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Exhibit 4.2    
    

 
 

ALPHA PRO TECH, LTD.
  NON-QUALIFIED STOCK OPTION AGREEMENT
  FOR NON-EMPLOYEE DIRECTORS    
    

	1.
	Grant of Option.  

Alpha
Pro Tech, Ltd., a Delaware corporation (the "Company"), hereby grants to David B. Anderson (the "Director"), an option, pursuant to the
Company's 2004 Stock Option Plan (the "Plan"), to purchase an aggregate of 25,000 shares of Common Stock, $.01 par value ("Common Stock"), of the
Company at a price of $1.58 per share, purchasable as set forth in and subject to the terms and conditions of this option and the Plan. Except where the
context otherwise requires, the term "Company" shall include the parent and all subsidiaries of the company as defined in Sections 425(e) and 425(f) of the Internal Revenue Code of 1986, as amended
(the "Code"). 

	2.
	Non-qualified Stock Option. ("NSO")  

This
option is not intended to qualify as an incentive stock option within the meaning of Section 422A of the Code. 

	3.
	Exercise of Option and Provisions for Termination.

	(a)
	Exercise Period  

Except
as otherwise provided in this Agreement, this option may be exercised prior to the tenth Anniversary of the date of grant, August 9, 2004, (hereinafter the "Expiration Date") as to not
more than the number of shares and during the period set forth in the table below. The right of exercise shall be cumulative so that if the option is not exercised to the maximum extent permissible
during any exercise period, it shall be exercisable, in whole or in part, with respect to all shares not so purchased at any time prior to the Expiration Date or the earlier termination of this
option. 

	Vesting Schedule
 
	 	Total No. of Shares Exercisable

	On or after the first succeeding anniversary of the date of grant of the NSO	 	25,000

This
option may not be exercised at any time on or after the Expiration Date. 

	(b)
	Exercise Procedure  

Subject
to the conditions set forth in this Agreement, this option shall be exercised by the Director's delivery of written notice of exercise to the Chief Financial Officer ("CFO") of the Company,
specifying the number of shares to be purchased and the purchase price to be paid therefore and accompanied by payment in full in accordance with Section 4. Such exercise shall be effective
upon
receipt by the CFO of the Company of such written notice together with the required payment. The Director may purchase less than the number of shares covered hereby, provided that no partial exercise
of this option may be for any fractional share or for fewer than ten whole shares. 

	(c)
	Exercise Period Upon Death or Disability  

If
the Director dies or becomes disabled (with the meaning of Section 22(e)(3) of the Code or any successor provision thereto), this option shall be exercisable, within the period of one year
following the date of death or disability of the Director (but in no event after the Expiration Date), by the Director or by the person to whom this option is transferred by will or the laws of
descent and distribution, provided that this option shall be exercisable only to the extent that this option was exercisable by the Director on the date
of his or her death or disability. Except as otherwise indicated by the context, the term "Director", as used in this option, shall 

 

be
deemed to include the estate of the Director or any person who acquires the right to exercise this option by bequest or inheritance or otherwise by reason of the death of the Director. 

	4.
	Payment of Purchase Price.  

 Method of Payment.  

Payment
of the purchase price for shares purchased upon exercise of this option shall be made by delivery to the Company of cash or a check to the order of the Company in the amount equal to the
purchase price of such shares, or, in cash received from a broker-dealer to whom the Director has submitted notice together with irrevocable instructions to deliver promptly to the Company the amount
of proceeds from the sale of the shares subject to the stock option, necessary to pay the exercise price. 

	5.
	Delivery of Shares; Compliance with Securities Laws, Etc.

	(a)
	Registration of Option Shares  

No
shares will be issued and delivered upon exercise of any option unless a registration statement under the Securities Act of 1933, as amended, with respect to the shares of Common Stock to be
reserved for issuance upon the exercise of options to be granted under the 2004 Plan has become effective, and unless all other laws and regulations have been complied with. 

	(b)
	Listing, Qualification, Etc.  

This
option shall be subject to the requirement that, if at any time, counsel to the Company shall determine that the listing, registration or qualification of the shares subject hereto upon any
securities exchange or under any state or federal law, or the consent or approval of any governmental or regulatory body, is necessary as a condition of, or in connection with, the issuance or
purchase of shares hereunder, this option may not be exercised, in whole or in part, unless such listing, registration, qualification, consent or approval shall have been effected or obtained on
conditions acceptable to the Board of Directors. Nothing herein shall be deemed to require the Company to apply for or to obtain such listing, registration or qualification. 

	6.
	Nontransferability of Option.  

Stock
Options granted under the Plan, and any rights and privileges pertaining thereto, may not be transferred, assigned, pledged or hypothecated in any manner, or be subject to execution, attachment
or similar process, by operation of law or otherwise, other than: 

In
the case of NSO's: 

Any
NSO granted pursuant to the Plan shall be transferable to any member of such Optionee's "immediate family" (as such term is defined in Rule 16a-1 (c) promulgated by the
Securities and Exchange Commission under the Securities Exchange Act of 1934, as amended, or any successor rule or regulation) or to a trust or family partnership whose beneficiaries are members of
such optionee's "immediate family" or to a qualified charitable organization to which contributions are deductible for tax purposes pursuant to Section 170 of the Internal Revenue Code of 1986,
as amended. 

	7.
	Rights as a Shareholder.  

The
Director shall have no rights as a shareholder with respect to any shares which may be purchased by exercise of this option unless and until a certificate representing such shares is duly 

2

 

issued
and delivered to the Director. No adjustment shall be made for dividends or other rights for which the record date is prior to the date such stock certificate is issued. 

	8.
	Adjustments.

	(a)
	General.  

If,
as a result of a merger, consolidation, sale of all or substantially all of the assets of the Company, reorganization, recapitalization, reclassification, stock dividend, stock split, reverse
stock split or other distribution with respect to the outstanding shares of Common Stock or other securities, the outstanding shares of Common Stock are increased or decreased, or are exchanged for a
different number or kind of shares or other securities, or additional shares or new or different shares or other securities are distributed with respect to such shares of Common Stock or other
securities, an appropriate and proportionate adjustment may be made in (i) the number and kind of shares or other securities subject to this option and (ii) the price for each share
subject to this option, without changing the aggregate purchase price as to which this option remains exercisable. 

	(b)
	Authority to Make Adjustments.  

Adjustments
under this Section 8 will be made by a Committee of the Board of Directors appointed by the Board of Directors, whose determination as to what adjustments, if any, will be made and
the extent thereof will be final, binding and conclusive. No fractional shares will be issued pursuant to this option on account of any such adjustments. 

	(c)
	Limits on Adjustments.  

No
adjustment shall be made under this Section 8 which would, within the meaning of any applicable provision of the Code, constitute a modification, extension or renewal of this option or a
grant of additional benefits to the Director. 

	9.
	Mergers, Etc.  

In
the event of a consolidation or merger in which the Company is not the surviving corporation, or which results in the acquisition of substantially all of the Company's outstanding Common Stock by a
single person, entity or group of persons or entities acting in concert, or in the event of the sale or transfer of all or substantially all of the assets of the Company, or in the event of a
reorganization or liquidation of the Company, prior to the Expiration Date or termination of this option, the Director shall, with respect to this option or any unexercised portion hereof, be entitled
to the rights and benefits, and be subject to the limitations, set forth in Section 9 of the Plan. 

	10.
	Change in Control.  

Notwithstanding
anything to the contrary herein, in the case of a Change in Control of the company, this option granted shall terminate on the later of (i) ninety (90) days after the
occurrence of such Change in Control, and (ii) seven (7) months following the date of grant of each such option, and an option holder shall have the right, commencing at least five
(5) days prior to such Change in Control
and subject to any other limitation on exercise of an option in effect on the date of exercise, to immediately exercise any option in full, without regard to any vesting limitations, to the extent it
shall not have been previously exercised. 

	11.
	Withholding Taxes.  

The
Company's obligation to deliver shares upon the exercise of this option shall be subject to the Director's satisfaction of all applicable federal, state and local income tax withholding
requirements. 

3

 
	12.
	Miscellaneous.

	(a)
	Except
as provided herein, this option may not be amended or otherwise modified unless evidenced in writing and signed by the Company and the Director.

	(b)
	All
notices under this option shall be mailed or delivered by hand to the parties at their respective addresses set forth beneath their names below or at such other address as may be
designated in writing by either of the parties to one another.

	(c)
	This
option shall be governed by and construed in accordance with the laws of the State of Delaware 

Date
of Grant: 

	August 9, 2004	 	ALPHA PRO TECH, LTD.
	

 	
 	

By:	
 	

	

 	
 	

Title:	
 	

	

 	
 	

Address:	
 	

	

 	
 	

 
 

DIRECTOR'S ACCEPTANCE
  (Please sign and return this page to Lloyd Hoffman.)    
    

        The undersigned hereby accepts the foregoing option and agrees to the terms and conditions thereof. The undersigned hereby acknowledges receipt of a copy of the
Company's 2004 Stock Option Plan. 

	 	 	 	 	DIRECTOR
	

DATE:	
 	

	
 	

	

 	
 	

 	
 	

ADDRESS
	

 	
 	

 	
 	

	

 	
 	

 	
 	

4

QuickLinks

Exhibit 4.2

ALPHA PRO TECH, LTD. NON-QUALIFIED STOCK OPTION AGREEMENT FOR NON-EMPLOYEE DIRECTORS

DIRECTOR'S ACCEPTANCE (Please sign and return this page to Lloyd Hoffman.)QuickLinks
 -- Click here to rapidly navigate through this document

 
 

Exhibit 4.3    
    

 
 

ALPHA PRO TECH, LTD.
  NON-QUALIFIED STOCK OPTION AGREEMENT
  FOR NON-EMPLOYEE DIRECTORS    
    

	1.
	Grant of Option.  

Alpha
Pro Tech, Ltd., a Delaware corporation (the "Company"), hereby grants to Robert Isaly (the "Director"), an option, pursuant to the
Company's 2004 Stock Option Plan (the "Plan"), to purchase an aggregate of 15,000 shares of Common Stock, $.01 par value ("Common Stock"), of the
Company at a price of $1.58 per share, purchasable as set forth in and subject to the terms and conditions of this option and the Plan. Except where the
context otherwise requires, the term "Company" shall include the parent and all subsidiaries of the company as defined in Sections 425(e) and 425(f) of the Internal Revenue Code of 1986, as amended
(the "Code"). 

	2.
	Non-qualified Stock Option. ("NSO")  

This
option is not intended to qualify as an incentive stock option within the meaning of Section 422A of the Code. 

	3.
	Exercise of Option and Provisions for Termination.

	(a)
	Exercise Period  

Except
as otherwise provided in this Agreement, this option may be exercised prior to the tenth Anniversary of the date of grant, August 9, 2004,
(hereinafter the "Expiration Date") as to not more than the number of shares and during the period set forth in the table below. The right of exercise shall be cumulative so that if the option is not
exercised to the maximum extent permissible during any exercise period, it shall be exercisable, in whole or in part, with respect to all shares not so purchased at any time prior to the Expiration
Date or the earlier termination of this option. 

	Vesting Schedule
	 	Total No. of Shares Exercisable

	 On or after the first succeeding anniversary of the date of grant of the NSO	 	15,000

This
option may not be exercised at any time on or after the Expiration Date. 

	(b)
	Exercise Procedure  

Subject
to the conditions set forth in this Agreement, this option shall be exercised by the Director's delivery of written notice of exercise to the Chief Financial Officer ("CFO") of the Company,
specifying the number of shares to be purchased and the purchase price to be paid therefore and accompanied by payment in full in accordance with Section 4. Such exercise shall be effective
upon receipt by the CFO of the Company of such written notice together with the required payment. The Director may purchase less than the number of shares covered hereby, provided that no partial
exercise of this option may be for any fractional share or for fewer than ten whole shares. 

	(c)
	Exercise Period Upon Death or Disability  

If
the Director dies or becomes disabled (with the meaning of Section 22(e)(3) of the Code or any successor provision thereto), this option shall be exercisable, within the period of one year
following the date of death or disability of the Director (but in no event after the Expiration Date), by the Director or by the person to whom this option is transferred by will or the laws of
descent and distribution, provided that this option shall be exercisable only to the extent that this option was exercisable by the Director on the date
of his or her death or disability. Except as otherwise indicated by the context, the term "Director", as used in this option, shall 

 

be
deemed to include the estate of the Director or any person who acquires the right to exercise this option by bequest or inheritance or otherwise by reason of the death of the Director. 

	4.
	Payment of Purchase Price.  

 Method of Payment.  

Payment
of the purchase price for shares purchased upon exercise of this option shall be made by delivery to the Company of cash or a check to the order of the Company in the amount equal to the
purchase price of such shares, or, in cash received from a broker-dealer to whom the Director has submitted notice together with irrevocable instructions to deliver promptly to the Company the amount
of proceeds from the sale of the shares subject to the stock option, necessary to pay the exercise price. 

	5.
	Delivery of Shares; Compliance with Securities Laws, Etc.

	(a)
	Registration of Option Shares  

No
shares will be issued and delivered upon exercise of any option unless a registration statement under the Securities Act of 1933, as amended, with respect to the shares of Common Stock to be
reserved for issuance upon the exercise of options to be granted under the 2004 Plan has become effective, and unless all other laws and regulations have been complied with. 

	(b)
	Listing, Qualification, Etc.  

This
option shall be subject to the requirement that, if at any time, counsel to the Company shall determine that the listing, registration or qualification of the shares subject hereto upon any
securities exchange or under any state or federal law, or the consent or approval of any governmental or regulatory body, is necessary as a condition of, or in connection with, the issuance or
purchase of shares hereunder, this option may not be exercised, in whole or in part, unless such listing, registration, qualification, consent or approval shall have been effected or obtained on
conditions acceptable to the Board of Directors. Nothing herein shall be deemed to require the Company to apply for or to obtain such listing, registration or qualification. 

	6.
	Nontransferability of Option.  

Stock
Options granted under the Plan, and any rights and privileges pertaining thereto, may not be transferred, assigned, pledged or hypothecated in any manner, or be subject to execution, attachment
or similar process, by operation of law or otherwise, other than: 

In
the case of NSO's: 

Any
NSO granted pursuant to the Plan shall be transferable to any member of such Optionee's "immediate family" (as such term is defined in Rule 16a-1 (c) promulgated by the
Securities and Exchange Commission under the Securities Exchange Act of 1934, as amended, or any successor rule or regulation) or to a trust or family partnership whose beneficiaries are members of
such optionee's "immediate family" or to a qualified charitable organization to which contributions are deductible for tax purposes pursuant to Section 170 of the Internal Revenue Code of 1986,
as amended. 

	7.
	Rights as a Shareholder.  

The
Director shall have no rights as a shareholder with respect to any shares which may be purchased by exercise of this option unless and until a certificate representing such shares is duly 

2

 

issued
and delivered to the Director. No adjustment shall be made for dividends or other rights for which the record date is prior to the date such stock certificate is issued. 

	8.
	Adjustments.

	(a)
	General.  

If,
as a result of a merger, consolidation, sale of all or substantially all of the assets of the Company, reorganization, recapitalization, reclassification, stock dividend, stock split, reverse
stock split or other distribution with respect to the outstanding shares of Common Stock or other securities, the outstanding shares of Common Stock are increased or decreased, or are exchanged for a
different number or kind of shares or other securities, or additional shares or new or different shares or other securities are distributed with respect to such shares of Common Stock or other
securities, an appropriate and proportionate adjustment may be made in (i) the number and kind of shares or other securities subject to this option and (ii) the price for each share
subject to this option, without changing the aggregate purchase price as to which this option remains exercisable. 

	(b)
	Authority to Make Adjustments.  

Adjustments
under this Section 8 will be made by a Committee of the Board of Directors appointed by the Board of Directors, whose determination as to what adjustments, if any, will be made and
the extent thereof will be final, binding and conclusive. No fractional shares will be issued pursuant to this option on account of any such adjustments. 

	(c)
	Limits on Adjustments.  

No
adjustment shall be made under this Section 8 which would, within the meaning of any applicable provision of the Code, constitute a modification, extension or renewal of this option or a
grant of additional benefits to the Director. 

	9.
	Mergers, Etc.  

In
the event of a consolidation or merger in which the Company is not the surviving corporation, or which results in the acquisition of substantially all of the Company's outstanding Common Stock by a
single person, entity or group of persons or entities acting in concert, or in the event of the sale or transfer of all or substantially all of the assets of the Company, or in the event of a
reorganization or liquidation of the Company, prior to the Expiration Date or termination of this option, the Director shall, with respect to this option or any unexercised portion hereof, be entitled
to the rights and benefits, and be subject to the limitations, set forth in Section 9 of the Plan. 

	10.
	Change in Control.  

Notwithstanding
anything to the contrary herein, in the case of a Change in Control of the company, this option granted shall terminate on the later of (i) ninety (90) days after the
occurrence of such Change in Control, and (ii) seven (7) months following the date of grant of each such option, and an option holder shall have the right, commencing at least five
(5) days prior to such Change in Control and subject to any other limitation on exercise of an option in effect on the date of exercise, to
immediately exercise any option in full, without regard to any vesting limitations, to the extent it shall not have been previously exercised. 

	11.
	Withholding Taxes.  

The
Company's obligation to deliver shares upon the exercise of this option shall be subject to the Director's satisfaction of all applicable federal, state and local income tax withholding
requirements. 

3

 
	12.
	Miscellaneous.

	(a)
	Except
as provided herein, this option may not be amended or otherwise modified unless evidenced in writing and signed by the Company and the Director.

	(b)
	All
notices under this option shall be mailed or delivered by hand to the parties at their respective addresses set forth beneath their names below or at such other address as may be
designated in writing by either of the parties to one another.

	(c)
	This
option shall be governed by and construed in accordance with the laws of the State of Delaware 

	Date of Grant:	 	 	 	 
	

August 9, 2004	
 	

ALPHA PRO TECH, LTD.
	

    	
 	

By:	
 	

 
	    	 	 	 	

	    	 	Title:    	 	    
	    	 	    	 	

	    	 	Address:	 	    
	    	 	    	 	

	    	 	 	 	 
	    	 	

4

 
 
 

DIRECTOR'S ACCEPTANCE
  (Please sign and return this page to Lloyd Hoffman.)    
    

        The undersigned hereby accepts the foregoing option and agrees to the terms and conditions thereof. The undersigned hereby acknowledges receipt of a copy of the
Company's 2004 Stock Option Plan. 

	 
	 	 
	 	 

	 	 	 	 	DIRECTOR
	

DATE:	
 	

 	
 	

 
	 	 	
	 	

	

 	
 	

 	
 	

ADDRESS
	

 	
 	

 	
 	

	

 	
 	

 	
 	

5

QuickLinks

Exhibit 4.3

ALPHA PRO TECH, LTD. NON-QUALIFIED STOCK OPTION AGREEMENT FOR NON-EMPLOYEE DIRECTORS

DIRECTOR'S ACCEPTANCE (Please sign and return this page to Lloyd Hoffman.)

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