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Closure Types

Promotional Mailers

If the mailer is being prepared so that automated mailing rates can be used, the size of the mailer must fit the Letter and Card size specifications, and the open edge of the mailer must be sealed by some method. The type of closures available are tabs, wafer seals, tape, line glue and spot glue. Staples should not be used because they can cause damage to the automated mail processing equipment. Shown below are some of the closure types and the specifications that need to be followed to qualify for automated mailing rates. The specifications need to be followed to allow the mailer to run properly through the automated mail processing equipment.

Tab/Wafer Seals


 

TYPE OF MAILER
Double Postcard Size
Folded Mailer - Single Sheet
Folded Mailer - Multiple Sheets
Right Fold Mailer

MIN. PAPER WT.
75 lb.
28 lb.
24 lb.
75 lb.

FOLD LOCATION
Top or Bottom
Bottom
Bottom
Right

 
Note: If the mailer has a business reply card, the paper weight will have to meet
the postal requirements for business reply mail.


 

TYPE OF MAILER
Folded Mailer - Single Sheet
Folded Mailer - Multiple Sheets

MIN. PAPER WT.
20 lb.
20 lb.

FOLD LOCATION
Top or Bottom
Top or Bottom

 
Note: If the mailer has a business reply card, the paper weight will have to meet
the postal requirements for business reply mail.

Note: When placing tabs/wafer seal on the mailer, be sure they do not interfere with the facing identification mark, rate marking, return address, delivery address and bar code. If they are placed in the bar code clear zone they must meet the paper standards an ink acceptance standards set up by the USPS, unless the bar code is in the address block.
See www.usps.gov for complete details.



Gluing

When using glue to seal the mailer, it should be glued at the top and the fold should be at the bottom when viewed from delivery address side. Paper stock should be a minimum weight of 20 lb. Note: If the mailer has a business reply card, the paper weight will have to meet the postal requirements for business reply mail.

There are several different glue types available that can be used to seal the mailer. The type you use will depend on how strong the seal must be and how easily you want the mailer to open. It will also depend on your manufacturer's capabilities.

 

Standard continuous line gluing would be a permanent type glue that is going to provide a strong hold. When it is pulled apart it may cause damage to the paper. A fugitive type glue can also be used that will do a good job of sealing the mailer and pulls apart more easily, causing less damage to the paper. 

 

 
Spot gluing can also be accomplished using permanent or fugitive glue. Both types will open easier than the continuous line glue because of less glue coverage. Another type of spot glue that is used is a tacky glue dot that pulls apart easily and has some resealing properties.
 

Cellophane Tape

Tape can be used to seal the open edge of your mailer but it may not be used in the bar code clear zone.

Note: If the mailer fits the size specifications for Flats, you are not required to use any type of closure. The mailers can be sealed with closure types shown above as long as they do not interfere with the facing identification mark, rate marking, return address, delivery address and bar code.

 
For complete details on all mailing specifications, see www.usps.gov.


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