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Trade terms for professionals and design studios
American specifications usually ask a chair two questions: who tested it, and to what weight. se:mission answers both on one certificate. TÜV Rheinland LGA Products issued the GS mark for the whole conference swivel chair series under DIN 4573 and DIN EN 16139, the European standard for non-domestic seating, and states that every test was carried out up to a user weight of 287 pounds — 130 kg. The gas cartridge is separately rated: SHS type SG, EN 16955 class 4, with mechanical damping.
The chair behind those papers is a Sedus conference seat upholstered on every face, drawn by Volker Eysing. One molding of recycled polypropylene, reinforced with glass fiber, forms seat, backrest and armrests; pocket springs sit under the seat foam; the DuoMotion mechanism runs a tilting action and a flexible backrest together. Backrests come in three heights — 22 in, 28 in and 33 7/8 in, codes MI-201 through MI-203 — and bases in two: aluminum with four arms on glides for conference, guest and waiting seating, aluminum with five arms on casters at an executive workstation, with fixed, gas-lift or self-returning seat elevation. On a US order La Mercanti writes the chair the way it will be built: backrest code, base, elevation, four covers. Five lines, no adjectives.
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 (22 in) · MI-202 mid back (28 in) · MI-203 high back (33 7/8 in)
Base versions: four-star aluminum base on glides, plastic or felt — conference, guest and waiting seating · five-star aluminum base on hard, soft or design casters — executive workstation
Seat elevation: fixed-height central suspension · gas cartridge with damping (SHS type SG, EN 16955 class 4) · automatic seat return at a fixed 17 3/8 in height, four-star base only
Mechanism: DuoMotion, tilting mechanism and 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 fiber; molded polyurethane foam; 3/8 in synthetic wadding; full upholstery
Seat: pocket-spring core, rounded front edge, integrated lumbar support
Side panels: glass-fiber 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 backrest, outer backrest and panels specified separately
Flame-retardant version: available with Umber or Step fabrics
Base colors: black, pure white, fjord green, cayenne red, sand beige, deep green, dark bronze, polished
Width: 26 3/8 in (four-star base) · 27 1/8 in (five-star base)
Seat height: 16 1/2-20 in
Overall height: 23 5/8-28 3/8 / 23 5/8-31 7/8 / 23 5/8-33 1/8 in on glides · 28 3/8-33 1/8 / 28 3/8-36 5/8 / 28 3/8-37 3/4 in on casters
User weight: recommended up to 287 lb (130 kg)
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, tested to 287 lb / 130 kg) · TÜV Rheinland tested for harmful substances · GREENGUARD under UL 2818, with emissions modeled to ANSI/BIFMA M7.1 and X7.1
Award: iF Design Award 2025
Warranty: 5 years, declared by Sedus
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Sedus recommends se:mission up to 287 lb (130 kg), and the GS certificate records that every DIN EN 16139 and DIN 4573 test was carried out at that weight rather than at a lower figure.
It holds GREENGUARD certification under UL 2818. Seating is modeled in a room with a ventilation rate of 24.8 m³ per hour and tested to ANSI/BIFMA M7.1, with compliance to X7.1 and to ANSI/BIFMA e3-2019 credit 7.6.1.
Yes: it ships in carton packaging, fully assembled. Nothing is put together on site, which is what makes a delivery into an occupied floor straightforward.
Leather and faux leather combine with each other and with every fabric collection. Two different fabric collections cannot be combined on the same chair; colors inside one collection can.
26 3/8 in across on glides, 27 1/8 in on casters, and the seat sits between 16 1/2 and 20 in. Overall height follows whichever backrest is ordered.
Five steps from the four upholstered surfaces to a purchase order that cannot be misread.
Seat cushion, inner backrest, outer backrest, side panels: se:mission takes a separate reference for each, so a single fabric name is never a complete order.
The side panel can leave the fabric list altogether: reinforced polypropylene, natural or anthracite oak, natural walnut, or a covered insert.
Leather and faux leather mix with anything; two fabric collections do not mix. Knowing that first saves a round of samples.
It exists with Umber or Step fabrics only, so it is specified as a version and not as a note at the end of the order.
Each surface carries its own reference; writing the code beside the fabric name is what keeps the outer backrest from arriving in the color of the seat.
