Seating Module Frame for Modular Sofas | Component Specifications

Product Specifications

Technical details and manufacturing context for Seating Module Frame

Definition

The Seating Module Frame is the foundational structural component of a modular sectional sofa system, providing the rigid support structure for individual seating units. It determines the shape, dimensions, and load-bearing capacity of each module, ensuring stability and durability while allowing for modular connection and reconfiguration within the overall sofa system. The frame is typically constructed from materials such as hardwood, plywood, engineered wood, or steel tubing, each offering different trade-offs in weight, strength, and cost. Its design must accommodate the intended seating load, which for residential use typically ranges from 150 to 250 kg per seat, as referenced in EN 12520. The frame's overall width, depth, and height are specified in millimeters, with typical ranges of 600–900 mm, 500–800 mm, and 300–450 mm respectively, excluding cushions. These dimensions influence the module's footprint and seating comfort. The frame weight, ranging from 8 to 15 kg, affects shipping and handling logistics. Material thickness, particularly for steel frames, is typically 1.5–3.0 mm, and tensile strength for steel is referenced to ASTM A36 with values between 350 and 550 MPa. Surface treatments, such as epoxy coatings of 60–120 μm, are applied to enhance corrosion resistance, with performance verified through salt spray testing per ISO 9227. Dimensional tolerances are maintained within ±2 mm to ensure proper alignment during assembly, as per ISO 2768-m. The frame is designed to operate within a temperature range of -20 to 60 °C and withstand humidity up to 95% RH without warping or rusting. Fire retardancy is addressed through compliance with EN 1021-1, which is a cigarette test required for public seating applications. As a component, the frame serves as the attachment base for upholstery, cushions, and connecting mechanisms, ensuring stability under normal seating loads. It is essential to verify model-specific values and standards with the legal manufacturer or supplier, as the listed ranges are for reference only.

Working Principle

The frame provides structural integrity through its rigid construction, distributing weight evenly across its support points. It serves as the attachment base for upholstery, cushions, and connecting mechanisms, while maintaining dimensional stability under normal seating loads and usage conditions. The frame's geometry and material selection determine its load-bearing capacity and resistance to deformation. For steel frames, the tensile strength and material thickness are critical factors. The frame's dimensional tolerance ensures that modules align correctly when connected, allowing for reconfiguration. The surface treatment protects against corrosion, and the fire retardancy standard ensures safety in public settings. The frame must be verified for specific load requirements and environmental conditions.

Common Materials

Hardwood, Plywood, Engineered Wood, Steel Tubing

Technical Parameters

Parameter	Typical range	Notes & selection driver
Overall Width	600–900 mm	Determines seat width and module footprint.
Overall Depth	500–800 mm	Affects seat depth and comfort.
Overall Height	300–450 mm	Includes frame only, not cushions.
Load Capacity	150–250 kg	Static load per seat; higher for commercial use.EN 12520
Frame Weight	8–15 kg	Affects shipping cost and handling.
Material Thickness	1.5–3.0 mm	Steel or aluminum; thicker for higher load.
Surface Treatment	Epoxy 60–120 μm	Corrosion resistance; salt spray test hours.ISO 9227
Tensile Strength	350–550 MPa	For steel frame material.ASTM A36
Dimensional Tolerance	±2 mm	Ensures module alignment in assembly.ISO 2768-m
Operating Temperature	-20–60 °C	Material performance and coating integrity.
Humidity Resistance	≤95 % RH	Prevents rust and warping in humid environments.
Fire Retardancy	Pass EN 1021-1	Cigarette test; required for public seating.EN 1021-1

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Side Rails Part
Form the side structural members of the frame, providing lateral support

Material: Hardwood or Steel
Cross Supports Part
Horizontal members that provide internal support and prevent sagging

Material: Plywood or Engineered Wood
Corner Braces Part
Reinforce frame corners for increased structural integrity

Material: Steel or Hardwood
Connection Points Part
Precision-engineered attachment points for modular connection to other frames

Material: Steel or Reinforced Plastic

Manufacturers of Seating Module Frame

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What materials are commonly used for seating module frames?

Common materials include hardwood, plywood, engineered wood, and steel tubing. Each material offers different properties in terms of weight, strength, and cost. The choice depends on the intended application and load requirements.

What is the typical load capacity of a seating module frame?

The static load capacity per seat is typically in the range of 150–250 kg, as referenced in EN 12520. For commercial use, higher capacities may be required, so it is important to verify the specific model's rating with the manufacturer.

How does the frame's dimensional tolerance affect assembly?

Dimensional tolerance, typically ±2 mm per ISO 2768-m, ensures that modules align correctly when connected. This is crucial for the stability and appearance of the assembled sofa system.

What standards are relevant for fire retardancy and corrosion resistance?

Fire retardancy is referenced to EN 1021-1, which is a cigarette test. Corrosion resistance is verified through salt spray testing per ISO 9227, with surface treatments like epoxy coatings of 60–120 μm. Always confirm compliance with the supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Static load capacity: 150-250 kg per module
other spec:	Maximum deflection: ≤5 mm under rated load
temperature:	Indoor ambient: 10°C to 40°C

Seating Module Frame

Product Specifications

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Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

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