marinite C has lower thermal conductivity than MONALITE M1T (0.110 W/m·K at 400°C vs. 0.274–0.294 W/m·K at 200–800°C per the Promat official datasheet), meaning Marinite C is the better insulator. For applications where thermal insulation is the primary function — such as launder backup lining or heat retention applications — review whether the higher conductivity of MONALITE M1T is acceptable. For structural and contact applications where insulation is secondary, this difference is typically not operationally significant. Contact AWMCO for a technical review if your application is insulation-critical.

Sheet format — MONALITE M1T is supplied in 1200 × 2500 mm metric sheets. AWMCO cuts to size — confirm part dimensions at time of order.

Dimensional stability advantage — For operations where Marinite C’s known shrinkage caused fit or tolerance issues in service, MONALITE M1T’s dramatically lower shrinkage (<0.5% vs. 2.3% L/W) is a meaningful upgrade.

Common Applications

MONALITE M1T replaces Marinite C in the following aluminum foundry and non ferrous casting applications:

•      Launder and trough linings

•      Spouts and floats

•      Stopper pins and plugs

•      Distribution boxes, dams, and baffles

•      Basins and filter boxes

•      Head boxes for continuous casters

•      Tips and nozzles for continuous sheet casters

•      Sprue bushes and feeder box liners in low pressure die casting

•      Working linings for dosing and holding furnaces

•      Structural contact components where dimensional stability is required

Order MONALITE - M1T from AWMCO

AWMCO is an authorized Promat distributor for MONALITE M1T. Contact us for lead times, pricing, and custom cutting to your part dimensions.

Request Promat MONALITE M1T Quote — Contact AWMCO

Frequently asked questions about Marinite C and Promat MONALITE - M1T

What is the best replacement for BNZ Marinite C in aluminum casting applications?

Promat MONALITE M1T is a recommended replacement for BNZ Marinite C. It is a non-asbestos calcium silicate board classified to 1000°C (1832°F), non-wetting to molten non-ferrous metals, and precisely machinable to close tolerances. AWMCO sources MONALITE M1T through Promat — contact AWMCO for lead times and pricing.

Is MONALITE M1T non-wetting to molten aluminum like Marinite C?

We want to speak to you too! Contact us with any questions, concerns, or feedback. We will be sure to get back to you within 48 hours. However, please note that inquiries sent on Fridays will receive a reply the following Monday, but possibly sooner.

Does MONALITE M1T have better dimensional stability than Marinite C?

Yes — significantly better. Marinite C’s published thermal shrinkage in length and width is 2.3% after 24 hours at service temperature. MONALITE M1T’s published shrinkage limit is less than 0.5% after 12 hours at 750°C (1382°F) — significantly lower. For applications requiring tight dimensional tolerances in service, MONALITE M1T is a substantial upgrade.

Is MONALITE M1T as good an insulator as Marinite C?

No. Marinite C has lower thermal conductivity (0.110 W/m·K at 400°C) compared to MONALITE M1T (0.274 W/m·K at 200°C, rising to 0.294 W/m·K at 800°C per the official Promat datasheet), meaning Marinite C is the better thermal insulator. For structural contact applications where machinability, non-wetting, and dimensional stability are the primary drivers, the difference in conductivity is generally not operationally significant. Contact AWMCO for a technical review if your application is insulation-critical.

Can MONALITE M1T be machined to close tolerances like Marinite C?

Yes. MONALITE M1T has a homogeneous, fine-pored structure described as ideal for clean, precision machining. It can be shaped with standard wood or metal processing equipment. Dust extraction is recommended. AWMCO also offers custom cutting — contact us with your part dimensions and quantities.

Why is Marinite C no longer available from BNZ Materials?

BNZ Materials, the manufacturer of the Marinite product line, has permanently discontinued Marinite production. AWMCO has sold through its remaining Marinite C inventory — this stock will not be replenished. AWMCO sources Promat MONALITE M1T as the recommended replacement.

Does AWMCO still have Marinite C in stock?

No — AWMCO has sold through all of its remaining BNZ Marinite C. This will not be restocked. Contact AWMCO to transition to Promat MONALITE M1T for long-term sourcing continuity

What sheet sizes does MONALITE M1T come in?

MONALITE M1T is supplied in 1200 × 2500 mm metric sheets (approximately 47" × 98"), which differs from Marinite C’s standard imperial 4 ft × 8 ft format. AWMCO cuts to your specified dimensions. Available thicknesses include approximately 12.7, 19.1, 25.4, 38.1, 50.8, 76.2, and 101.6 mm (1/2" through 4").

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