I would suggest contacting Doug Pauls at Contamination Studies Labs 
     ([log in to unmask]) for answers. As you can tell by his email name he 
     has been knee deep in SIR testing for several years and is also 
     heavily involved in the IPC committees concerning SIR. 
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: SIR questions from Japanese colleague
Author:  [log in to unmask] at ccmgw1
Date:    6/12/96 8:17 PM


     
These question were faxed to me by a Japanese colleague 
responsible for JIS SIR standards.
I am sending him a copy of the IPC SIR handbook, and answers
to some of the questions.  If anyone has any answers or insight 
to add, I'll forward it to him.  (I know, question 8 doesn't 
make sense, and some of the other questions are cryptic.)
     
  11 Questions regarding SIR testing from 
     
     A. Kiyosue
     Alpha Metals Japan Ltd.
     5-50 Shinmachi Hiratsuka
     Kanagawa Japan
     
1/ Is there any acceleration coefficient between set 
   temperature and humidity condition?
   further, what is the relationship of service environment 
   conditions and life?
   Would you indicate the formula for life?
     
2/ What is the relationship between the temperature/humidity 
   condition of the environment test, and the time before 
   short circuit (migration) occurs?
     
3/ Would you indicate the admissible range of set temperatures 
   and humidities. Also indicate how life is effected by this 
   range?
     
4/ What is the basis for determining the value of bias voltage
   to be applied?
     
5/ To what extent the temperature by unsaturated PCT (Pressure
   Cooker Test) may be applied?
     
6/ What is the basis for the standard test conditions (85C 85%RH,
   40C 90%RH, etc.)?
     
7/ It seems that the environment test conditions are similar to 
   those of a single test; what do you think about the complex 
   acceleration test?
     
8/ Has the environment test established by taking into 
   consideration test?
     
9/  Has the environment test conditions such 40C/95%RH,
    85C/85%RH,60C/90%RH? Is it possible to classify them 
    based on test samples?
     
10/ What difference of the effects on life between the case 
    that the bias voltage is applied at intervals and the 
    case that voltage is applied continuously?
     
11/ What is the relationship between the bias voltage applied 
    and the before short-circuit (migration) occurs?