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OM Seating  |  SKU: EV78

Office Master Electrostatic Discharge ESD High Back Ergonomic Chair (Vinyl) | EV78

$746.85

The Office Master EV78 is an ESD high-back ergonomic chair designed for static-sensitive workspaces. It features a tall back, full ergonomic controls, and a seat height range of 17"–22" to support comfort during long sessions, with a 300 lb weight capacity.

Highlights

  • ESD-safe materials: fabrics crafted from 99% nylon and 1% carbon fiber, plus available ESD vinyl finishes, to help dissipate static in sensitive environments.
  • High-back support: tall backrest paired with a multi-function mechanism for personalized comfort across long workdays.
  • Seat height range: 17"–22" to accommodate a wide range of body types and desk heights.
  • Weight capacity: supports up to 300 lbs for durability and reliability.
  • Customization options: 7 ESD fabric colors and 2 ESD vinyl colors to match your workspace aesthetic.
  • Design lineage: based on the Office Master PT78 platform, this is the ESD version of that trusted chair.
  • Ideal use cases: electronics assembly, testing, repair work, lab environments, and other static-sensitive tasks.

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Dimensions

Model/Sku Office Master EV78
Overall Width 27"
Overall Height 40-48"
Back 19.5"w x 22"h
Seat 21"w x 18-21.1"d
Seat Height 17-22"
Chair measurements are approximate and are based on switching cylinder heights on otherwise the same chair, with the same base and casters. Arm dimensions are approximate as actual measurements will vary depending on a variety of factors: cushion contour(s), seat upholstery, memory foam, etc.

Downloads

Warranty

Office Master, Inc. (OM) warrants to the original purchaser that its products are free from defects in materials and workmanship for the applicable warranty period, as indicated below. 

Should any item fail, OM will – at its sole discretion – repair or replace, with a comparable product or part, any item found to be defective as a result of normal commercial use (i.e., a single 8-hour shift, 5 days per week).

This warranty does not apply to items subjected to abuse, misuse, neglect, alteration, or damage caused by shipment, storage, accident, fire, flood, or act of God.

Note: the actual warranty terms are specified on the chair product page. 

lifetime limited warranty:

The OM5 Series® (including the OM5 Active sub-series), Truly.® Series, and Ginny are covered by a lifetime limited warranty on all structural components as defined below.

12-year limited warranty:

Unless otherwise specified, all models not classified as budget or 24/7 or heavy-duty are covered under a 12-year limited warranty on all structural components as defined below.

7-year limited warranty:

Unless otherwise specified, all models classified as budget or 24/7 or heavy-duty or bariatric are covered under a 7-year limited warranty on all structural components as defined below. Budget series include: BC, SG, ST, and WS. Bariatric series includes: GY4B-26 and GY4B-30.

warranty terms:

Within a given model’s applicable warranty period, all structural components, including gas cylinders, wood, metal and plastic parts (i.e., chair frames, bases and control handles) are guaranteed against structural failure when under normal commercial use. All OM seating comes with a default 275 lbs. weight capacity limit unless otherwise specified by OM. 

For all models, consumable items (i.e., casters, glides, etc.) are covered by a 5-year normal commercial use warranty.

fabrics and foam:

OM in-stock upholstery & foam cushions are covered by a 5-year normal commercial use warranty. Normal wear and tear on fabrics such as wrinkling, dirt accumulation or gathering is not covered. This includes Truly.® Series “Jackets” and “Wraps”. Natural, minor variations may exist in color, surface, grain or texture of upholstery materials. As a result, any such variations are not warranted. COM/COL and graded-in fabrics are not covered.

warranty labor:

This warranty exclusively covers the repair or replacement of OM parts as determined by OM and does NOT cover any portion of field labor or service and does NOT cover any portion of field labor or service. For information regarding OM’s non-warranty shop time and related charges, please reference a current copy of OM’s pricebook, in the Terms and Conditions section.

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