Large Occupant Office Chairs

BIFMA x5.11 - Furniture Testing - Large Occupant Office Chairs Micom offers BIFMA X5.11 testing as part of its Office Furniture Testing services.  ANSI/ BIFMA X5.11 General Purpose Large Occupant Office Chairs – tests – was released on January 5, 2015.  This standard is for individuals having a corporal mass greater than 253 lbs and up to 400 lbs which equates to the 99,5th percentile male in the US. Below is a test-by-test comparison between  X5.11 and X5.1 which is for individuals weighing up to 253 lbs (95th percentile male). To a large extent, the two standards are similar.  However, most of the loads and forces were increased.

New BIFMA Chair Standard for Large Occupants

Comparison Between BIFMA X5.11-2015 and ANSI/BIFMA X5.1-2011

Section # in X 5.11-2015BIFMA X 5.11-2015BIFMA X 5.1-2011Comments
TitleGeneral Purpose Large Occupant Office Chairs – TestsGeneral Purpose Office Chairs – tests
ScopeStandard based on a 400 lbs individualStandard based on a 253 lbs individualThis is not a bariatric chair standard hence; chairs tested to that standard cannot be qualified as “bariatric”.400 lbs represents the 99,5th percentile male. there is also a minimum seat width requirement for a “Large Occupant Chair” (refer to section 5 below)
4Type I, II, IIIType I, II, IIISame
5. Seat Width MeasurementsStandard allows use of CMD or a simple template given in section 5No such requirementExclusive to X 5.11
6. Back strength test (Type I)200/300 lbf(Test# 5) 200/300 lbfSame
7. Back strength test (Type II & III)150/250 lbf(Test# 6) 150/250 lbfSame
8. Drop test250 / 350 lbs225 / 300 lbsSame test, higher loads
9. Swivel cycling test400 lb load on seat250 lb load on seatSame test, higher load on seat
10. Tilt mechanism test350 lbs on seat225 lbs on seatSame test, higher load on seat
11.2. Seating impact testBag of 200 lbsBag of 125 lbsSame test, high load in bag
11.4. Front Corner Load Ease Test – Cyclic300 lbf on a 10″ diameter loading device165 lb fon a 8″ diameter loading deviceSame test; increased load with increased diameter loading area
12.3. Rear Stability testType I & II chairs: 13 disks, Type III: 6 disksType I & II chairs: 13 disks, Type III: 6 disksSame disks and loads, X5.11 call to manually move backrest at tilt stop for tilting chairs
12.4. Front Stability175 lb stability load, 4.5 lbf horizontal pull force135 lb stability load, 4,5 lbf horizontal pull forceSame test, vertical load increased
13. Arm strength test – Vertical200/300 lbf169 / 253 lbfSame test, different force applications.(The X 5.11 force is the same requirement as X 5.1-2002)
14. Arm strength test – Horizontal100/150 lbf100/150 lbfSame
15. Backrest durability (Type 1)350 lbs on seat, 100 lbf on backrest225 lbs on seat, 100 lbf on backrestSame back pull forces; different loads on seats.
16. Backrest durability (Type 2 & 3)350 lbs on seat, 75 lbf on backrest225 lbs on seat, 75 lbf on backrestSame back pull forces; different loads on seats.
17. Caster/chair base durability test400 lb load on seat250 lb load on seatSame test, higher load on seat
18. Leg strength test – front application & side application100 lbf/150 lbf75 lbf/113 lbfSame test; increased load
19. Arm durability test100 lbf90 lbfSame test; increased load
20. Out Stop Tests for Chairs with anually Adjustable Seat Depth163 lb/55 lb horizontal164 lb/55 lb horizontalSame
21. Tablet Arm Static Load Test150 lb load150 lb loadSame
22. Tablet Arm Load Ease Test – Cyclic55 lb load,100 000 cycles77 lb load,100 000 cyclesSame test, lowered load
23. Structural Durability Test – CyclicNo such testExclusive to X5.11

Tests not required in X5.11 but required in X5.1:

  • X5.1 – Test #7 Base Test – Static
  • X5.1 – Test #19 Footrest Static Load Têst – Vertical
  • X5.1 – Test #19 Footrest Durability Test – Vertical – Cyclic

Other Related Test Methods

For additional related test methods please see;  BIFMA TestingBIFMA X5.1, BIFMA X5.4 or BIFMA x5.41 testing.