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See Section C.2.
5.6.1 General
5.6.1.1* Classification of Commodities
5.6.1.1.1
Commodity classification and the corresponding protection requirements shall be determined based on the makeup of individual storage units (i.e., unit load, pallet load).
5.6.1.1.1.1
The type and amount of materials used as part of the product and its primary packaging as well as the storage pallet shall be considered in the classification of the commodity.
5.6.1.1.2
When specific test data of commodity classification by a nationally recognized testing agency are available, the data shall be permitted to be used in determining classification of commodities.
5.6.1.2 Mixed Commodities
5.6.1.2.1
Protection requirements shall not be based on the overall commodity mix in a fire area.
5.6.1.2.2
Unless the requirements of 5.6.1.2.3 or 5.6.1.2.4 are met, mixed commodity storage shall be protected by the requirements for the highest classified commodity and storage arrangement.
5.6.1.2.3
The protection requirements for the lower commodity class shall be permitted to be utilized where all of the following are met:
  1. Up to 10 pallet loads of a higher hazard commodity, as described in 5.6.3 and 5.6.4, shall be permitted to be present in an area not exceeding 40,000 ft2 (3720 m2).
  2. The higher hazard commodity shall be randomly dispersed with no adjacent loads in any direction (including diagonally).
  3. Where the ceiling protection is based on Class I or Class II commodities, the allowable number of pallet loads for Class IV or Group A plastics shall be reduced to five.
5.6.1.2.4 Mixed Commodity Segregation
The protection requirements for the lower commodity class shall be permitted to be utilized in the area of lower commodity class, where the higher hazard material is confined to a designated area and the area is protected to the higher hazard in accordance with the requirements of this standard.
5.6.2 Pallet Types
5.6.2.1 General
When loads are palletized, the use of wood or metal pallets, or listed pallets equivalent to wood, shall be assumed in the classification of commodities.
5.6.2.2* Unreinforced Plastic Pallets
For Class I through Class IV commodities, when unreinforced polypropylene or unreinforced high-density polyethylene plastic pallets are used, the classification of the commodity unit shall be increased one class.
5.6.2.2.1
Unreinforced polypropylene or unreinforced high-density polyethylene plastic pallets shall be marked with a permanent symbol to indicate that the pallet is unreinforced.
5.6.2.3*
For Class I through Class IV commodities, when reinforced polypropylene or reinforced high-density polyethylene plastic pallets are used, the classification of the commodity unit shall be increased two classes except for Class IV commodity, which shall be increased to a cartoned unexpanded Group A plastic commodity.
5.6.2.3.1
Pallets shall be assumed to be reinforced if no permanent marking or manufacturer's certification of nonreinforcement is provided.
5.6.2.4
No increase in the commodity classification shall be required for Group A plastic commodities stored on plastic pallets.
5.6.2.5
For ceiling-only sprinkler protection, the requirements of 5.6.2.2 and 5.6.2.3 shall not apply where plastic pallets are used and where the sprinkler system uses spray sprinklers with a minimum K-factor of K-16.8 (240).
5.6.2.6
The requirements of 5.6.2.2 through 5.6.2.7 shall not apply to nonwood pallets that have demonstrated a fire hazard that is equal to or less than wood pallets and are listed as such.
5.6.2.7
For Class I through Class IV commodities stored on plastic pallets when other than wood, metal, or polypropylene or high-density polyethylene plastic pallets are used, the classification of the commodity unit shall be determined by specific testing conducted by a national testing laboratory or shall be increased two classes.
5.6.3* Commodity Classes
5.6.3.1* Class I
A Class I commodity shall be defined as a noncombustible product that meets one of the following criteria:
  1. Placed directly on wood pallets
  2. Placed in single-layer corrugated cartons, with or without single-thickness cardboard dividers, with or without pallets
  3. Shrink-wrapped or paper-wrapped as a unit load with or without pallets
5.6.3.2* Class II
A Class II commodity shall be defined as a noncombustible product that is in slatted wooden crates, solid wood boxes, multiple-layered corrugated cartons, or equivalent combustible packaging material, with or without pallets.
Paragraphs 5.6.3.3 and 5.6.4.1 were revised by a tentative interim amendment (TIA). See page 1.
5.6.3.3* Class III
5.6.3.3.1
A Class III commodity shall be defined as a product fashioned from wood, paper, natural fibers, or Group C plastics with or without cartons, boxes, or crates and with or without pallets.
5.6.3.3.2*
A Class III commodity shall be permitted to contain a limited amount (5 percent or less by weight of unexpanded plastic or 5 percent or less by volume of expanded plastic) of Group A or Group B plastics.
5.6.3.3.3
Class III commodities containing a mix of both Group A expanded and unexpanded plastics shall comply with Figure 5.6.3.3.3.1 where they are within cartons, boxes, or crates, or Figure 5.6.3.3.3.2 where they are exposed.
FIGURE 5.6.3.3.3.1 Commodities Containing a Mixture of Expanded and Unexpanded Group A Plastics.
III - Class III Commodity. Refer to 5.6.2 if a plastic pallet is used.
IV - Class IV Commodity. Refer to 5.6.2 if a plastic pallet is used.

FIGURE 5.6.3.3.3.2 Exposed Commodities Containing a Mixture of Expanded and Unexpanded Group A Plastics.
III - Class III Commodity. Refer to 5.6.2 if a plastic pallet is used.
IV - Class IV Commodity. Refer to 5.6.2 if a plastic pallet is used.
5.6.3.4* Class IV
5.6.3.4.1
A Class IV commodity shall be defined as a product, with or without pallets, that meets one of the following criteria:
  1. Constructed partially or totally of Group B plastics
  2. Consists of free-flowing Group A plastic materials
  3. Cartoned, or within a wooden container, that contains greater than 5 percent and up to 15 percent by weight of Group A unexpanded plastic.
  4. Cartoned, or within a wooden container, that contains greater than 5 percent and up to 25 percent by volume of expanded Group A plastics.
  5. Cartoned, or within a wooden container, that contains a mix of Group A expanded and unexpanded plastics and complies with Figure 5.6.3.3.3.1.
  6. Exposed, that contains greater than 5 percent and up to 15 percent by weight of Group A unexpanded plastic.
  7. Exposed, that contains a mix of Group A expanded and unexpanded plastics and complies with Figure 5.6.3.3.3.2.
5.6.3.4.2
The remaining materials shall be permitted to be noncombustible, wood, paper, natural or fibers, or Group B or Group C plastics.
5.6.4* Classification of Plastics, Elastomers, and Rubber
Plastics, elastomers, and rubber shall be classified as Group A, Group B, or Group C.
5.6.4.1* Group A
The following materials shall be classified as Group A:
  1. ABS (acrylonitrile-butadiene-styrene copolymer)
  2. Acetal (polyformaldehyde)
  3. Acrylic (polymethyl methacrylate)
  4. Butyl rubber
  5. Cellulosics (cellulose acetate, cellulose acetate butyrate, ethyl cellulose)
  6. EPDM (ethylene-propylene rubber)
  7. FRP (fiberglass-reinforced polyester)
  8. Natural rubber
  9. Nitrile-rubber (acrylonitrile-butadiene-rubber)
  10. Nylon (nylon 6, nylon 6/6)
  11. PET (thermoplastic polyester)
  12. Polybutadiene
  13. Polycarbonate
  14. Polyester elastomer
  15. Polyethylene
  16. Polypropylene
  17. Polystyrene
  18. Polyurethane
  19. PVC (polyvinyl chloride — highly plasticized, with plasticizer content greater than 20 percent) (rarely found)
  20. PVF (polyvinyl fluoride)
  21. SAN (styrene acrylonitrile)
  22. SBR (styrene-butadiene rubber)
5.6.4.1.1*
Group A plastics shall be further subdivided as either expanded or unexpanded.
5.6.4.1.1.1
A Group A expanded plastic commodity shall be defined as a product, with or without pallets, that meets one of the following criteria:
  1. Cartoned, or within a wooden container, that contains greater than 40 percent by volume of Group A expanded plastic
  2. Exposed, that contains greater than 25 percent by volume of Group A expanded plastic
5.6.4.1.1.2
A Group A unexpanded plastic commodity shall be defined as a product, with or without pallets, that meets one of the following criteria:
  1. Cartoned, or within a wooden container, that contains greater than 15 percent by weight of Group A unexpanded plastic.
  2. Cartoned, or within a wooden container, that contains greater than 25 percent and up to 40 percent by volume of Group A expanded plastic.
  3. Cartoned, or within a wooden container, that contains a mix of Group A unexpanded and expanded plastics, in compliance with Figure 5.6.3.3.3.1.
  4. Exposed, that contains greater than 15 percent by weight of Group A unexpanded plastic.
  5. Exposed, that contains greater than 5 percent and up to 25 percent by volume of Group A expanded plastic.
  6. Exposed, that contains a mix of Group A unexpanded and expanded plastics, in compliance with Figure 5.6.3.3.3.2.
5.6.4.1.1.3
The remaining materials shall be permitted to be noncombustible, wood, paper, natural or synthetic fibers, or Group A, Group B, or Group C plastics.
5.6.4.2 Group B
The following materials shall be classified as Group B:
  1. Chloroprene rubber
  2. Fluoroplastics (ECTFE — ethylene-chlorotrifluoro-ethylene copolymer; ETFE — ethylene-tetrafluoroethylene-copolymer; FEP — fluorinated ethylene-propylene copolymer)
  3. Silicone rubber
5.6.4.3 Group C
The following materials shall be classified as Group C:
  1. Fluoroplastics (PCTFE — polychlorotrifluoroethylene; PTFE — polytetrafluoroethylene)
  2. Melamine (melamine formaldehyde)
  3. Phenolic
  4. PVC (polyvinyl chloride — flexible — PVCs with plasticizer content up to 20 percent)
  5. PVDC (polyvinylidene chloride)
  6. PVDF (polyvinylidene fluoride)
  7. Urea (urea formaldehyde)
5.6.5* Classification of Rolled Paper Storage
For the purposes of this standard, the classifications of paper described in 5.6.5.1 through 5.6.5.4 shall apply and shall be used to determine the sprinkler system design criteria.
5.6.5.1 Heavyweight Class
Heavyweight class shall be defined so as to include paperboard and paper stock having a basis weight [weight per 1000 ft2 (92.9 m2)] of 20 lb (9.1 kg).
5.6.5.2 Mediumweight Class
Mediumweight class shall be defined so as to include all the broad range of papers having a basis weight [weight per 1000 ft2 (92.9 m2)] of 10 lb to 20 lb (4.5 kg to 9.1 kg).
5.6.5.3 Lightweight Class
Lightweight class shall be defined so as to include all papers having a basis weight [weight per 1000 ft2 (92.9 m2)] of 10 lb (4.5 kg).
5.6.5.4 Tissue
5.6.5.4.1
Tissue shall be defined so as to include the broad range of papers of characteristic gauzy texture, which, in some cases, are fairly transparent.
5.6.5.4.2
For the purposes of this standard, tissue shall be defined as the soft, absorbent type, regardless of basis weight — specifically, crepe wadding and the sanitary class including facial tissue, paper napkins, bathroom tissue, and toweling.

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