and kenaf can be used in the kraft process. Qualities Normal kraft paper is strong and relatively coarse. It has high tensile strength. The grammage is normally 40–135 g/m2. Sack kraft paper, or just sack paper, is a porous kraft paper with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability. Absorbent kraft paper is made with controlled absorbency (i.e. a high degree of porosity). It is made of clean low kappa hardwood kraft and has to have a good uniformity and formation. Spinning kraft paper is an especially strong type of kraft paper with relatively low grammage (40 g/m2). This paper requires the best possible machine direction strength and cross machine elongation. This is done by high fiber orientation on the paper machine. Hunting cartridge paper is a kraft paper used in shotgun shells. This paper needs a high tensile strength in the machine direction, which is the axial direction of the cartridges. In the cross direction, the cartridge is supported by the gun-pipe, but a sufficient elongation is needed. The body of the cartridge is wound of a kraft paper of 80–120 g/m2, which is further covered by an outer sheet of 60–80 g/m2 with colour and printing. Candy wrapping paper and twisting paper are thin 30–40 g/m2 kraft papers and are mostly flexo or offset printed. These papers require a good strength, with highly oriented fibers. Twisting paper is mostly opaque and often supercalendered. Applications As a plastic-hazard-free paper in paper sacks for cement, food, chemicals, consumer goods, flour bags etc. Electrical insulation in large oil-filled transformers Paper grocery bags, multiwall sacks, envelopes and other packaging An inexpensive material for lining particle boards The base paper for sandpaper As wrapping for flower bouquets In World War II, for fabricating drop tanks As a wrapping for the French dish Gigot bitume, which consists of a leg of lamb wrapped in Kraft paper and cooked in hot asphalt See also Butcher paper Corrugated fiberboard Gift wrapping Manila paper Paper bag Paper sack Parchment paper References Yam, K. L., Encyclopedia of Packaging Technology, John Wiley & Sons, 2009, External links What is The True Difference Between Kraft Paper and Butcher Paper? Paper Packaging materials