There are 3 different kinds of seals these are: Gummed; Press Seal and Peel & Seal.
Gummed:
Gummed envelopes are one of the first types of adhesive seal to have been created and are still widely used today. The first method used for sealing envelopes was a wax seal. It was 50 years after the first envelope making machine was created (back in 1845) before a commercially successful machine for producing pre-gummed envelopes was created. The gum you find on envelopes today is a water soluble gum and the most common sealing method. To activate the adhesion process you must moisten the layer of adhesive along the envelope flap, this then allows the gum to glue the flap closed. When stored correctly, gummed envelopes will last for a number of years. The gum is made using a blend of synthetic resin and dextrin and so is completely biodegradable.
Press Seal or Latex Seal:
Press and Seal envelopes are another of the most popular sealing methods. They eradicate the need for moistening the flap and practically do all the work themselves. All you have to do is apply the two ‘glued’ flaps together. These envelopes have a strip of latex on each flap so that when they are pressed together, they form an instant bond. Bear in mind when purchasing these envelopes that they have a shelf life of approximately 1 year, so only purchase as many as you think you will use in that time, veering on the side of caution. Having said this, if they are stored right they may last you a little longer. You will find security slits on the flap of peel and seal envelopes which causes the flap to rip in the event of the envelope being tampered with once sealed.
Peel and Seal:
The peel ans seal envelope (also known as Quick Stik, strip seal and peel & stick) is up there in the top most secure ways to seal an envelope. You simply peel away the strip which protects the latex adhesive and press down to form an instant bond. These envelopes have a longer shelf life and almost act as a tamper proof security seal as they are almost impossible to open unless the flap is torn. Using a peel and seal flap envelopes makes sealing quick and easy. No more licking the gummed edge, just simply peal back the strip and seal from the envelope.
Catalog Sizes:
Catalog Envelopes 4"x6-3/8" 24lb white wove paper stock
Catalog Envelopes 4-5/8"x6-3/4" 24lb white wove paper stock
Catalog Envelopes 5"x7-1/2" 24lb white wove paper stock
Catalog Envelopes 5-1/2"x7-1/2" 24lb white wove paper stock
Catalog Envelopes 5-1/2"x8-1/4" 24lb white wove paper stock
Catalog Envelopes 6"x9" 24lb white wove paper stock
Catalog Envelopes 6-1/2"x9-1/2" 24lb white wove paper stock
Catalog Envelopes 7"x10" 28lb white wove paper stock
Catalog Envelopes 7-1/2"x10-1/2" 28lb white wove paper stock
Catalog Envelopes 8-3/4"x11-1/4" 28lb white wove paper stock
Catalog Envelopes 9"x12" 28lb white wove paper stock
Catalog Envelopes 9-1/2"x12-1/2" 28lb white wove paper stock
Catalog Envelopes 10"x13" 28lb white wove paper stock
Catalog Envelopes 10"x15" 28lb white wove paper stock
Catalog Envelopes 11-1/2"x14-1/2" 28lb white wove paper stock
Catalog Envelopes 12"x15-1/2" 28lb white wove paper stock
Booklet Sizes:
Booklet Envelopes 4-3/4"x6-1/2", 24lb white wove paper stock
Booklet Envelopes 5-1/2"x7-1/2", 24lb white wove paper stock
Booklet Envelopes 5-1/2"x8-1/8", 24lb white wove paper stock
Booklet Envelopes 5-3/4"x8-7/8", 24lb white wove paper stock
Booklet Envelopes 6"x9", 24lb white wove paper stock
Booklet Envelopes 6"x9-1/2", 24lb white wove paper stock
Booklet Envelopes 6-1/2"x9-1/2", 24lb white wove paper stock
Booklet Envelopes 7"x10", 28lb white wove paper stock
Booklet Envelopes 7-1/2"x10-1/2", 28lb white wove paper stock
Booklet Envelopes 8-3/4"x11-1/2", 28lb white wove paper stock
Booklet Envelopes 9"x12", 28lb white wove paper stock
Booklet Envelopes 9-1/2"x12-5/8", 28lb white wove paper stock
Booklet Envelopes 10"x13", 28lb white wove paper stock
These open end envelopes are available with a metal clasp for content protection. Not suitable for automatic insertion. A clasp envelope content can be easily inserted or accessed by hand.
Also available in 28 lb. Gray Kraft and 24 lb./28 lb. Brown Kraft
Paper is often characterized by weight. In the United States, the weight assigned to a paper is the weight of a ream, 500 sheets, of varying "basic sizes", before the paper is cut into the size it is sold to end customers. For example, a ream of 20 lb, 8.5 in × 11 in (216 mm × 279 mm) paper weighs 5 pounds, because it has been cut from a larger sheet into four pieces. In the United States, printing paper is generally 20 lb, 24 lb, or 32 lb at most.
