A standard lightweight partition panel ships at 2.44 m long × 0.61 m wide, with stock thicknesses of 75 / 90 / 100 / 120 / 150 mm — dimensions confirmed by Inner-Mongolia-channel output of Tangshan Ruierfa, which holds annual output above 5 million panels [S3].
Boards use a calcium-silicate face shell with a cement + EPS-granule core, factory-cast on a flow line, then joined on site through matching male/female tenons, embedded steel anchors, and a thin mortar bed — the published joint geometry is "lift, apply mortar to the tenon, drop the next board, plumb" [S1]. Compared with masonry, the working weight per m² is lower, the fire rating is A1 (non-combustible) with a stated 1000 °C / ≥3 h endurance, and the wall is treated as a single assembly for seismic anchorage rather than as discrete blocks [S3].
Panel taxonomy by core material and what each one means on site
The Chinese market groups the product into six core families — GRC, ALC, FGC, gypsum, composite, and foam-cement sandwich — and that family choice drives both panel weight per square metre and the cutting/anchoring method on site [S1]. ALC (autoclaved lightweight aerated concrete) panels are the most common reference spec and are typically priced around 70 RMB/m², while GRC variants sit near 65 RMB/m²; the broad retail band for the whole category is 40-100 RMB/m² [S1]. A 75 mm foam-concrete sandwich panel from Yantai Saidy is documented as a non-load-bearing internal/external insulation board with anti-corrosion fibre reinforcement, intended for cut-and-fix workflows rather than wet laying [S2].
For spec-driven projects, the working weight per m² (typically 60-90 kg for a 100 mm composite board) matters more than headline price, because it sets the man-handling rule: two-person lift for ≤120 mm, mechanical assist for 150 mm and partitions above ~3 m height [S3]. GRC remains the default for general interior partitions; ALC is preferred where the wall must double as fire compartmentation; composite foam-cement is the choice when the wall also has to deliver a declared R-value for building-envelope compliance [S1][S2].
Substrate and layout prep — the step that decides whether the wall stays straight
Floor and soffit must be clean, dry, and within 3 mm/m of plane before the first panel is set; any deviation propagates into the tenon joint and shows as a 1-2 mm lip at every subsequent board-to-board interface [S1]. Mark the panel line on the floor and transfer it to the ceiling with a plumb laser, then pre-drill anchor points at 400-600 mm centres along the top and bottom tracks — this is what the manufacturer calls the "steel-structure anchoring method" for high or long partition runs [S3].
Sort panels by length before lifting: a 2.44 m board cannot be cut to compensate for an out-of-square room corner without exposing the calcium-silicate face shell, so the layout should start from the longest clear run and work back to the short returns. Cut openings for switch boxes, conduit, and through-pipes are made with a hole saw or handheld grinder after the panel is placed, not before — the factory edge is what keeps the tenon geometry intact for the next board's male-female engagement [S1]. A common install failure is to pre-cut all panels on the deck, then discover the wall line is short by 30-40 mm; the fix is to leave the final panel un-cut until the run is closed, then scribe and trim in place.
Joint bedding, anchoring, and the panel-by-panel sequence
The published joint procedure is: stand the first board plumb, brace to ceiling, apply a 3-5 mm bead of bedding mortar (or factory-supplied thin-set) to the vertical tenon of the next board, drop it onto the floor track, slide the tenon home, and tap flush with a rubber mallet — repeat without pause so the bedding mortar does not skin over [S1]. A structural anchor (typically an L-bracket or rebar dowel) is set into the floor track at every panel-to-panel vertical joint and tied back to the structure at the top; this is what delivers the seismic-grade, "wall acts as one plane" behaviour that the manufacturer quotes as several times the strength of a conventional brick partition of equal thickness [S3].
Horizontal reinforcement (a 6-8 mm rebar or a thin steel flat) is dropped into the slab-anchored channel at floor and ceiling level and bedded in non-shrink grout, not standard mortar — non-shrink grout is what stops the head joint from creeping under cyclic load. The wall is then left to cure for 24-48 hours before any tiling, plastering, or heavy fixture load is applied; finish trades must not drill into the panel within 72 hours of the final panel being set, because the bedding mortar has not reached design strength and the tenon interface is still dependent on friction plus the L-bracket.
Fire, acoustic, and moisture performance — what the spec sheet actually guarantees
Composite calcium-silicate / cement-EPS panels are rated A1 non-combustible per the manufacturer and survive 1000 °C exposure for at least 3 hours without releasing toxic gases or smoke — this is the headline fire claim and the reason the product is specified for kitchen and riser-shaft partitions in domestic work [S3]. The same construction gives a single-panel airborne sound reduction in the 35-42 dB range (Rw) for a 100 mm board, rising to ~45-50 dB when a 50 mm acoustic cavity is added on one face; values vary by core density, so the manufacturer test sheet must be checked against the actual board grade supplied, not the catalogue family name [S1].
Moisture behaviour is asymmetric: the cement-EPS core is dimensionally stable in normal interior humidity, but the calcium-silicate face will wick water if the panel is stored on a wet site, so boards must be kept on pallets under tarp until use. Panels that have been rain-soaked on site must be dried for 48-72 hours before installation, otherwise the bedding mortar will not bond to the tenon face and the vertical joint will hairline-crack within weeks. Direct water exposure (showers, wet kitchens) is outside the product scope — those zones need a cement board or a waterproofed render over the panel, not the bare calcium-silicate face [S3].
Comparison: GRC vs ALC vs composite foam-cement on four install-side criteria
On the four install-side criteria that actually drive site decision-making — panel weight per m², field-cut method, fire-rating claim, and reference price — the three most common core types line up as follows. GRC (glass-fibre-reinforced concrete) at 100 mm typically weighs 75-90 kg/m², cuts with a hand grinder, carries the standard A1 / 1000 °C ≥3 h claim, and lists near 65 RMB/m² [S1]. ALC at 100 mm is lighter (55-70 kg/m²), cuts cleanly with a hand saw, shares the A1 claim, and lists near 70 RMB/m² [S1]. Composite foam-cement sandwich at the same 100 mm is the lightest of the three (45-60 kg/m²), cuts with a wood-style handsaw, carries the same A1 / 1000 °C ≥3 h claim, and sits in the 50-80 RMB/m² band depending on facing [S2]. The differentiator in practice is field-cut method: ALC and composite are friendly to site carpentry, GRC requires a grinder and dust control, which is what pushes GRC into shop-prefab rather than on-site cut-and-fix workflows.
For total cost of ownership across a multi-year partition programme, the panel cost is only one lever — labour cycle time, finish trade interaction, and re-work rate usually dominate; that picture is broken out in the ALC panel total cost of ownership analysis.
Where lightweight partitions are the wrong product
Lightweight partition panels are wrong for any application that imposes a sustained point load above ~50 kg per fixing (wall-hung boilers, heavy sanitaryware, commercial kitchen hoods) unless the fixing is backed by a steel plate or a dedicated noggings frame set into the panel joint during install [S3]. They are also wrong for external curtain-wall spandrels that have to carry a weather-side air/water barrier — the calcium-silicate face is not a weathertight cladding on its own and the joint geometry is not designed for differential expansion cycles [S1].
Finally, do not use a single-skin lightweight panel as a fire-rated riser-shaft wall where the design relies on the partition alone for 2-hour FRR without a tested system listing — the A1 / 1000 °C ≥3 h figure cited by the manufacturer is a material property, not a system fire rating, and the specifier must request the assembly-level test certificate for the actual wall configuration (single panel, double panel, cavity, finish) before signing off [S3]. When in doubt on load, weather, or rated fire assemblies, escalate to a structural or fire engineer rather than relying on the panel's standalone claims.
Trackable signal: Yantai Saidy is one of the few named Chinese equipment vendors publishing a flow-line spec for composite foam-cement insulation board production, which means capacity additions in that line are a leading indicator of supply loosening for the 50-80 RMB/m² composite segment through the second half of 2026 [S2]. Cross-check: Tangshan Ruierfa (Inner Mongolia channel) reports annual output above 5 million panels and supplies test reports on request — request the same three reports (strength, flex, freeze-thaw) when qualifying any new vendor in this category [S3].
Detailed specification references: lightweight partition panel, linear guide, and crossed roller guide.