1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories Inc.(UL). It is normative for the a
2、pplicable UL Product Certification Program(s); however, it is currently notpart of the UL Standard(s) referenced below.Standard Number: UL 2796Standard Title: Standard for Sustainability for Odor Control ProductsEdition Date: August 6, 2013Edition Number: 1Section / Paragraph Reference: Amendment AS
3、ubject: An additional testing option includedDECISION:There is currently one method to conduct an odor panel evaluation for efficacy. Upon evaluation, and inreponse to a query about a second method, , we believe that a second method should be included.Proposed Amendment to UL 2796PRODUCT PERFORMANCE
4、 TESTING7A.1 Products shall demonstrate their ability to control odors in accordance with one of the following testprocedures:a) Odor control products must perform as well as at least two conventional, functionallyequivalent products that are available in North America when tested against Standard G
5、uide forAssessing the Efficacy of Air Care Products in Reducing Sensorily Perceived Indoor Air MalodorIntensity, ASTM E1593 or Standard Practice for Determination of Odor and Taste ThresholdsBy a Forced-Choice Ascending Concentration Series Method of Limits, ASTM E679. Forbiologically-based odor con
6、trol products, a real-life source of malodor must be used instead ofsynthetic malodors as samples and testing should follow any application and time requirementsstated on the product label to allow time for the microbial components to react; orb) The test method specified in Section 8 for ambient od
7、or control products only.RATIONALE FOR DECISION:The original standard CCD-107 only permitted a single test method to demonstrate efficacy. Upon reviewof this additional ASTM method (E679), it is also considered sufficient to demonstrate efficacy and resultsfrom this method should also be acceptable.
8、 A comparison of the two ASTM methods is below.As for ASTM E679 vs E1593, some of the key differences are below.E679 makes a series of forced 3-way choices (among control, test and blank) to establish a detectionthreshold and then a recognition threshold (serial challenges of ascending concentration
9、). The productpresentations are adapted for use with small volumes of air or liquid which would seem appropriate formicrobial odor control products (drain cleaners?). If the recognition threshold of the control is much lowerthan the test material, then the odor control product would seem to work. Ho
10、w much difference do weneed to see though between the product and the control to deem the product effective?UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULE1593 uses multiple chambers that are dosed and then assessors enter and rate the odor.
11、 The facility forthis would be much more involved (walk-in chambers vs flasks). The time needed would be greater as wellsince the method recommends that only 1 assessor be in a chamber at a time whereas more than oneassessor could be sniffing a set of flasks at a time.The stats differ as well. E1593
12、 says to use any of several procedures (examples are given). E679 usesthe geometric mean of the thresholds (binomial data: yes or no). E679 can be used to measure thresholddifferences between 2 samples (test and control) as well as establish threshold for a single material.Summary It seems that the
13、substitution is reasonable.Copyright 2013 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certificati
14、on Requirement Decisions are the opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not represent formal interpretations of thestandard under American National Standards Institute (ANSI) processes. UL shall not be responsible toanyone for the u
15、se of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including consequential damages, arising out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 2796 -2-
