<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET AS OF SEPTEMBER 30, 2000 AND DECEMBER 31, 1999 AND
THE STATEMENT OF OPERATIONS FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30,
2000 AND SEPTEMBER 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000884269
<NAME> ALPHA PRO TECH, LTD.
<MULTIPLIER> 1,000

<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000             DEC-31-2000
<PERIOD-START>                             JUL-01-2000             JAN-01-2000
<PERIOD-END>                               SEP-30-2000             SEP-30-2000
<CASH>                                           1,050                   1,050
<SECURITIES>                                         0                       0
<RECEIVABLES>                                    3,887                   3,887
<ALLOWANCES>                                        40                      40
<INVENTORY>                                      2,887                   2,887
<CURRENT-ASSETS>                                 7,990                   7,990
<PP&E>                                           4,185                   4,185
<DEPRECIATION>                                   1,634                   1,634
<TOTAL-ASSETS>                                  10,908                  10,908
<CURRENT-LIABILITIES>                            2,552                   2,552
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           242                     242
<OTHER-SE>                                      24,319                  24,319
<TOTAL-LIABILITY-AND-EQUITY>                    10,908                  10,908
<SALES>                                          5,444                  15,515
<TOTAL-REVENUES>                                 5,444                  15,515
<CGS>                                            3,104                   9,052
<TOTAL-COSTS>                                    3,104                   9,052
<OTHER-EXPENSES>                                 1,918                   5,279
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   3                      11
<INCOME-PRETAX>                                    419                   1,173
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                                419                   1,173
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                       419                   1,173
<EPS-BASIC>                                       0.02                    0.05
<EPS-DILUTED>                                     0.02                    0.05


</TABLE>