1、NFPA269 Standard Test Method for Developing Toxic Potency Data for Use in Fire Hazard Modeling 2012 Edition NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471 An International Codes and Standards Organization Become a MemberSubscribeto theRegister forSeminars, Webinars, and Online CoursesVisit theNFPA
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25、.org. 12/11Copyright 2012 National Fire Protection Association. All Rights Reserved.NFPA269Standard Test Method forDeveloping Toxic Potency Data for Use in Fire Hazard Modeling2012 EditionThis edition of NFPA 269, Standard Test Method for Developing Toxic Potency Data for Use in FireHazard Modeling,
26、 was prepared by the Technical Committee on Fire Tests. It was issued by theStandards Council on December 13, 2011, with an effective date of January 2, 2012, andsupersedes all previous editions.This edition of NFPA 269 was approved as an American National Standard on January 2, 2012.Origin and Deve
27、lopment of NFPA 269The first edition of NFPA 269 was published in 1996. It was desirable to establish a standard testmethod for the development of data for use in toxic hazard modeling. The basis of this standardwas derived from work completed by the National Institute of Standards and Technology. T
28、he2000 edition was a reconfirmation of the earlier edition. The 2007 edition was a complete revisionfor compliance with the Manual of Style for NFPATechnical Committee Documents.The 2012 edition has been revised to contain new scope statements for testing lethal toxicpotency values and new requireme
29、nts for testing reports.2691NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169.Technical Committee on Fire TestsWilliam E. Fitch, ChairPhyrefish Enterprises, Inc., FL SEFarid Alfawakhiri, American Iron and
30、Steel Institute,IL MBarry L. Badders, Jr., Southwest Research Institute,TX RTJesse J. Beitel, Hughes Associates, Inc., MD SEGordon H. Damant, Inter-City Testing the concentration of gas or fire effluent statis-tically calculated from concentration response data to pro-duce lethality in 50 percent of
31、 test animals within a specifiedexposure and postexposure time.3.3.6 Mass Loss Concentration. The mass loss of a test speci-men consumed during combustion per unit exposure cham-ber volume (gm3).3.3.7 Postflashover. The stage of a room fire during whichaverage air temperature in the upper half of th
32、e room exceeds600C.Chapter 4 Test Method4.1 Summary of Test Method.4.1.1 This method shall subject a test specimen of surfacearea 76 mm 127 mm or smaller and thickness of 50 mm orless to ignition while exposed to 50 kW/m2of radiant heat for15 minutes.4.1.2 The effluent produced shall be collected fo
33、r 30 minuteswithin a 200 L chamber to which the combustion assembly isjoined through a connecting chimney.4.1.3 Concentrations of the major gaseous toxicants shall bemonitored over the 30-minute period, with Ct products foreach determined from the integration of the areas under therespective concent
34、rationtime plots.4.1.4 The Ct product data, along with the mass loss of the testspecimen during the test, then shall be used in calculations topredict the 30-minute LC50of the test specimen.4.1.5 The predicted LC50then shall be confirmed in compa-rable tests by exposing six rats, restrained for head
35、-only exposure,for 30 minutes to the smoke produced from that mass of the testspecimen whose mass loss concentration during the 30-minuteperiod is approximately equivalent to 70 percent 10 percentand equivalent to 130 percent of its estimated LC50.4.1.6* If no more than one rat dies during the 30-mi
36、nute ex-posure, or within 14 days postexposure, to the mass loss con-centration corresponding to 70 percent of the LC50, and atleast five rats die during the 30-minute exposure, or within14 days postexposure, to the mass loss concentration corre-sponding to 130 percent of the LC50, the predicted LC5
37、0shallbe considered to be validated.4.1.7 For data representing postflashover fires, a correctionshall be made for the excess CO generated by ventilation-limited fires.4.1.8 Although the normal radiant heat flux is 50 kW/m2,other levels of flux shall be permitted to be used for specificevaluations o
38、f other fire scenarios, provided the variation isrecorded and reported.4.1.9 The test method shall also allow for measurements ofthe time to ignition and the rate of mass loss of the testspecimens.2695TEST METHOD2012 EditionChapter 5 Test Apparatus5.1 Effluent Collection and Animal Exposure Chamber.
39、5.1.1 The effluent collection and animal exposure chambershall be as shown in Figure 5.1.1(a) and Figure 5.1.1(b) andshall be of a transparent polycarbonate or polymethyl-methacrylate material with a nominal volume of 0.2 m3.5.1.2 The inside dimensions of the chamber shall be1220 mm 370 mm 450 mm.5.
40、1.3 The six animal ports, intended for head-only exposure,shall be located in a horizontal row, approximately halfwayfrom the bottom to the top of the chamber, in the front wall.5.1.4 A plastic bag with a volume of 0.05 m3shall be attached toa port at the end of the chamber to provide for gas expans
41、ion.5.1.5 The exposure box shall be equipped with a gas sam-pling port at the animal nose level in the geometric center ofthe exposure chamber and with a port for returning gases inthe end wall closest to the gas analyzers.5.1.6 A thermocouple shall be provided to monitor the tem-perature at the lev
42、el of the animal ports.5.1.7* The exposure chamber shall have two doors: one in thefront wall near the connection to the combustion cell and onein the end wall nearest the animal ports.5.2 Chimney.5.2.1 The chimney shall be as shown in Figure 5.2.1 and shallbe a stainless steel assembly with approxi
43、mate inside dimen-sions of 30 mm 300 mm and approximate width of 300 mm.5.2.2 The chimney shall connect the combustion cell to theanimal exposure chamber.5.2.3 The chimney shall be divided into three channels bystainless steel dividers.5.2.4 The center channel shall be approximately 150 mm wide.TOP
44、VIEWSIDE VIEW END VIEW63 mm I.D.Expansion bag port395 mm1240 mmExposure portsAccess doors470 mmChimneyRadiant heatersLoad cellCombustion cell187 mm305 mmFIGURE 5.1.1(b) Main Dimensions of the Radiant HeatApparatus.Smoke shutterAnimal exposure portsChimneyRadiant heatersSpecimen platformLoad cellComb
45、ustion cellFIGURE 5.1.1(a) General View of Radiant Heat Apparatus.Baffle152 mm 71.4 mm19.1 mmNOTES:1. Inside measure where applicable.2. Material is 1.6 mm stainless steel.298.5 mm19.1 mm304.8 mm31.8 mm12.7 mm12.7 mmUnderside openFIGURE 5.2.1 The Chimney in the Radiant Heat Apparatus.2696 DEVELOPING
46、 TOXIC POTENCY DATA FOR USE IN FIRE HAZARD MODELING2012 Edition5.2.5 The purpose of the channels shall be to induce smoketo travel up through the center portion of the chimney, whileair from the animal exposure chamber is drawn down throughthe outside channels to provide air to the combustion cell.5
47、.2.6 The chimney shall be connected to the underside of theanimal exposure chamber by clamps, allowing its removal forcleaning.5.2.7 The chimney shall be sealed to the animal chamber bylow-density ceramic fiber insulation of nominal 65 kg/m3.5.2.8 The other end of the chimney shall be sealed to thec
48、ombustion cell by an H-shaped trough with a small quantityof the same fiber insulation in the trough (see 5.2.7).5.3 Smoke Shutter.5.3.1 The smoke shutter shall be made of stainless steel plateand shall be situated inside the animal exposure chamber.5.3.2 The shutter shall be positioned so that it c
49、loses over thechimney opening.5.3.3 The shutter shall be hinged and provided with a posi-tive locking mechanism.5.3.4 The purpose of the shutter shall be to seal the combus-tion chamber and chimney from the exposure chamber at theend of irradiation.5.3.5 A wire attached to the shutter and a simple push rodshall be provided to allow the shutter to be closed gently.5.3.6 A wire attached to a clamp shall lock the shutter inplace.5.3.7 To produce a gastight seal, the underside of the shuttersh
