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Rigid fire-protection insulation

SilthermPanel FP

Thin, lightweight insulation for fire-rated door assemblies.

A custom-made microporous panel for elevator landing doors and other fire-rated constructions with limited internal depth.

Siltherm Panel FP rigid glass-cloth encapsulated insulation panel
See the door-system approachDiscuss a Panel FP assembly

Designed for constrained door leaves

Fire protection without giving away unnecessary space or weight.

Panel FP combines low conductivity with custom dimensions in a clean glass-cloth envelope. It is made to fit the door leaf rather than force the leaf around a standard panel.

Siltherm Panel FP rigid glass-cloth encapsulated insulation panel
Custom-made rigid panel / glass-cloth envelope
01

Slim construction

12-40 mm standard thickness

Low thermal conductivity supports compact insulation build-ups where the available door-leaf depth is limited.
02

Large custom format

Up to 3000 x 700 mm

Custom-made panels reduce unnecessary joints and can be coordinated with the required door geometry.
03

Clean integration

E-glass cloth envelope

The encapsulated panel is clean to handle and can be cut, shaped, drilled or punched when the approved construction requires it.

Conceptual door-leaf integration

Exposed faceDoor skin / structural build-up
Insulation zoneSiltherm Panel FP
Protected faceDoor skin / system interfaces
Final layer order, joints, hardware and fixings follow the tested door assembly.

Door-leaf integration

Designed around the complete landing-door construction.

Panel FP fits inside the door leaf as one part of the rated construction. Its layout follows the skin, frame and hardware zones used in that assembly.

  1. 01

    Fit the available envelope

    Coordinate panel thickness, dimensions and layout with the internal door-leaf space.

  2. 02

    Control edges and fixings

    Define cut-edge sealing and the use of adhesive, retaining pins, clips or anchors within the construction.

  3. 03

    Keep the system boundary intact

    Door leaf, frame, hardware, joints and installation must match the tested and classified configuration.

Product performance

Technical data for compact fire-protection design.

Panel FP combines a Grade 1000 FP microporous core with an E-glass cloth envelope. The values below describe the product and pure-core specimens.

Classification temperature
1000 °C
Standard thickness
12-40 mm
Maximum panel size
3000 x 700 mm
Other sizes may be available on demand
Nominal density
280 kg/m³ ±10%
Cold compressive strength
0.30 MPa
10% deformation / ASTM C165
Linear shrinkage
≤2.5%
24 h at 1000 °C / ASTM C356 / pure core

Pure-core thermal conductivity

0.022 W/m·K200 °C
0.023 W/m·K400 °C
0.027 W/m·K600 °C
0.034 W/m·K800 °C
ASTM C177 / mean temperature / microporous core specimen

Elevator fire-performance framework

Read the rating through E, I and W.

EN 81-58 reports elevator landing-door performance through integrity, insulation and heat-radiation criteria for the tested assembly.

Instrumented elevator landing-door assembly prepared for fire-resistance testing
Landing-door assembly prepared for fire-resistance testing
E

Integrity

Assesses sustained flaming on the unexposed face and whether openings permit the specified gauges to pass through the assembly.

I

Insulation

Assesses temperature rise on the unexposed face, including average, local maximum and door-frame measurement limits.

W

Heat radiation

Assesses radiated heat from the unexposed side against the applicable heat-flux criterion.

Selected assessment thresholds

  • Average temperature rise ≤ 140 °C
  • Maximum point rise ≤ 180 °C
  • Door-frame point rise ≤ 360 °C
  • Critical heat flux ≤ 15 kW/m²

Referenced fire-test frameworks

  • EN 81-58
  • GB/T 27903-2011
  • BS 476
  • AS 1530.4:1997
  • GOST 30247.3-02

The applicable standard, duration and E/I/W classification must be confirmed against the current test report, door construction and project jurisdiction.

Application routes

Built for doors and barriers where every millimetre matters.

Panel FP is configured as part of the protected construction, with panel layout and fixing matched to the door design.

01

Elevator landing doors

Custom panel geometry for landing-door systems balancing fire-performance requirements, limited leaf depth and operating weight.

Discuss this assembly 02

Industrial fire doors

Rigid insulation for door leaves where panel thickness, handleability and repeatable component integration are design priorities.

Discuss this assembly 03

Fire-barrier systems

Microporous insulation configured within defined barrier constructions with reviewed joints, interfaces and supporting evidence.

Discuss this assembly

Project documentation

Match product data to the tested door assembly.

A defensible fire-performance statement identifies the complete tested assembly, installation, applicable standard, report scope and current authorization. Product data alone does not assign a door-system rating.

Product document
Siltherm Panel FP Product Data Sheet
Current revision
July 2025
Primary elevator context
EN 81-58 landing-door systems
Technical follow-up
Current data and assembly review from Siltherm

Controlled technical document

Siltherm Panel FP

Siltherm Panel FP Product Data Sheet / July 2025

Provide your professional details to request the current controlled copy. No project drawing or confidential design information is required.

Your request will be sent to the Siltherm team so a specialist can provide the current document and respond to relevant technical questions.

Document requests are temporarily unavailable.

Start with the door-system brief

Make fire protection fit the door design.

Tell us the door type, target rating and available insulation depth. We will review a suitable Panel FP configuration and the supporting information.

Discuss a Panel FP assemblyUse the first enquiry for non-confidential application information only.
Thermal CalculationEngineering support