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Trade terms for professionals and design studios
Sedus — maker of the se:vision desk — publishes a number that most chair makers keep to themselves: se:mission has been tested for fifteen years against the company's own quality standards. Not fifteen years on the market — the chair is new — but fifteen years of simulated life before the product reaches a price list. For a specifier that figure answers the only question a boardroom chair really raises: what does it look like at the end of the lease, not on the day it arrives.
Everything else on the data sheet reads the same way. One moulding in glass-fibre reinforced recycled polypropylene holds seat, backrest and armrests together; pocket springs sit in the seat; the DuoMotion mechanism opens to 21 degrees and can be locked upright on request. Three backrest heights — 560 mm (22 in), 710 mm (28 in) and 860 mm (33 7/8 in), codes MI-201 to MI-203 — sit on two bases: four aluminium arms on glides for meeting rooms, visitor and waiting seating, five arms on castors when the chair becomes a management workstation. Seat elevation runs from a fixed central suspension to a gas cartridge or a return mechanism. La Mercanti specifies the chair line by line for British projects, because every surface on it is upholstered separately.
Collection: se:mission, Sedus
Manufacturer: Sedus Stoll AG, Dogern, Germany
Design: Volker Eysing
Type: fully upholstered conference swivel chair
Backrest versions: MI-201 low back (560 mm / 22 in) · MI-202 mid back (710 mm / 28 in) · MI-203 high back (860 mm / 33 7/8 in)
Base versions: four-star aluminium base on glides, plastic or felt — meeting, visitor and waiting seating · five-star aluminium base on hard, soft or design castors — management workstation
Seat elevation: fixed-height central suspension · gas cartridge with damping (SHS type SG, EN 16955 class 4, mechanical damping) · automatic seat return at a fixed height of 440 mm (17 3/8 in), four-star base only
Mechanism: DuoMotion, tilting mechanism working with a flexible backrest in an asynchronous sequence; lockable or non-lockable (four-star base); cover always black
Angles: 21° opening, 21° backrest tilt, seat surface 2°/-14°, seat angle 95°
Backrest lock: upright, on request
Shell: seat, backrest and armrests in one piece; recycled polypropylene (inner) reinforced with glass fibre; moulded polyurethane foam; 10 mm (3/8 in) synthetic wadding; full upholstery
Seat: pocket-spring core, rounded front edge, integrated lumbar support
Side panels: glass-fibre reinforced polypropylene · wood with 3D natural veneer and clear lacquer (natural oak, anthracite oak, natural walnut) · fabric-covered insert
Upholstery: all Sedus fabrics, leather and faux leather; seat cushion, inner and outer backrest and panels specified separately; colour combinations within one collection; leather and faux leather combine with each other and with every fabric collection
Flame-retardant version: available with Umber or Step fabrics
Base colours: black, pure white, fjord green, cayenne red, sand beige, deep green, dark bronze, polished
Width: 670 mm (26 3/8 in) on the four-star base · 690 mm (27 1/8 in) on the five-star base
Seat height: 420-510 mm (16 1/2-20 in)
Overall height: 600-720 / 600-810 / 600-840 mm (23 5/8-28 3/8 / 23 5/8-31 7/8 / 23 5/8-33 1/8 in) on glides · 720-840 / 720-930 / 720-960 mm (28 3/8-33 1/8 / 28 3/8-36 5/8 / 28 3/8-37 3/4 in) on castors
User weight: recommended up to 130 kg (287 lb)
Recycled content: 100% post-consumer recycled material in the non-visible plastic parts
Delivery: carton packaging, chair fully assembled
In-house testing: tested for 15 years to Sedus quality standards
Certificates: GS mark from TÜV Rheinland LGA Products (DIN 4573, DIN EN 16139, verified to 130 kg / 287 lb) · TÜV Rheinland tested for harmful substances · GREENGUARD (UL 2818)
Award: iF Design Award 2025
Warranty: 5 years, declared by Sedus
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The four-star aluminium base on glides is the meeting, visitor and waiting version; the five-star base on castors is the one Sedus shows at management workstations. Both carry the same shell and the same three backrests.
TÜV Rheinland LGA Products issued the GS certificate for the se:mission conference swivel chair series to DIN 4573 and DIN EN 16139, with every test carried out up to a user weight of 130 kg (287 lb).
Yes. The seat cushion, the inner backrest, the outer backrest and the side panels are specified separately, which is how a company colour can be carried on the outside of a chair while the seat stays neutral.
Hard castors for soft floors, soft castors for hard floors, design castors on request, and on the four-star base plastic or felt glides. The choice is made per floor, not per chair.
670 mm (26 3/8 in) on the four-star base and 690 mm (27 1/8 in) on the five-star base, with a seat height of 420-510 mm (16 1/2-20 in). Those are the two numbers a table layout needs.
Five lines to take from the Sedus data sheet, in the order in which they decide the schedule.
MI-201, MI-202 or MI-203 sets the height of the backrest at 560, 710 or 860 mm; everything else in the schedule follows from that line.
A four-star base on glides can take a fixed seat height or a return mechanism; a five-star base on castors takes the gas cartridge. Writing one without the other leaves the line open.
DIN EN 16139 under the GS mark, with the certificate number and the 130 kg / 287 lb user limit printed on it, is a line a client can check; «contract grade» is not.
The seat cushion, the inside of the backrest, its outer face and the side panels each take a reference of their own — and the panel may leave the fabric list altogether, in wood or plastic.
The upright backrest lock is an on-request item on se:mission: it belongs in the schedule as a line, not as an assumption.
