Texas Comptroller of Public Accounts

Texas Comptroller of Public Accounts, Glenn Hegar

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Texas Specification No. 425-06-12A

Effective Date: August 15, 1994

Reformatted Date: October 8, 1996




1. SCOPE: This specification establishes requirements for heavy duty multi-shift, ergonomic office chairs designed to provide comfortable seating under conditions of severe use.

2. APPLICABLE SPECIFICATIONS AND STANDARDS: Reference to specifications, standards, test methods, and other documents shall be to the issues in effect on the date of the Invitation for Bids. Copies of the referenced documents may be obtained from the issuing organizations at the addresses shown. The following publications form a part of this specification to the extent specified herein:


2.1.1. ANSI/BIFMA X5.1-85 -- General Purpose Office Chairs, Tests.

2.1.2. ANSI/HP-83 -- Hardwood and Decorative Plywood.

2.1.3. ANSI/HFS 100-88 -- Human Factors Engineering of Visual Display Terminal (VDT) Workstations.

2.1.4. ANSI Z34.2-87 -- Self Certification by Producer or Supplier.

2.2. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM), 1916 Race Street, Philadelphia, PA 19103:

2.2.1. ASTM D 3574 -- Method of Testing Flexible Cellular Materials: Slab, Bonded, and Molded Urethane Foams.

2.2.2. ASTM D 3770 -- Standard Specification for Flexible Cellular Materials: High Resilience Polyurethane Foam (HR).

2.2.3. ASTM D 3597 -- Performance Specification for Woven Upholstery Fabrics.


2.3.1. BIFMA X5.7-91 -- Upholstered Furniture Flammability Standard for Non-residential Non Live-in Occupancies.

2.4. FEDERAL SPECIFICATIONS, Superintendent of Documents, U.S.Government Printing Office, Washington, DC 20402:

2.4.1. A-A-2235 -- Chairs, Rotary, (Office, Ergonomic, Upholstered).

2.4.2. TT-C-490 -- Cleaning Methods for Ferrous Surfaces and Pretreatments for Organic Coatings.

2.4.3. FNEW-89-269E -- Performance Test Method for Intensive Use Chairs.


2.5.1. Technical Bulletin No. 117 -- Requirements, Test Procedure and Apparatus for Testing the Flame Retardance of Resilient Filing Materials used in Upholstered Furniture.

3. CLASSIFICATION: Chairs shall be classified by height and seat width as follows (See Table No. One):

3.1. Type:

3.1.1. Height "A": High-back, large size, with arms.

3.1.2. Height "B": Medium size, with arms.

3.1.3. Guest Chair: With or without arms, sled base or four legged (per manufacturer's standard construction) to match.

4. DEFINITIONS: Terminology used in this specification is intended to be generic in nature and consistent with meanings that have been defined through general use and/or accepted trade practices. Where variant meanings may exist, the applicable interpretation shall be determined by the Texas Procurement and Support Services (TPASS).

4.1. Commission: Texas Procurement and Support Services (TPASS).

4.2. Ergonomic Chair: A chair that, as a minimum, is designed to support the back in its natural curve, distribute the body's weight evenly, and minimize pressure on the thighs behind the knees. Adjustment mechanisms allow quick and easy adjustments to be made by the occupant. These adjustments may include a combination of seat height, seat pitch angle, back height, back upright tilt angle, back tilt tension, and adjustable arms. By changing one or more of these adjustments several times a day to allow for movement in the chair, user fatigue is lessened.

4.3. Intensive Use (Heavy Duty): Use which can be expected for a 40 hour to around-the-clock (multi-shift) work week. Severe use includes incidental bumps and scrapes which can occur while sitting in, swiveling, tilting or moving the chair in close proximity to desks, walls or other objects.

4.4. One Piece Shell: A unitary inner or outer shell.

4.5. Two Piece Shell: A separate seat and back.

5. REQUIREMENTS: Products furnished under this specification shall meet or exceed the following requirements:

5.1. General Requirements:

5.1.1. All chairs shall be new, unused, and a currently standard product of an established manufacturer except for such deviations as may be required by this specification.

5.1.2. chairs shall present a neat, well finished appearance and shall be free of all imperfections and/or defects which might affect appearance, normal life, safety or serviceability.

5.1.3. Chairs shall have a wide range of adjustments as specified. Tools shall not be required.

5.1.4. Body weight shall be raised in order to raise seat height when the chair has a pneumatic height adjustment.

5.1.5. Chairs other than guest chairs shall provide full 360 ° swivel operation.

5.1.6. Chairs with adjusting back and seat heights shall be furnished with a locking mechanism.

5.1.7. Chairs with tilting backs and/or seats shall be provided with tilt angle controls and locking mechanism.

5.1.8. Backrest shall be contoured for comfort and body support, and provide lumbar support.

5.1.9. Seat shells shall be contoured (compound curve), shall be designed for maximum posterior support and shall have rolled edges.

5.1.10. The upholstery shall be properly tailored and free from wrinkles, rolls, sags or other defects in appearance. Seams shall be straight, and free of broken threads and loose ends. The upholstery shall be attached to the chair in a manner that is free of hazards and designed to prevent slippage and excessive wear. All raw edges shall be completely concealed.

5.1.11. All exposed metal surfaces shall be corrosion resistant.

5.1.12. Bolts and screws, or other fastening devices shall be adequate to maintain the chairs structural integrity and to meet the specified warranty period. Fasteners securing the back and seat to the shell, and the arms to the shell, shall not loosen under multi-shift use.

5.1.13. All chairs shall be designed for intensive use. Chairs shall function normally for individuals up to 300 lbs.

5.1.14. Details not specified herein shall be in accordance with standard commercial practices for products of this type.

5.2. Colors: The colors of the chair finish and upholstery shall be selected form the manufacturer's standard colors, or as specified in the Invitation for Bids.

5.3. Dimensions: Dimensions shall be shown in Table No. One (1). See Attachment No. Two (2) for methodology. Manufacturer shall offer two distinct sizes.



Size Overall


Fig. 1A

Seat Width Fig. 1B Seat Height Fig. 2A Seat Width Fig. 2B Seat Depth Fig. 2A Back Width Fig. 3B Back Height Fig. 3A Base Span 23
A 32-48 24-28 18-24 19-25 18-21 18-24 19-26 23-28
B 31-44 24-26 16.5-21 18-22 18-20 16-20 15-20 23-27
  1. Measurements are made with seat and back in lowest position, with casters.
  1. With arms.

5.4. Ergonomic Features:

5.4.1. All chairs shall conform to the applicable seating requirements of Section 8 of ANSI/HFS 100. Also see Table No. One.

5.4.2. Chairs shall be designed for various postures of most users, and enhance work posture and comfort when tested.

5.4.3. Chair shall allow freedom of movement and reduce the amount of strain on the spine.

5.4.4. Chair adjustment controls shall be convenient and shall not release or change after being set. Controls shall not pose a safety problem during activation.

5.4.5. Armrest shall not interfere with proper work posture. Armrest shall allow for lateral thigh movement.

5.4.6. The minimum range of adjustment for seat height shall be 16.0" -- 20.5" for size "B".

5.4.7. Chairs shall have contoured seats and backs with HR foam lumbar reinforcements.

5.4.8. Seat depth shall permit contact with the seat back in the lumbar area.

5.4.9. Seats shall be designed to avoid pressure on the lower leg, and have a front edge relief design such as a "waterfall contour".

5.4.10. The minimum seat depth shall be 15".

5.4.11. The minimum seat width shall be 18", measured at the spindle (or geometric) center of the seat.

5.4.12. The minimum back width shall be 12" in the lumbar region.

5.4.13. The minimum backrest height shall be 15" (back cushion): Figure 3A, Attachment No. Two.

5.4.14. Chairs shall have a backrest which: Has sufficient contour to provide adequate support for the operator's lumbar and middle back area. Has lumbar support that is concave in the horizontal direction, convex in the vertical direction, sufficient to preserve appropriate curvature of the lower back when the operator is seated with the operator's back resting against the back of the chair. Includes a middle back support area that extends upward from the seat approximately 13".

5.4.15. The back tapered shape shall support the spine at L3 and L5 vertebra, and shall do so without restricting arm and upper body movement.

5.4.16. The minimum inside distance between armrest shall be 18" for size "B" , 20" for size "A".

5.4.17. All chairs (except side) shall be provided with casters.

5.4.18. Caster spread shall be equal to or greater than overall seat width.

5.5. Design Requirements:

5.5.1. Base: Metal base shall be a swivel five or six leg "star" design, high strength heavy duty steel weldment with welded steel reinforcement beneath the central hub or heavy duty cast aluminum alloy. Arm steel tubing shall be minimum 16 gauge. It shall surpass ANSI/BIFMA X5.1 for load (Paragraph 8) by a minimum factor of 1.2 (3,000 lbs), or pass FNEW 83-269E.

The base shall be free of sharp edges or protrusions and be equipped with dual wheel casters.

Metallic surfaces shall be scuff resistant. The color shall be monochromatic to match arm color. See Paragraph 5.7. At the manufacturer's option, the base may be furnished in a polished aluminum finish rather than a powder finish.

Alternately, the entire base amy be injection molded, color impregnated, glass reinforced polyamide thermoplastic resin (nylon) with a minimum static load capacity of 3,000 lbs.

5.5.2. Base Column: Chairs shall be available with the height adjustment pneumatic cylinder. The cylinder shall be equipped with a heavy duty shock absorber, minimum 7 mil (polyurethane or rubber ring in base of cylinder assembly or heavy duty compression spring in the base tube) to cushion impact with the seat in the lowest height position. Color shall match the shell.

5.5.3. Chassis, Control and Pneumatic Cylinder: The parts shall be assembled by bolts or welding, and shall be designed to give a rigid and properly balanced support between the chair frame and the base at all times.

5.5.4. Casters: 360 ° swivel wheels of hard plastic dual wheel design, minimum 2" diameter, shall have a snap-in stem for easy removal, or shall be the replaceable stem and socket type and not be easily separated from the base. All casters shall comply with Paragraph 18.3(1) of ANSI/BIFMA X5.1.

5.5.5. Chair Controls: All chairs shall have seat height adjustment, tilt lock, and for two piece chairs, an independently adjustable back angle. The control iron shall be extra heavy duty, with reinforcement. The control shall allow for static posture settings (variable set angles) or allow the back to have the capability to be stopped from tilting further in any position within the inclination range. Front tilt is optional.

5.5.6. Seats and Backs: Foam cushions shall be glued or injection molded to a molded contoured thermoplastic, stamped steel, or plywood base. Seat padding shall be minimum 2.25" thick (See Paragraph 5.6.2.).

Chairs shall have field (on-site) replaceable cushions.

All back cushion assemblies shall support the lumbar area.

Upholstered back and seat assemblies shall be firmly secured to the outer shell. Upholstery shall be bonded to foam in the contoured area of the chairs.

5.5.7. Back Support: The back support shall be die formed steel, minimum 1/4" thick, for mounting under rear of seat and center of back. The epoxy powder finish shall match the color of the base and arms.

5.5.8. Arms: Arms shall consist of cast aluminum or steel which is coated with resilient urethane, electrostatically applied high build epoxy coating or coated with a vinyl with color impregnated throughout, or a plastisol, or a steel core assembly coated with resilient urethane or vinyl with color impregnated throughout, or integral colored, textured, glass reinforced polyester or injection molded polyamide with molded in steel attachment brackets.

Material type shall not cause damage to worksurfaces. Outer vinyl or urethane surfaces shall have a uniform finish with no exposed seams on the user side. Arm color shall match shell color.

Arm style (slanted loop or "D" or "T") shall provide adequate elbow rest.

Arm shall be easily installed or removed in the filed (on-site).

Fasteners for the arms shall be hidden from view when the chair is in a normal upright position.

If so specified in the Invitation for Bids, chairs shall be available with adjustable arms. The height range adjustment shall be minimum 2".

5.5.9. Arm Pads: Arm pads shall be cantilever or "T" shape, with plastic or rubberized or molded flexible vinyl caps over polyurethane foam or textured resilient thermoplastic or injection molded glass filled nylon with a vinyl coating, or self skinning urethane foam over cast aluminum or steel arms.

5.5.10. Seat Shell: Seat board shall be contour shaped, minimum 8 ply plywood, minimum 1/2" thick, per ANSI/HP or minimum 16 gauge steel or ABS plastic. Edges shall be rounded or sanded or covered to prevent cutting of fabric. Metal T-nut or threaded inserts shall be required for connection of arms, back support and chair control.

5.5.11. Back Inner Shell: Back board shall be contour shaped, minimum 6 ply plywood, minimum 1/2" thick, per ANSI/HP or minimum 20 gauge steel or ABS plastic. Edges shall be rounded and sanded to prevent cutting of fabric. Metal T-nut or threaded inserts shall be required for connection of arms and back support.

5.5.12. Mechanism/Controls: All control components for back and seat inclination and seat height adjustments shall be mounted in a heavy duty steel or cast aluminum alloy assembly. There shall be no design characteristics for mechanical castings or components that will negatively affect appearance, serviceability or that could cause personal injury or damage to clothing. Control mechanism and seat support shall be enclosed. Seat inclination (angle) shall respond to body movement in a rear tilting motion with the back tilting motion. Articulated movement between the seat and backrest is acceptable. The seat shall be lockable in any position within the inclination rage or be stopped from tilting further by utilizing a control or lever on the underside of the seat. Back reclination shall be easily changeable providing approximately 17 ° -- 20 ° back angle change.

Back inclination (angle) shall respond to body movement in a rear tilting motion. The back shall be lockable in any position within the inclination range or the back shall be stopped from tilting further by utilizing a control device on the underside of the seat. Free float action may also be provided for. The tension on the back tilt of the chair shall be adjustable with a knob (located under the seat pan near the front of the chair mechanism) connected to torsional coil springs by means of an adjustment nut. Seat height shall be adjustable and available with a pneumatic adjustment which utilizes a single button or lever located on the underside of the seat. The height adjustment rand shall be minimum 4-1/2" (See Table No. One). The pneumatic seat height shall be locked in any position within the height adjustment range. The back cushion assembly height adjustment (if two piece design) shall lock in multiple positions within the range. The height adjustment range shall be minimum of 2". All adjustment to seat and back shall be capable of being made while seated. Outer Shell: Chairs shall have a unitary one piece or two piece, molded high impact, color impregnated, thermoplastic outer shell on the seat and back or minimum 3 ply plywood, minimum 7/32" thick, per ANSI/HP or minimum 20 gauge steel. It shall be shaped and attached with concealed fasteners.

5.5.13. Swivel: The chairs shall swivel with continuous seat rotation.

5.6. Materials: The materials used in the construction of the chairs shall conform to the requirements stated herein.

5.6.1. Metal Parts: Metal seams and joints shall be completely welded or brazed fro maximum strength at each joint. All parts shall be properly aligned, and all welds shall be sound, without porosity and smoothly finished.

5.6.2. Padding Material: The seat and back cushions shall consists of polyurethane foam and shall be secured by connecting to the inner shells to prevent slippage. The foam shall be flame retardant according to California Bulletin #117.

The seat padding shall be minimum of 2.25" thick, 2.4 lb/ft3 density; back padding shall be minimum 1.5" thick, 1.8 lb/ft3 density; the foam shall be high grade, high resilience, polyurethane, Grade HR according to ASTM D 770.

Padding shall consist of one of the following: Multi-layer, multi-density foam, or; Multi-layers of sculptured foam, or; Multi-density, contoured sculptured foam, or; Contoured, injection molded foam, or; Padding with molded-in wire that snaps into the shell, or; Foam glued to an injection molded polypropylene back ring and seat ring assembly that snaps to the chair inner shell and is held in place with posts and snaps.

5.6.3. Nylon Upholstery Material: One-hundred percent (100%) nylon shall be provided as the standard selection for the chairs. The material shall be abrasion resistant, and pass 30,000 cycles without any noticeable wear (ASTM D 3597), and shall be flame retardant and stain resistant with a minimum weight of 14 ounces per linear yard.

The nylon shall be glued to the foam cushion in all recessed and high contact areas.

5.6.4. Olefin Upholstery Material: When so specified in the Invitation for Bids, one-hundred percent (100%) "Marquesa Lana" or equivalent olefin fabric shall be provided. The fabric shall be minimum weight of 18 ounces per linear yard, abrasion resistant, (ASTM D 3597), and shall be flame retardant and stain resistant.

The olefin shall be glued to the foam cushion in all high contact areas.

5.6.5. Bumper: when so specified in the Invitation for Bids, the outer perimeter of the back cushion shall be provided with a flexible vinyl or plastic protective bumper to prevent scarring or tearing of upholstery.

5.7. Finish:

5.7.1. Base Coating: A thermo-set, epoxy resin dry powder coating, electrostatically applied, shall be available for all chairs. There shall be no indication of rust or decay unde the coating. As an alternate, the base may be covered with a protective polyplastic cap constructed in a manner that will prevent scratching. The finish shall not crack or split under severe usage and shall have a high abrasion resistance.

All surfaces shall be thoroughly cleaned and free of dirt, oil, grease, moisture or other foreign material prior to finish, and shall show no evidence of chipping. The cleaning and priming of steel surfaces shall conform to one of the methods of Federal Specification TT-C-490, at the manufacturer's option.

A polished aluminum finish may be substituted, or chairs may be furnished with polished chrome foot plates.

5.8. Flammability Requirements: Finished chars and component materials shall meet or exceed the flammability requirements of BIFMA X5.7 and California Technical Bulletin #117.

5.9. Options: When so specified in the Invitation for Bids, chairs shall be furnished with the following options:

5.9.1. Casters: Casters with locks for use on tile (hard floor) shall be available.

5.9.2. Arms: Adjustable "T-style".

5.9.3. No Arms.

5.9.4. Upholstery: See Paragraph 5.6.4.

5.9.5. Bumper: See Paragraph 5.6.5.

5.10. Color Charts: Bidders shall be responsible for furnishing to each using agency a color chart showing the manufacturer's standard colors and finishes.

6. TESTING: Testing shall be done by, or at the direction of, the Commission and/or the receiving State agency. Tests shall be performed on products from shipments to ordering agencies. In the event products tested fail to meet or exceed al conditions and requirements of this specification, the cost of the samples used and the cost of testing shall be borne by the supplier.

6.1. Tests: The products furnished under this specification shall be tested by the following methods or approved equally applicable procedures:

6.1.1. ANSI/BFMA X5.1.

6.1.2. Casters: Perform the soft tread caster test on all chairs. Disregard the hard tread caster test. See Paragraph 5.5.4.

6.2. Certification: The vendor shall submit laboratory test results from the manufacturer to the Commission with the bid. See Attachment One (1).

7. SAMPLES: Unless otherwise specified in the Invitation for Bids, no pre-purchase samples shall be required. Samples tested shall be obtained from products supplied on regular orders.

8. INSPECTION Products furnished under this specification shall be inspected by, or at the direction of, the Commission and/or the ordering State agency either at the destination or place of manufacture.

9. WARRANTY: All chairs shall carry the manufacturer's standard warranty and shall be guaranteed against defects in materials, workmanship and performance for a minimum of five (5) years, multi-shift use. This warranty shall be inclusive, i.e. foam, fabric, pneumatic piston, base and casters. The warranty shall begin on the date of acceptance of the unit by the ordering agency. During this warranty period, the vendor shall repair or replace defective components and/or units at no cost to the State of Texas.

9.1. Guarantee: The vendor shall guarantee that the chairs will be a standard and continuing item in the manufacturer's product line. The chairs shall be identifiable by regular catalogue numbers.

10. AVAILABILITY OF SERVICE: Factory authorized service shall be available within the State of Texas.

10.1. Service: When so specified in the Invitation for Bid, the bidder shall submit a current list of companies or individuals and their addresses, who can perform service on the products furnished.

10.2. Parts: An adequate supply of repair parts shall be carried in stock within the State of Texas for the expected life of all products furnished under this specification, or factory response time shall be timely and satisfactory if out-of-state.

11. INSTRUCTION BOOKS AND/OR MANUALS: The vendor shall furnish one (1) copy of any required operating and/or maintenance instruction for each chair delivered. The instructions shall accompany the chair when shipped.

12. PACKING AND/OR PACKAGING: Packaging for shipment shall be in accordance with the manufacturer's standard practice and in a manner readily accepted by common carrier engaged in interstate commerce. Within the shipping carton, units shall be packed in a manner designed to minimize damage during shipment due to rough or improper handling.

12.1. Delivery: When so specified in the Invitation for Bids, delivery shall be as follows:

12.1.1. Agency receiving dock.

12.1.2. Inside delivery, non-installed.


13.1. Marking: Each shipping container shall be clearly marked with:

13.1.1. Name of contents.

13.1.2. Quantity.

13.1.3. Name of the manufacturer.

The container or shipping documents shall include:

13.1.4. Order number or contract number.

13.1.5. Name and address of ordering agency.

13.1.6. Agency requisition number.

13.2. Labeling: Each chair shall bear a securely affixed and durable label showing the following:

13.2.1. Manufacturer's name or;

13.2.2. Manufacturer's trademark.

14. BID LITERATURE: All bids shall be accompanied by a description of the products being offered.

15. COMPLIANCE: In order for consideration to be given to the bid on an item under this specification, the bidder must comply with the following conditions:

15.1. Equipment Identification: The make, model number, name of manufacturer, brand or trade name, etc., as applicable, of the item which the vendor proposes to furnish must be stated as part of the bid.

15.2. Exceptions: Notwithstanding the above, any exception taken by the bidder to the requirements and conditions of this specification must be stated and described in detail as a part of the bid. If no exceptions or deviations are identified in this manner, the items must be furnished exactly as described herein.

15.3. Proof: The bidder shall bear the burden of proof of compliance with this specification.

15.4. Certification: When so specified in the Invitation for Bids, bidders shall provide testing lab certification from the manufacturer that the chairs meet the requirements of ANSI/BIFMA X5.1. See Attachment One (1).

16. REFERENCED MANUFACTURERS: The following manufacturers are listed for reference purposes only. Such references are not meant to be restrictive. Listing does not relieve the manufacturer and/or vendor from meeting each requirement of this specification.

16.1. Allseating: Chiroform 9800.

16.2. Bodybilt: J, K Series

16.3. Charroz: Sycroline 1300, 1839

16.4. Eck Adams: Tuff One

16.5. Gibo/Kodama: Series 4000, 8200

16.6. Miller: Synchros

16.7. Sitmatic: Series 16

17. ORDERING DATA: When ordering products conforming to this specification, the requisitioning agency shall specify the following:

17.1. The number of this specification (425-06-12A).

17.2. Color (See Paragraph 5.2.).

17.3. Options (See Paragraph 5.9.).

17.4. Type of delivery desired (See Paragraph 12.1.).

17.5. Quantity of each color required.

18. AVAILABILITY OF SPECIFICATIONS: Copies of this specification may be obtained by calling or writing:

Bid Services

Texas Procurement and Support Services

P.O. Box 13186

Austin, TX 78711-3047

(512) 463-3416




To: Purchaser "N"

Texas Procurement and Support Services

P. O. Box 13186

Austin, TX 78711-3047


By my signature below, I hereby certify:

1. that I an officer of my company and am authorized to make this certification;

2. that the information contained herein is true and correct and is provided in accordance with ANSI standard Z 34.2: Self Certification by Producer or Supplier;

3. that records verifying the information contained herein will be made available, upon request, to the Texas Procurement and Support Services of the State of Texas in accordance with the provisions of ANSI Standard Z34.2;

4. that this certification is for the following product manufactured by my company:

Model No: _______________ Description: _______________

5. that the product identified above meets or exceeds all requirements of the following Texas Specification No. 425-06-12A Chairs, Office, Severe Use;

6. that the product identified above meets or exceeds all applicable requirements of the following documents as determined by our own testing program or the test results of an independent testing laboratory.

Document Most Recent Test Data Testing Organization
ANSI X5.1 Test for General Office Chairs
  1. Submit test data.

Signed: _________________________________________

Title: __________________________________________

Company: __________________________________________

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