1. CD Status Update
Barry Verdegan
11 September 2018

2. Key Developments Second CD 11171 ballot closed
Candidate material status
SRM 2806d and ISO round robin prognosis

3. Second CD
Second CD results – will proceed to DIS, unanimous with 11 pages of comments from US and UK, mostly clarifications or editorial
6.4 require that data from at least 2 different samples be obtained for each reported threshold, i.e., 3 samples are analyzed, so ensure that each setting is used for at least 2 of these
UK various –state that SRM 2806b cannot be used with the revision
C.10 revise to keep current particle concentration limits for high particle concentrations, but for particle concentrations less than 50/mL col. 1 and 2 should be regarded as total counts (not concentration).
G.5 rather than reference ISO dilution procedure, should its text in its entirety be incorporated into ISO 11171?
Table 4 consider adding uncertainty calculation to document
Table A.1 needs the data to be generated by the round robin
Project has been placed on 48 month schedule to buy time

4. SRM 2806d Candidate Material Status
NIST has had IFTS samples for about a month and is analyzing them
Accelerated aging test in progress
SEM examination for unusual particles
APC analysis for counts
Statistical analysis of data
Until full analysis is done, NIST will not accept the material
Methodology for uncertainty analysis of SRM is being worked out

5. SRM 2806d and ISO 11171 round robin prognosis
If current samples are accepted, work should proceed quickly for SRM 2806d
Round robin results required to complete certification as consensus standard
Earliest the round robin can start is around Thanksgiving
Once a candidate material has been accepted, the round robin samples will be sent out and participants will be asked to expedite analysis
If round robin starts this calendar year, may be able to complete and have results available for discussion in May in Paris
If not, will have to delay meeting until round robin is completed.

6. Q+A