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Marinite® P Replacement:
Super Firetemp® S and Promat MONOLUX®

BNZ Materials has permanently discontinued the Marinite product line, and Marinite P is final, non-restocking inventory. AWMCO offers two recommended replacements for Marinite P in calcium silicate insulation applications: Super Firetemp S, a Johns Manville calcium silicate board rated to 1700°F and available with monthly restocking, and Promat MONOLUX 800, a dense structural calcium silicate board with continuous service rating to 800°C (1472°F) and classification to 1000°C (1832°F), sourced to order through AWMCO. Both are inorganic, non asbestos, non-combustible calcium silicate boards combining thermal insulation with mechanical strength — used in furnace walls, kiln components, platen press liners, fire door cores, and fabricated heat shields. Super Firetemp S matches Marinite P's published flexural strength at 1400 psi. MONOLUX 800 exceeds Marinite P's bending strength and provides EN-compliant A1 non combustible classification. Contact AWMCO to discuss which replacement fits your application.

Shop Super Firetemp S Request Promat MONOLUX Info

Marinite® P vs. Super Firetemp® S vs. Promat MONOLUX® 800 — Spec Comparison

Specification BNZ Marinite® P Super Firetemp® S Promat MONOLUX® 800
Manufacturer BNZ Materials Johns Manville Promat (Etex Group)
Density 60 pcf (~961 kg/m³) 55 pcf (~881 kg/m³) 59 pcf (950 kg/m³)
Max Service Temperature 1200°F (649°C) 1700°F (927°C) 1472°F (800°C) continuous / 1832°F (1000°C) classification
Flexural / Bending Strength 1400 psi 1400 psi ~1450 psi (~10 N/mm²)
Compressive Strength 5850 psi @ 10% deformation 4200 psi @ 10% deformation >3916 psi (>27 N/mm²) cold
Thermal Conductivity @ ~400°F / 200°C 1.13 Btu-in/(hr-ft²-°F) 0.97 Btu-in/(hr-ft²-°F) 0.20 W/m·K @ 200°C
Thermal Shrinkage 0.6% (L/W) @ 1200°F (649°C) / 24h 0.6% (L) / 0.7% (W) @ 1700°F (927°C) / 24h <0.8% @ 1832°F (1000°C) / 24h
Asbestos-Free Yes Yes Yes
Building Material Class Non-combustible Non-combustible A1, Non-combustible (EN 13501)
Sheet Size 48" x 96" (1219 x 2438 mm) 48" x 96" (1219 x 2438 mm) 47″ × 98″ (1200 × 2500 mm)
Quality System — ISO 9001 —
Availability Limited stock — final inventory In stock — monthly restocking Sourced to order — contact AWMCO
Custom Cutting Available Available Available
Supply Status Discontinued — BNZ no longer manufacturing Ongoing supply Currently available

Spec note: Compressive strength values use different test standards (ASTM 10% deformation for Marinite P and Super Firetemp S; EN 826 cold compressive for MONOLUX 800) and are not directly comparable. Thermal conductivity is presented in both Btu-in/(hr-ft²-°F) and W/m·K from different test conditions — comparison is directional only. MONOLUX 800 is a structural thermal and fire protection board and is not classified as an aluminum contact board. For molten aluminum contact applications, see Promat MONALITE® M1T or M1AT.

Two Replacements for Marinite P — Which Is Right for Your Application?

BNZ Materials — the manufacturer of Marinite — has permanently closed its Marinite production facility. The Marinite P shown on the AWMCO website is our last available inventory. It will not be replenished. Two qualified replacement options are available, and the right choice depends on your supply requirements and application:

  • Super Firetemp S — In stock, monthly restocking, matching flexural strength

    Super Firetemp S matches Marinite P's published flexural strength of 1400 psi, making it an equivalent bending-performance replacement for panel, support, and fabricated component applications. Available now from AWMCO with monthly restocking under Johns Manville's ISO 9001 quality management system, Super Firetemp S is the immediate-supply, domestically sourced option for operations transitioning off Marinite P.

  • Promat MONOLUX 800 — Higher Bending Strength, EN A1 Classified

    MONOLUX 800 publishes a bending strength of ~10 N/mm² (~1,450 psi) — slightly higher than Marinite P's 1400 psi. At ~59 pcf (950 kg/m³), it is the closest density match to Marinite P (60 pcf) of the two options. MONOLUX 800 carries A1 (non combustible) building material class per EN 13501 — making it the appropriate choice for applications where European standard compliance is required. Cold compressive strength exceeds 27 N/mm² (>3,916 psi).

  • Supply chain certainty

    Marinite P stock at AWMCO is finite. As authorized distributors for both Johns Manville Super Firetemp S and Promat MONOLUX 800, AWMCO can supply replacement materials for ongoing production needs. Super Firetemp S is regularly restocked, while MONOLUX 800 is available by order. Both products can be supplied in full sheets or precision-cut 12" × 12" squares.

Is Super Firetemp S a Direct Drop-In for Marinite P?

For most applications, yes. Marinite P and Super Firetemp S are both:

•      Non-asbestos, inorganic, non-combustible calcium silicate boards

•      Machinable — cut, drilled, and fabricated with standard tools

•      Available in 4 ft × 8 ft sheets with custom cutting through AWMCO

•      Rated for high-temperature industrial use (Super Firetemp S at 1700°F continuous)

•      Matching published flexural strength — both at 1400 psi

The primary differences are compressive strength (4,200 vs. 5,850 psi at 10% deformation) and density (55 vs. 60 pcf). In most furnace wall, press liner, kiln component, and fabricated heat shield applications where Marinite P has been the specified material, Super Firetemp S performs as a technically credible substitution. For applications with strict compressive load requirements, or where 2-inch thickness is required, contact AWMCO for a technical review.

Is MONOLUX 800 a Direct Drop-In for Marinite P?

For applications where density match and bending strength are the primary specification drivers, MONOLUX 800 is a strong substitution:

•      Density match: MONOLUX 800 at 950 kg/m³ (~59 pcf) is within 2% of Marinite P's 60 pcf

•       Bending strength advantage: MONOLUX 800 at ~10 N/mm² (~1,450 psi) slightly exceeds Marinite P's 1,400 psi

•      Compressive strength: >27 N/mm² (>3,916 psi) cold per EN 826

•      EN compliance: A1 building material class per EN 13501 and continuous service to 800°C with 1000°C classification

MONOLUX 800 is a structural thermal and fire protection board — it is not classified as an aluminum contact board and does not carry non-wetting properties for molten metal contact. For applications requiring aluminum contact board performance, Promat MONALITE products are the appropriate option.

Common Applications

Super Firetemp S and MONOLUX 800 replace Marinite P in the following applications:

•      Industrial furnace wall panels and backup insulation

•      Platen press liners and hot-press face plates

•      Oven and kiln structural supports and sidewall lining

•      Fabricated machined component shapes

•      Fire door cores and assemblies

•      Thermal barriers and heat shields

•      Welding and torch protection panels

•      Petrochemical and refinery insulation panels

•      Structural insulation for high thermal and mechanical load environments

Order Super Firetemp S or MONOLUX 800 from AWMCO

AWMCO is an authorized distributor for Johns Manville Super Firetemp S and Promat MONOLUX. Super Firetemp S is in stock and available to
order online. MONOLUX is available by order. Contact us for lead times, pricing, and custom cutting to your part dimensions.

Shop Super Firetemp S Request Promat MONOLUX Quote — Contact AWMCO

Frequently Asked Questions — Marinite P, Super Firetemp S, and Promat MONOLUX

What is the best replacement for BNZ Marinite P?

AWMCO offers two recommended replacements for BNZ Marinite P. Super Firetemp S, manufactured by Johns Manville, is the in-stock option — matching Marinite P's 1400 psi flexural strength, rated to 1700°F, and available with monthly restocking under ISO 9001 quality controls. Promat MONOLUX 800 is the option for applications requiring a closer density match (~59 pcf vs. Marinite P's 60 pcf), slightly higher bending strength (~10 N/mm² vs. 1400 psi), or EN 13501 A1 non-combustible compliance. Contact AWMCO to discuss which product fits your application.

Does Super Firetemp S match the compressive strength of Marinite P?

Not at the 10% deformation threshold. Marinite P publishes 5,850 psi at 10% deformation; Super Firetemp S publishes 4,200 psi at 10% deformation. Both are high-compressive-strength boards well above typical calcium silicate applications. For applications with heavy structural loads, verify your actual load, contact area, allowable deformation, and safety factor before approving substitution.

How does Promat MONOLUX 800 compare to Marinite P in density?

Very closely. MONOLUX 800 has a density of approximately 950 kg/m³ (~59 pcf), compared to Marinite P's 60 pcf — within 2% of the same density class. For applications where density specification is critical, MONOLUX 800 is the closest match to Marinite P among the available replacements.

Is Super Firetemp S a better insulator than Marinite P?

Yes, based on published data. Super Firetemp S has lower thermal conductivity than Marinite P at 400°F, 600°F, and 800°F mean temperatures — indicating better heat containment and insulation efficiency.

Is MONOLUX 800 an aluminum contact board like Marinite P?

No. MONOLUX 800 is a structural thermal and fire protection board — it does not carry aluminum contact board (non-wetting to molten metal) classification. Marinite P was also not an aluminum contact board; it was a high-strength structural calcium silicate board used in furnace walls, press liners, and thermal barriers. MONOLUX 800 fills the same structural thermal and fire protection roles. For applications requiring non-wetting aluminum contact board properties, Promat MONALITE products (M1T or M1AT) are the appropriate choice.

Why is Marinite P no longer available from BNZ Materials?

BNZ Materials, the manufacturer of the Marinite product line, has permanently closed its production facility. AWMCO has limited Marinite P inventory and is no longer able to reorder any Marinite P due the closure. This stock will not be replenished once sold. AWMCO stocks Super Firetemp S and sources Promat MONOLUX 800 as the recommended replacements. Contact AWMCO for availability and lead times.

Does AWMCO still have Marinite P in stock?

Yes — as of the date this page was published, AWMCO has limited quantities of BNZ Marinite P remaining. This is final inventory and will not be restocked. Order now to secure remaining supply, or transition to Super Firetemp S (in stock, monthly restocking) or Promat MONOLUX 800 for long-term sourcing continuity.

Does Super Firetemp S come in 2-inch thickness?

No — Super Firetemp S is published in 1/2, 3/4, 1, and 1-1/2 inch thicknesses in standard 4 ft × 8 ft sheets. If your application requires 2-inch thickness (which Marinite P lists), contact AWMCO — we can review whether laminating or alternative Super Firetemp grades can meet your thickness requirement. Availability of MONOLUX 800 in thicker profiles can also be confirmed at time of order.

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