One of my responsibilities at work is to act as local expert with regard to chemical substances. One of the tasks is making sure we comply with REACH (“Registration, Evaluation, Authorisation and restriction of CHemical substances”).

The REACH directive itself is huge, numbering 515 pages in the Dutch version. In it a large number of chemicals (identified by name, CAS number and EC number) are listed as subject to rectrictions in Annex XVII. I needed a way to quickly find all the chemicals listed in the REACH directive and cross-check them with the safety data sheets of all the chemicals we use. Preferably without reading all of those pages myself!

So I turned to the python programming language. By using the pdftotext program from the poppler utilities, plain text is extracted from a PDF file and scanned for possible CAS-numbers by the function findCAS below, using a regular expression (re_findall in line 17). This obviously only works for PDF files that contain text. If you have a MSDS that consist of scanned images, this won’t work.

The main reason for using the CAS numbers is that they have a checksum digit at the end, so it is possible to verify is a string of numbers and dashes is a valid CAS number. This is what the checkCAS function does.

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import subprocess
import re

def findCAS(pdf, page=None):
    '''Find all CAS numbers on the numbered page of a file.

    Arguments:
    pdf -- Name of the PDF file to search
    page -- number of the page to search. if None, search all pages.
    '''
    if page == None:
        args = ['pdftotext', '-layout', '-q', pdf, '-']
    else:
        args = ['pdftotext', '-f', str(page), '-l', str(page), '-layout',
                '-q', pdf, '-']
    txt = subprocess.check_output(args)
    candidates =  re.findall('\d{2,6}-\d{2}-\d{1}', txt)
    checked = [x.lstrip('0') for x in candidates if checkCAS(x)]
    return list(set(checked))

def checkCAS(cas):
    '''Check if a string is a valid CAS number.

    Arguments:
    cas -- string to check
    '''
    nums = cas[::-1].replace('-', '') # all digits in reverse order
    checksum = int(nums[0]) # first digit is the checksum
    som = 0
    # Checksum method from: http://nl.wikipedia.org/wiki/CAS-nummer
    for n, d in enumerate(nums[1:]):
        som += (n+1)*int(d)
    return som % 10 == checksum

Using these functions, CAS-numbers were be extracted from the latest consolidated (with all changes merged) Dutch version of the REACH directive with the following code;

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from cas import findCAS

for p in xrange(165, 515+1):
    nrs = findCAS('REACH-2006R1907-20120605-nl.pdf', p)
    if not nrs:
        continue
    line = '{:03d}:'.format(p)
    for n in nrs:
        if len(line)+len(n) > 80:
            print line
            line = '     {}'.format(n)
        else:
            line += ' {}'.format(n)
    print line

This code produces a formatted list consisting of a page number followed by a colon followed by the CAS numbers that are found on that page. Not all the numbers are those of restricted substances. Only those on the substances list in Annex XVII (pages 215-247 in the Dutch version of the REACH directive) and in the Appendices 1 through 6 (pages 251-508) are relevant to the company that I work for. The higher appendices deal with asbestos and azo-colorants, neither of which we use. The whole list of substances is given below:

165: 50-99-7 124-38-9 7440-37-1 7440-01-9 527-07-1 7440-59-7 59-51-8 8029-43-4
     150-30-1 50-70-4 58-95-7 7727-37-9 8002-43-5 57-48-7 57-50-1 56-87-1
     7440-63-3 7439-90-9 1338-43-8 137-08-6 7732-18-5 50-81-7 69-65-8 87-79-6
     59-23-4 123-94-4 63-42-3
166: 61788-59-8 85665-33-4 9004-53-9 65996-61-4 14906-97-9 9005-25-8 68308-54-3
     8030-12-4 26836-47-5 68131-37-3 9050-36-6 67701-30-8 68424-61-3
209: 101-77-9 117-81-7 134237-52-8 3194-55-6 25637-99-4 134237-51-7 81-15-2
210: 84-69-5 85-68-7 1327-53-3 1344-37-2 84-74-2 7758-97-6 1303-28-2
211: 121-14-2 115-96-8 12656-85-8
215: 75-01-4
216: 126-72-7
217: 77536-68-6 12001-29-5 71-43-2 12001-28-4 12172-73-5 77536-66-4 77536-67-5
     132207-32-0
218: 545-55-1 59536-65-1 68990-67-0
219: 12135-76-1 9080-17-5 35223-80-4 18991-98-5 552-89-6 12124-99-1 92-87-5
     96-32-2 105-36-2
220: 91-59-8 92-67-1 1319-46-6 92-87-5 7446-14-2 15739-80-7 598-63-0 92-93-3
221: 7439-97-6
226: 75113-37-0 7440-43-9 87-86-5
230: 76253-60-6
231: 7440-02-0 99688-47-8
233: 65996-85-2 122384-78-5 8021-39-4 61789-28-4 8001-58-9 90640-80-5 65996-91-0
     90640-84-9 84650-04-4
234: 75-35-4 76-01-7 630-20-6 79-34-5 79-00-5 67-66-3
236: 85535-84-8 67-72-1
237: 25154-52-3
239: 192-97-2 56-55-3 218-01-9 205-99-2 207-08-9 205-82-3 50-32-8 120-82-1
     108-88-3
240: 117-81-7 53-70-3
241: 26761-40-0 28553-12-0 85-68-7 117-84-0 68515-49-1 111-77-3 84-74-2
     68515-48-0
242: 26447-40-5 112-34-5
243: 110-82-7 6484-52-2
244: 75-09-2
247: 624-49-7 79-06-1
251: 65405-96-1 11099-02-8 1333-82-0 12035-71-1 7718-54-9 7786-81-4 12054-48-7
     11113-74-9 16337-84-1 11113-75-0 12035-36-8 3333-67-3 1314-04-1 1313-99-1
     16812-54-7 34492-97-2 12607-70-4 12035-72-2 1314-06-3
252: 26043-11-8 13637-71-3 13462-88-9 94551-87-8 373-02-4 2223-95-2 4995-91-9
     10028-18-9 553-71-9 15699-18-0 11132-10-8 16039-61-5 3906-55-6 13842-46-1
     69012-50-6 68134-59-8 13462-90-3 14216-75-2 3349-06-2 13138-45-9 14998-37-9
     15843-02-4 13770-89-3 92129-57-2 14708-14-6
253: 10381-36-9 68186-89-0 20543-06-0 14874-78-3 14507-36-9 31-00-5 21784-78-1
     18718-11-1 547-67-1 39-00-9 35-00-7 15060-62-5 74195-78-1 14332-34-4
     36026-88-7 12519-85-6 17169-61-8 14721-18-7 37321-15-6 12737-30-3 13477-70-8
     12137-12-1 31748-25-1 58591-45-0 74646-29-0 19372-20-4 13775-54-7 12142-88-0
     557-19-7 14448-18-1
254: 14550-87-9 13689-92-4 7580-31-6 27637-46-3 93983-68-7 12035-38-0 27016-75-7
     49-00-3 4454-16-4 45-00-1 15586-38-6 15780-33-3 67952-43-6 71720-48-4
     29317-63-3 12068-61-0 68610-24-2 68130-19-8 22605-92-1 10101-96-9 18283-82-4
     84852-37-9 18721-51-2 3349-08-4 16083-14-0 1314-05-2 39819-65-3
255: 93920-10-6 71957-07-8 84776-45-4 93920-09-3 85508-43-6 85166-19-4 15852-21-8
     51818-56-5 91697-41-5 84852-35-7 84852-36-8 72319-19-8 84852-39-1 85551-28-6
     85135-77-9 85508-44-7 15851-52-2 52625-25-9 7757-95-1 85508-45-8 13654-40-5
     85508-46-9 68130-36-9
256: 12035-39-1 14177-55-0 7784-40-9 12007-00-0 12031-65-1 12007-01-1 52502-12-2
     68016-03-5 14177-51-6 12619-90-8 12007-02-2 70692-93-2 12653-76-8 65229-23-4
     12201-89-7 12035-64-2 1303-28-2 12673-58-4 12004-35-2 1327-53-3 12059-14-2
     68515-84-4
257: 23-00-7 92-67-1 107-30-2 91-59-8 42-00-2 20-00-8 71-43-2 8007-45-2 75-28-5
     106-97-8 65996-89-6 75-01-4 92-87-5 75-00-3 553-00-4 612-52-2 106-99-0
     15606-95-8 542-88-1
258: 101316-83-0 65996-90-9 50-00-0 101316-84-1 64741-50-0
259: 64741-52-2 64741-51-1 64742-18-3 54-00-2 64741-53-3
260: 64742-27-4 58-00-4 64742-19-4 64742-20-7 64742-21-8
261: 64742-35-4 64742-34-3 68477-73-6 64742-28-5
262: 68477-75-8 68477-74-7 68477-83-8 68477-76-9 68477-79-2
263: 68477-90-7 68477-85-0 68477-87-2 68477-91-8 68477-86-1 68477-94-1
264: 68477-99-6 68478-24-0 68477-95-2 68478-22-8 68478-21-7
265: 68478-32-0 68478-26-2 68478-34-2 68478-33-1
266: 68513-17-7 68513-66-6 68512-91-4 68513-16-6 68513-15-5
267: 68527-16-2 68606-27-9 68514-31-8 68606-25-7 93-00-5 68606-26-8 68514-36-3
     68602-83-5 68527-19-5
268: 68918-99-0 68783-64-2 68783-07-3 68783-65-3 97-00-7 68606-34-8
269: 68919-06-2 68919-05-1 68919-20-0 68919-00-6 68919-09-5
270: 68952-76-1 68952-82-9 68952-81-8 68919-10-8 68952-77-2
271: 92045-23-3 90622-55-2 68955-28-2 92045-22-2 68955-34-0
272: 121-00-6 97722-19-5 68477-65-6 92045-80-2 68477-67-8 68477-66-7 95465-89-7
273: 68477-81-6 68477-68-9 68477-77-0 125-00-8 68477-82-7 68477-80-5
274: 68477-84-9 131-00-0 68477-92-9 68477-97-4 68477-93-0 68477-96-3
275: 68477-98-5 68478-00-2 68478-02-4 135-00-2 68478-01-3
276: 139-00-4 68478-05-7 68478-04-6 68478-25-1 68478-03-5
277: 68478-29-5 68513-14-4 68478-28-4 68478-30-8 68478-27-3
278: 68527-15-1 68513-18-8 68602-82-4 68513-19-9
279: 68814-90-4 68814-67-5 68602-84-6 68783-06-2 68607-11-4
280: 68911-58-0 68919-01-7 68911-59-1 68919-02-8
281: 68919-11-9 160-00-9 68919-03-9 68919-04-0 68919-07-3 68919-08-4
282: 68955-33-9 68952-80-7 68919-12-0 68989-88-8 68952-79-4
283: 170-00-3 92045-17-5 92045-16-4 92045-18-6 92045-15-3
284: 174-00-5 92045-19-7 178-00-7 68307-98-2 92045-20-0 68131-75-9
285: 68308-00-9 68307-99-3 68308-10-1 68308-01-0
286: 68308-06-5 68308-03-2 68308-04-3 68308-05-4
287: 68308-12-3 68308-07-6 68308-11-2 188-00-1 68308-09-8
288: 68476-49-3 68409-99-4 68475-58-1 68476-85-7 202-00-6 68476-29-9 68475-60-5
     68475-57-0 68476-42-6 68475-59-2 68476-40-4 68476-26-6
289: 68476-86-8 68477-33-8 68477-69-0 206-00-8 68477-35-0 68477-70-3
290: 77536-68-6 77536-66-4 68477-72-5 12510-42-8 12001-28-4 68308-08-7 12001-29-5
     12-00-0 77536-67-5 68477-71-4 132207-32-0 12172-73-5
291: 1304-56-9 542-56-3 302-01-2 68-00-8 79-44-7 122-66-7 334-88-3 680-31-9
     102-00-1 95-06-7 540-73-8 57-14-7 7440-41-7 103122-66-3 14-00-6
292: 64-67-5 7789-09-5 14977-61-8 10141-05-6 7789-06-2 1120-71-4 13765-19-0
     513-79-1 7646-79-9 6-00-8 10588-01-9 7775-11-3 10108-64-2 7778-50-9
     7789-00-6 71-48-7 24613-89-6 7790-79-6 1306-19-0 7758-01-2 13360-57-1 2-00-6
     77-78-1 10124-43-3
293: 192-97-2 106-93-4 78-79-5 218-01-9 4-00-2 1344-37-2 205-82-3 34-00-4 53-70-3
     205-99-2 10-00-4 10124-36-4 56-55-3 12656-85-8 7440-43-9 207-08-9 1306-23-6
     50-32-8 107-06-2 7758-97-6 48-00-0
294: 126-99-8 110-00-9 75-56-9 122-60-1 96-09-3 1464-53-5 37-00-3 51594-55-9
     3033-77-0 96-13-9 98-07-7 118-74-1 5216-25-1 79-01-6 593-60-2 75-21-8
     96-12-8 100-44-7 556-52-5 26-00-6 96-18-4 57044-25-4 764-41-0 106-89-8
     27-00-9 96-23-1
295: 51-79-6 581-89-5 90-94-8 92-93-3 25321-14-6 77402-03-0 214353-17-0 399-95-1
     602-87-9 57-57-8 121-14-2 77-09-8 107-13-1 103112-35-2 79-46-9 70987-78-9
     94-59-7 77402-05-2
296: 602-01-7 88-72-2 4-00-2 610-39-9 1937-37-7 47-00-7 8-00-4 60-09-3 618-85-9
     91-23-6 619-15-8 592-62-1 103-33-3 2602-46-2 16071-86-6 1836-75-5 97-56-3
     573-58-0 606-20-2
297: 52033-74-6 119-93-7 613-35-4 2475-45-8 101-77-9 100-63-0 108225-03-2
     85136-74-9 59-88-1 90-04-0 164058-22-4 91-94-1 57-00-1 119-90-4 27140-08-5
298: 106-47-8 62-75-9 137-17-7 81-00-5 612-82-8 99-00-3 85-00-7 95-80-7 612-83-9
     21436-97-5 1116-54-7 74332-73-3 64969-34-2 101-14-4 64969-36-4 65321-67-7
     621-64-7 74753-18-7 95-53-4 70-25-7 3165-93-3 95-69-2 838-88-0
299: 75-55-8 120-71-8 101-80-4 139-65-1 151-56-4 39156-41-7 615-05-4 101-61-1
     40722-80-3 91-95-2 200-00-0 6804-07-5 548-62-9 132-32-1
300: 94114-40-6 26-00-6 2-00-6 84245-12-5 62-55-5 91-22-5 281-00-5 65996-88-5
     84650-02-2 79-06-1
301: 101896-26-8 90641-12-6 85536-17-0 90989-41-6 12-00-0 6-00-8 85536-20-5
     90989-38-1 91995-20-9 85536-19-2
302: 90641-02-4 93821-38-6 91995-61-8 92062-36-7 16-00-2 101316-63-6
303: 90641-03-5 101316-62-5 65996-79-4 90640-87-2 101794-90-5
304: 65996-82-9 90641-01-3 90640-99-6 65996-87-4 84650-03-3
305: 68937-63-3 92062-27-6 92062-28-7 91082-52-9 68391-11-7 92062-33-4
306: 91082-53-0 91995-31-2 122070-79-5 91995-66-3 91995-35-6
307: 90640-85-0 122070-80-8 90640-86-1 84989-11-7 41-00-9 101316-45-4
308: 91995-42-5 101316-49-8 91995-51-6 91995-14-1 65996-92-1
309: 97926-77-7 51-00-3 61789-60-4 65996-93-2 55-00-5 91995-52-7 97926-76-6
310: 121575-60-8 59-00-7 94114-13-3 92062-20-9 92061-94-4 91082-50-7
311: 68990-61-4 92062-34-5 100684-51-3 91697-23-3 92045-71-1
312: 101316-85-2 90669-57-1 92045-72-2 90669-59-3 97926-78-8 69-00-1
313: 101794-75-6 90669-58-2 68188-48-7 101794-74-5
314: 101794-76-7 92061-93-3 68187-57-5 122070-78-4 84989-10-6
315: 91995-49-2 121620-47-1 85029-51-2 84989-09-3 84650-04-4
316: 101794-91-6 90641-04-6 90640-90-7 101896-27-9 121620-48-2 90-00-6
317: 94-00-8 90641-05-7 91995-48-1 121620-46-0 84989-12-8
318: 122384-77-4 61789-28-4 90640-84-9 70321-79-8 8001-58-9
319: 90640-82-7 91995-16-3 90640-81-6 92061-92-2 91995-15-2
320: 101316-87-4 90640-88-3 91995-17-4 122384-78-5 84988-93-2
321: 90640-89-4 90641-06-8 65996-85-2 65996-83-0 101316-86-3
322: 122-00-9 84989-05-9 84989-04-8 84989-07-1 92062-22-1 84989-03-7 84989-06-0
     96690-55-0
323: 92062-26-5 68555-24-8 90641-00-2 132-00-3 94114-29-1 91079-47-9 68477-23-6
     68513-87-1 70321-67-4
324: 100801-63-6 92062-29-8 100801-65-8 136-00-5 100801-66-9
325: 70321-80-1 65996-84-1 94114-46-2 65996-86-3 68815-21-4
326: 94114-52-0 94114-47-3 65996-78-3 94114-48-4
327: 94114-54-2 94114-55-3 94114-53-1
328: 1-00-3 64742-03-6 90641-11-5 64742-05-8 64742-04-7 94114-56-4 94114-57-5
329: 64741-57-7 64741-61-3 5-00-5 64742-11-6 64741-45-3 97722-04-8 9-00-7
     91995-78-7
330: 64741-80-6 64741-62-4 64741-75-9 64741-81-7
331: 64742-59-2 64742-78-5 64742-86-5
332: 68333-26-6 68333-22-2 19-00-1 64742-90-1
333: 68476-32-4 68333-28-8 68476-33-5 68478-13-7 68333-27-7
334: 68512-61-8 68512-62-9 68478-17-1 68513-69-9 68553-00-4
335: 68955-27-1 68783-08-4 68783-13-1 68955-36-2 68607-30-7
336: 70592-76-6 70592-78-8 70592-77-7 85117-03-9
337: 40-00-6 92061-97-7 92045-14-2 44-00-8 90669-76-4 90669-75-3 92201-59-7
338: 64741-67-9 93821-66-0 101316-57-8 98219-64-8
339: 93924-32-4 8002-05-9 93924-31-3
340: 64741-91-9 64741-90-8 64741-86-2 97862-76-5 212-00-0
341: 64742-29-6 64742-13-8 64742-12-7 64742-14-9 216-00-2 64742-30-9
342: 64742-46-7 64742-80-9 64742-38-7 64742-79-6
343: 68477-30-5 68477-29-2 91995-34-5 68477-31-6 90640-93-0
344: 97675-86-0 97675-85-9 97722-08-2 97488-96-5 93924-33-5
345: 100683-99-6 100683-98-5 241-00-9 100683-97-4 90622-53-0 97862-78-7
346: 92062-09-4 74869-21-9 90669-78-6 64742-61-6 90669-77-5
347: 92062-10-7 97863-05-3 92062-11-8 97863-04-2 251-00-3
348: 85029-74-9 64743-01-7 97863-06-4 8009-03-8 100684-49-9 255-00-5
349: 92045-77-7 97862-97-0 100684-33-1 8006-61-9 97862-98-1 259-00-7
350: 64742-89-8 8030-30-6 64741-46-4 64741-42-0 64741-41-9 8032-32-4
351: 68783-12-0 68410-05-9 269-00-1 68606-11-1 68514-15-8
352: 64741-65-7 64741-66-8 101631-20-3 64741-64-6
353: 64741-84-0 64741-70-4 68410-71-9 68425-35-4 64741-92-0
354: 92045-55-1 92045-49-3 68527-27-5 91995-53-8
355: 92045-64-2 92045-58-4 101316-67-0 64741-54-4
356: 91995-50-5 64741-55-5 290-00-6 68476-46-0 294-00-8 68783-09-5 92045-50-6
357: 101896-28-0 92045-59-5 101794-97-2 64741-63-5 92128-94-4
358: 68476-47-1 68478-15-9 68513-03-1 68475-79-6 64741-68-0
359: 68514-79-4 68955-35-1 85116-58-1 68919-37-9 68513-63-3
360: 93572-35-1 91995-18-5 93572-29-3 93571-75-6
361: 97862-77-6 64741-74-8 64741-83-9 93572-36-2
362: 68475-70-7 67891-80-9 67891-79-6 68425-29-6
363: 68603-00-9 68603-03-2 322-00-9 68603-01-0 68955-29-3
364: 64742-49-0 64742-73-0 64742-48-9 64742-82-1 92045-65-3
365: 332-00-3 68410-97-9 68410-98-0 68410-96-8 68512-78-7
366: 92045-52-8 85116-61-6 336-00-5 92045-57-3 92045-51-7 85116-60-5
367: 92045-61-9 93165-55-0 93763-33-8 92062-15-2
368: 93763-34-9 64741-48-6 8052-41-3 64741-47-5 64741-69-1
369: 64741-87-3 64742-23-0 64742-15-0 64742-22-9 64741-78-2
370: 64742-83-2 68477-34-9 64742-66-1 64742-95-6 68131-49-7
371: 68477-50-9 68477-53-2 68477-55-4 68477-61-2
372: 68478-16-0 68527-21-9 68478-12-6 68516-20-1 68513-02-0
373: 68606-10-0 68527-22-0 68527-26-4 68603-08-7 371-00-6 68527-23-1
374: 68921-09-5 68783-66-4 85116-59-2 68919-39-1 375-00-8
375: 381-00-0 91995-38-9 86290-81-5 91995-68-5 90989-42-7 91995-41-4
376: 385-00-2 92045-53-9 92045-60-8 92045-62-0 92045-63-1
377: 97926-43-7 389-00-4 92201-97-3 95009-23-7 94114-03-1 93165-19-6
378: 101316-56-7 101316-66-9 98219-47-7 98219-46-6
379: 102110-14-5 101795-01-1 102110-15-6 101316-76-1
380: 64741-59-9 64741-60-2 403-00-9 90989-39-2 68476-50-6 68476-55-1 102110-55-4
381: 64741-82-8 68333-25-5 68477-38-3 68475-80-9
382: 92062-00-5 92062-04-9 92045-29-9 68527-18-4 85116-53-6
383: 101316-59-0 97926-59-5 92201-60-0 93763-85-0
384: 64741-88-4 452-00-6 64741-89-5 101631-14-5 64741-76-0
385: 64741-97-5 456-00-8 64742-01-4 64741-96-4 64741-95-3
386: 462-00-0 64742-36-5 64742-37-6 64742-41-2
387: 64742-45-6 64742-44-5 64742-52-5
388: 64742-56-9 64742-53-6 466-00-2 64742-54-7 64742-55-8
389: 64742-57-0 64742-64-9 64742-63-8 64742-62-7
390: 64742-68-3 64742-69-4 64742-65-0 64742-70-7
391: 64742-76-3 64742-75-2 64742-71-8 72623-85-9
392: 72623-87-1 74869-22-0 72623-86-0 90640-91-8
393: 90640-95-2 90640-96-3 90640-92-9 90640-94-1
394: 91995-40-3 90669-74-2 91770-57-9 491-00-9 91995-39-0 90640-97-4
395: 92129-09-4 91995-54-9 91995-45-8 92061-86-4 92045-42-6 92045-43-7
396: 94733-08-1 94733-15-0 93924-61-9 94733-09-2 93572-43-1 93763-38-3
397: 95371-08-7 94733-16-1 97488-73-8 95371-05-4 95371-04-3 95371-07-6
398: 97488-74-9 97722-06-0 97675-87-1 97488-95-4
399: 97862-83-4 97722-09-3 97926-71-1 97722-10-6 97862-82-3 97926-70-0 97862-81-2
     97926-68-6
400: 100684-38-6 101316-70-5 100684-37-5 101316-69-2
401: 68783-00-6 68783-04-0 101316-71-6 101316-72-7
402: 90641-07-9 533-00-6 90641-09-1 90641-08-0 68814-89-1
403: 91995-73-2 537-00-8 91995-76-5 91995-75-4
404: 91995-77-6 92704-08-0 91995-79-8
405: 93763-10-1 93763-11-2 543-00-0 100684-02-4
406: 100684-05-7 100684-03-5 100684-04-6 547-00-2 92045-12-0 64742-67-2
409: 7789-00-6 10108-64-2 1333-82-0 7789-09-5 7778-50-9 2-00-6 680-31-9 7790-79-6
     64-67-5 10124-36-4 102-00-1 10588-01-9 6-00-8 103122-66-3 7775-11-3
     14977-61-8
410: 17804-35-2 88-72-2 151-56-4 49-00-3 20-00-8 71-43-2 75-56-9 75-28-5 106-97-8
     101-80-4 2040-90-6 10605-21-7 40722-80-3 77402-05-2 77402-03-0 106-99-0
     75-21-8 50-32-8 1464-53-5 96-12-8
411: 101896-26-8 2-00-6 84245-12-5 2451-62-9 59653-74-6 65996-88-5 94114-40-6
     64-86-8 79-06-1
412: 90641-12-6 85536-17-0 90989-41-6 12-00-0 92062-36-7 6-00-8 85536-20-5
     90989-38-1 91995-20-9 85536-19-2
413: 90641-02-4 101316-63-6 91995-61-8 93821-38-6 16-00-2
414: 90641-03-5 101316-62-5 65996-79-4 101794-90-5
415: 65996-82-9 90641-01-3 90640-87-2 65996-87-4 84650-03-3
416: 68391-11-7 90640-99-6 91082-52-9 68937-63-3 92062-33-4
417: 92062-28-7 91082-53-0 92062-27-6 91995-31-2
418: 91995-66-3 91995-35-6 122070-79-5
419: 84650-04-4 85029-51-2 84989-09-3 122070-80-8
420: 121620-47-1 90-00-6 91995-49-2 121620-48-2 90640-90-7
421: 94-00-8 101794-91-6 91995-48-1 90641-04-6 101896-27-9
422: 90641-05-7 84989-12-8 90640-81-6 121620-46-0
423: 90640-82-7 91995-16-3 92061-92-2 91995-15-2
424: 101316-87-4 91995-17-4 122384-78-5 84988-93-2
425: 90640-89-4 90641-06-8 90640-88-3 65996-83-0
426: 92062-22-1 96690-55-0 101316-86-3 65996-85-2 84989-04-8
427: 68555-24-8 84989-03-7 84989-05-9 84989-07-1 68477-23-6 122-00-9 84989-06-0
428: 92062-26-5 90641-00-2 132-00-3 92062-29-8 68513-87-1 91079-47-9 94114-29-1
     70321-67-4
429: 100801-63-6 73665-18-6 100801-65-8 136-00-5 100801-66-9
430: 94114-52-0 65996-78-3 65996-84-1 65996-86-3 68815-21-4
431: 94114-54-2 94114-56-4 94114-53-1
432: 68477-75-8 68477-73-6 68477-74-7 94114-57-5 90641-11-5
433: 68477-86-1 68477-85-0 68477-76-9 68477-83-8 68477-79-2
434: 68477-90-7 68477-87-2 68477-95-2 68477-91-8 68477-99-6 68477-94-1
435: 68478-21-7 68478-26-2 68478-22-8 68478-24-0
436: 68513-15-5 68478-32-0 68512-91-4 68478-34-2 68478-33-1
437: 68514-31-8 68513-17-7 68513-66-6 68514-36-3 68513-16-6
438: 68527-16-2 68606-27-9 68606-25-7 93-00-5 68783-07-3 68606-26-8 68602-83-5
     68527-19-5 97-00-7 68783-64-2 68606-34-8
439: 68919-06-2 68918-99-0 68919-05-1 68919-00-6 68783-65-3
440: 68952-76-1 68919-20-0 68919-09-5 68919-10-8 68952-77-2
441: 68952-82-9 68955-28-2 87741-01-3 90622-55-2 68952-81-8 68955-34-0
442: 92045-23-3 92045-80-2 97722-19-5 92045-22-2 95465-89-7
443: 121-00-6 68477-68-9 68477-67-8 68477-77-0 68477-66-7 68477-65-6
444: 68477-81-6 68477-84-9 68477-92-9 125-00-8 68477-82-7 68477-80-5
445: 68477-98-5 68478-00-2 131-00-0 68477-97-4 68477-93-0 68477-96-3
446: 68478-03-5 68478-04-6 68478-01-3 139-00-4 68478-05-7 68478-02-4 135-00-2
447: 68478-29-5 68478-25-1 68478-30-8 68478-28-4 68478-27-3
448: 68527-15-1 68513-14-4 68602-82-4 68513-18-8 68513-19-9
449: 68814-90-4 68814-67-5 68602-84-6 68783-06-2 68607-11-4
450: 68911-58-0 68919-01-7 68911-59-1 68919-02-8
451: 68919-11-9 160-00-9 68919-03-9 68919-04-0 68919-07-3 68919-08-4
452: 68955-33-9 68952-80-7 68919-12-0 68989-88-8 68952-79-4
453: 170-00-3 92045-17-5 92045-16-4 92045-18-6 92045-15-3
454: 174-00-5 92045-19-7 178-00-7 68307-98-2 92045-20-0 68131-75-9
455: 68308-00-9 68307-99-3 68308-10-1 68308-01-0
456: 68308-06-5 68308-03-2 68308-04-3 68308-07-6 68308-05-4
457: 68409-99-4 68475-58-1 68308-12-3 68308-09-8 68475-57-0 68308-11-2 188-00-1
     68475-59-2 68475-60-5
458: 68476-49-3 68476-85-7 68476-86-8 202-00-6 68476-29-9 68476-42-6 68476-40-4
     68476-26-6
459: 68477-33-8 68477-69-0 206-00-8 68477-35-0 68477-71-4 68477-70-3
460: 68477-72-5 8030-30-6 68308-08-7 8032-32-4 8006-61-9
461: 64742-89-8 64741-41-9 64741-46-4 64741-42-0
462: 68783-12-0 68921-08-4 68606-11-1 68514-15-8 68410-05-9 269-00-1
463: 64741-65-7 64741-66-8 101631-20-3 64741-64-6
464: 64741-84-0 64741-70-4 68410-71-9 64741-92-0
465: 68425-35-4 92045-49-3 68527-27-5 91995-53-8
466: 92045-55-1 92045-64-2 92045-58-4 101316-67-0
467: 290-00-6 68476-46-0 64741-55-5 68783-09-5 64741-54-4
468: 91995-50-5 92128-94-4 92045-59-5 294-00-8 92045-50-6
469: 101896-28-0 64741-63-5 64741-68-0 101794-97-2
470: 68476-47-1 68478-15-9 68513-03-1 68475-79-6
471: 68514-79-4 68955-35-1 68919-37-9 68513-63-3
472: 85116-58-1 91995-18-5 93572-29-3 93571-75-6
473: 64741-74-8 93572-36-2 64741-83-9 93572-35-1
474: 68475-70-7 67891-80-9 67891-79-6 68425-29-6
475: 68603-00-9 68603-03-2 322-00-9 68603-01-0 68955-29-3
476: 64742-49-0 64742-73-0 64742-48-9 92045-65-3
477: 332-00-3 68410-97-9 68410-98-0 68410-96-8 64742-82-1
478: 68512-78-7 92045-52-8 85116-61-6 336-00-5 92045-51-7 85116-60-5
479: 92045-61-9 92045-57-3 92062-15-2
480: 93165-55-0 93763-34-9 93763-33-8 8052-41-3
481: 64741-47-5 64741-69-1 64741-48-6 64741-78-2
482: 64741-87-3 64742-23-0 64742-15-0 64742-22-9
483: 64742-83-2 64742-66-1 64742-95-6 68131-49-7
484: 68477-34-9 68477-50-9 68477-53-2 68477-55-4
485: 68478-16-0 68477-89-4 68478-12-6 68477-61-2
486: 68527-21-9 68516-20-1 68513-02-0
487: 68527-22-0 68527-26-4 371-00-6 68527-23-1
488: 68606-10-0 68919-39-1 375-00-8 68921-09-5 68783-66-4 68603-08-7
489: 86290-81-5 90989-42-7 85116-59-2 91995-38-9
490: 91995-68-5 91995-41-4 92045-53-9 381-00-0 92045-60-8
491: 385-00-2 93165-19-6 92045-62-0 92045-63-1 92201-97-3
492: 389-00-4 94114-03-1 97926-43-7 98219-46-6 95009-23-7
493: 101316-56-7 101316-66-9 98219-47-7
494: 102110-14-5 101795-01-1 102110-15-6 101316-76-1
495: 68476-55-1 90989-39-2 102110-55-4 403-00-9 68476-50-6
496: 25808-74-6 7446-27-7 81-81-2 630-08-0 1335-32-6 4-00-2 17570-76-2 68130-19-8
     1344-37-2 8-00-4 94551-87-8 75-26-3 13424-46-9 15245-44-0 7758-97-6 96-12-8
     7784-40-9 301-04-2 12656-85-8
497: 1303-86-2 75113-37-0 1330-43-4 12179-04-3 7632-04-4 15120-21-5 13840-56-7
     12267-73-1 10043-35-3 11-02-9 11113-50-1 1303-96-4
498: 10332-33-9 12040-72-1 13517-20-9 11138-47-9 10486-00-7 37244-98-7
499: 115-96-8 10141-05-6 2-00-6 330-55-2 105024-66-6 71-48-7 7789-09-5 10588-01-9
     7646-79-9 77182-82-2 7778-50-9 21-00-1 10124-43-3 37894-46-5 85509-19-9
     7775-11-3
500: 7786-81-4 13637-71-3 7718-54-9 12607-70-4 12054-48-7 13842-46-1 11113-74-9
     16337-84-1 13138-45-9 15699-18-0 65405-96-1 513-79-1 3333-67-3 14708-14-6
     14216-75-2 13770-89-3 13463-39-3 92129-57-2
501: 26043-11-8 13689-92-4 13462-88-9 373-02-4 14550-87-9 2223-95-2 31-00-5
     4995-91-9 10028-18-9 553-71-9 15586-38-6 11132-10-8 67952-43-6 15060-62-5
     71720-48-4 16039-61-5 3906-55-6 18283-82-4 68134-59-8 13462-90-3 3349-06-2
     18721-51-2 14998-37-9 3349-08-4 15843-02-4 16083-14-0 39819-65-3
502: 93983-68-7 93920-10-6 71957-07-8 7580-31-6 27637-46-3 85508-44-7 93920-09-3
     85508-43-6 85166-19-4 4454-16-4 91697-41-5 29317-63-3 84852-37-9 84852-36-8
     72319-19-8 22605-92-1 84852-39-1 85551-28-6 84852-35-7 85135-77-9 84776-45-4
     51818-56-5 52625-25-9 85508-45-8 13654-40-5 85508-46-9
503: 10108-64-2 32536-52-0 556-52-5 112-49-2 109-86-4 110-71-4 7790-79-6 110-80-5
     1589-47-5 10124-36-4 7439-97-6 111-96-6 96-18-4 57044-25-4 50-32-8 106-94-5
     683-18-1
504: 117-82-8 111-15-9 94723-86-1 69806-50-4 629-14-1 80387-97-9 70657-70-4
     61571-06-0 111-41-1 62-00-0 203-00-9 5571-36-8 6807-17-6 82413-20-5 110-49-6
     872-50-4
505: 71888-89-6 42925-80-4 117-81-7 131-18-0 85-68-7 84-74-2 68515-42-4
     119738-06-6 84777-06-0 625-45-6 50471-44-8 84-69-5
506: 2795-39-3 4-00-2 29081-56-9 70225-14-8 485-31-4 1420-07-1 1763-23-1 592-62-1
     1836-75-5 88-85-7 29457-72-5 39300-45-3
507: 24602-86-6 96-45-7 49-00-3 68049-83-2 66-81-9 17804-35-2 143860-04-2
     199327-61-2 3724-43-4 10605-21-7 103361-09-7 106325-08-0 39-00-9
508: 65277-42-1 27366-72-9 183196-57-8 123-39-7 127-19-5 84245-12-5 75-12-7
     79-16-3 68-12-2
512: 101-77-9 106-47-8 42-00-2 99-00-3 97-56-3 91-94-1 137-17-7 92-67-1 139-65-1
     615-05-4 101-14-4 95-80-7 91-59-8 85-00-7 99-55-8 90-04-0 119-90-4 60-09-3
     95-53-4 119-93-7 120-71-8 101-80-4 8-00-4 92-87-5 95-69-2 838-88-0
513: 118685-33-9
515: 7632-04-4 10332-33-9 12040-72-1 15120-21-5 13517-20-9 11138-47-9 10486-00-7
     37244-98-7

Using similar code, a list of CAS numbers found in every file a directory full of safety data sheets can be found. Printing only the numbers that occur in both lists is then trivial.