3M Scotch 845 Book Tape [Discontinued]
Before ordering, please read the "Product Description & Specs" tab content for more information about this item.
Please note 3M has discontinued this tape and only limited inventory now remains. Please see the Related Products section below for alternatives.
3M 845 Book Tape is a tough crystal-clear transparent tape with a long-aging, synthetic adhesive that conforms readily to book contours and flexes with cover movements. Excellent for repairing, reinforcing, protecting and covering bound edges and surfaces. Use on books, magazines, pamphlets, record album jackets and more. The transparent polypropylene backing has excellent clarity which doesn't hide title information or printing and saves time and money by eliminating relabeling. It is tough, flexible, resists abrasion and cracking, and is conformable which reduces rebinding or replacement costs. Its synthetic archival adhesive is long aging and will not discolor or dry out so it won't deteriorate with time causing possible subsequent repair. Made in the U.S.
3M Scotch 845 Book Tape
- Carrier/Backing: polypropylene (PP) film
- Adhesive: synthetic How are adhesives different?
- Thickness: 3.4 mils (carrier, adhesive) What is mil thickness?
- Adhesion: 30 ounces per inch (to stainless steel test panel)
- Tensile Strength: 45 pounds per inch (longitudinal)
- Elongation: 120%
- Core: 3" diameter
Note: Specifications are those given by manufacturers and are not tested for accuracy.
Please note that tape rolls are NOT guaranteed to be splice-free. Tape rolls are typically cut to standard tape industry metric-cut sizes - or approx 5% narrower than the nominal size (i.e. 24mm per 1-inch of nominal width ordered).
845 Standard sizes
|ROLL SIZE||ITEM #
||ROLLS PER CASE
||PRICE PER ROLL
||PRICE PER CASE
1-1/2 in. x 15 yds.
Actual Size: 36mm x 13.7m
Single Roll (1-23 Rolls)
1 - 4 Cases (24-119 Rolls)
5 - 9 Cases (120-239 Rolls)
10+ Cases (>= 240 Rolls)
Nominal Tape Widths vs Actual Widths
5% narrower than the NOMINAL width shown in inches. Examples:
Tape rolls are cut to standard tape industry metric widths of approx. 24mm per 1-inch of nominal width ordered. As a result ACTUAL tape widths are normally
- 1" Nominal width = 15/16" (24mm) Actual width
- 2" Nominal width = 1-7/8" (48mm) Actual width
- 3" Nominal width = 2-13/16" (72mm) Actual width
Note that tape rolls are NOT guaranteed to be splice-free.
Question & Answers
[ viewing questions 1 through 3 of 3 total ]
Customer Nov 30, 2017
QUESTION: How thick is it?
ANSWER: Thickness is 3.4 mils (carrier, adhesive).
Customer Jun 20, 2017
QUESTION: Would you recommend this tape to fix broken seams on a folding board game?
ANSWER: Yes it would perfect for that.
Customer Mar 22, 2017
QUESTION: Can you tell me the differences between this tape and regular packing tape?
ANSWER: This book tape is acid free and regular packing tape is not. This is important because over time the acid in regular tape will cause the paper in a book to deteriorate. This book tape does not crack and peel and curl over time which would ultimately damage the book, like regular packing tape will. Book tape protects the book over time.
hot melt rubber (synthetic)
Offers the widest range of application flexibility available. Exhibits excellent processing performance whether manually or automatically applied. Has superior tensile strength, adhesion properties and holding force which ensures consistent, reliable seals. Hot melt adhesive will bond faster to a surface which is referred to as quick-grab or quick-stick. It typically has higher tack (will feel stickier to the touch), but is also softer. It has lower heat resistance, shear resistance, and sometimes UV resistance than an acrylic adhesive. NOTE: it is called hot melt because the adhesive is applied hot by the manufacturer and then hardens as it cools (you do not need to apply heat to the tape yourself).
Properties are similar to that of hot melt rubber, but natural rubber often holds where other adhesives won't (recycled fibers, dust, cold, heat and heavy loads). It provides good overall adhesion and moisture resistance.
Offer excellent performance, especially for applications in temperatures less than 40°F and greater then 120°F. It provides excellent clarity, has high shear strength, is usually more permanent/durable even when exposed to moisture, and it ages well over extended periods in fluorescent and sunlight. Since it remains clear for the life of the application and does not yellow over time it is ideal for applications such as sealing white cartons. While it has good initial adhesion it does take 24-48 hours to cure and to achieve its maximum bond strength (has gradual adhesion buildup). Another difference between hot melt rubber and acrylic adhesive is if you fold tape over making the two adhesive sides touch the acrylic adhesive will remain attached to the carrier (e.g. paper, film) while a hot melt adhesive will stick to itself and pull off of the carrier. It is the best choice for clarity, UV resistance and aging characteristics.
Is great for extreme temperature applications since silicone adhesive can work in continuous operating temperatures from -100°F to 500°F. They also exhibit good chemical resistance, retain electrical properties, and remove cleanly with little or no residue.
Zinc oxide based adhesive formula is a skin-friendly adhesive which is commonly used on sports medicine tapes.
Thickness, AKA caliper or gauge, refers to the distance from one surface of a tape backing, or adhesive, to the other.
1 mil = 1/1000 of an inch
Examples: 1/16 inch = 62.5 mils; 1/32 inch = 31.25 mils