Shredded cheese starts as large blocks of cheese that are cooled, cut into uniform strips by high-speed industrial blades, coated with anticaking agents to prevent clumping, and sealed in gas-flushed bags to stay fresh. The process is more involved than it looks, and every step exists to solve a specific problem: keeping shreds separate, preventing mold, and maintaining texture from the factory to your kitchen.
It Starts With Cold Cheese Blocks
Cheese destined for shredding is made the same way as any block cheese. Milk is cultured, coagulated, pressed into blocks, and aged to the desired flavor profile. What matters for shredding is what happens next: the blocks need to be firm enough to hold their shape when they hit the blades.
Temperature is critical. Warm cheese is soft and sticky, which causes it to smear and clump rather than forming clean shreds. Manufacturers chill blocks to near-freezing temperatures before shredding. Fat and moisture content also determine how well a cheese shreds. Low-moisture mozzarella, for example, is required to have moisture between 45% and 52%, a range that keeps the cheese pliable enough to cut cleanly but firm enough not to fall apart. Cheeses with too much moisture turn mushy under the blades, while overly dry cheese crumbles into dust.
How the Shredding Machines Work
Industrial shredding uses rotating drums or disc-style cutting heads fitted with sharp blades. Chilled cheese blocks are fed into the machine, where they’re pressed against the cutting surface. The blade configuration determines the final shred size. For standard shredded cheddar, USDA specifications require shreds no larger than 3/16 of an inch in height and width. Finer shreds, like those used for pizza blends, can be 1/16 of an inch or smaller.
Speed and blade sharpness matter because dull blades generate friction and heat, which softens the cheese and creates “fines,” the tiny crumbs and dust that settle at the bottom of the bag. USDA standards cap fines at no more than 6% of the total weight. Manufacturers test this by passing shreds through standardized sieves: a coarser sieve for larger shreds, a finer one for smaller cuts. The finished shreds should be free-flowing, not matted together, with a uniform color and an attractive sheen.
What Gets Added After Shredding
If you’ve ever wondered why homemade shredded cheese clumps together while store-bought stays loose, the answer is anticaking agents. These are powders dusted onto the shreds immediately after cutting, and they serve two purposes: absorbing surface moisture and physically separating the strands so they pour freely out of the bag.
The most common anticaking agents are potato starch, cellulose (a plant-derived fiber), corn starch, and calcium sulfate, used alone or in blends. A typical combination might be 80% potato starch with 20% cellulose, or a three-part blend of potato starch, corn starch, and calcium sulfate. These coatings are applied at concentrations between 1% and 5% of the cheese’s weight. The FDA allows up to 4% cellulose specifically. At those levels, most people can’t taste or feel the difference, though higher concentrations can leave a slightly powdery mouthfeel and affect how the cheese melts.
You’ll also find natamycin on most ingredient labels. This is a naturally derived antifungal compound that prevents mold growth on the exposed surfaces of the shreds. Shredded cheese has far more surface area than a solid block, which makes it much more vulnerable to mold. Natamycin works by binding to a specific component in fungal cell membranes, disrupting the membrane and stopping mold and yeast from growing. It’s effective at very low concentrations. In the U.S., the maximum permitted level in cheese is 40 parts per million. It can be applied by spraying, dipping, or mixing into a coating along with the anticaking agents.
Packaging Keeps It Fresh
Once coated, the shreds are immediately packaged in bags that have been flushed with a modified atmosphere. This means the regular air inside the bag (which contains oxygen that promotes mold growth and causes fats to go rancid) is replaced with either 100% carbon dioxide, 100% nitrogen, or a blend of both. Carbon dioxide actively inhibits bacterial and mold growth, while nitrogen acts as an inert filler that keeps the bag puffy and protects the shreds from being crushed.
The bags themselves are designed to block light. Fluorescent light, the kind found in grocery store display cases, breaks down fats in cheese and produces off-flavors while fading the color. That’s why most shredded cheese bags are opaque or have only a small clear window. After sealing, the bags are stored and shipped at refrigerator temperatures, typically around 40°F (4°C). With the combination of anticaking agents, natamycin, and modified atmosphere packaging, commercial shredded cheese stays fresh for several weeks.
Why Pre-Shredded Cheese Melts Differently
The anticaking coatings that keep shreds from clumping also affect melting. Starches and cellulose absorb moisture and create a thin barrier around each strand of cheese. When you heat pre-shredded cheese, those coatings slow the strands from fusing into a smooth, cohesive pool. This is why recipes that call for a silky cheese sauce often recommend buying a block and grating it yourself. The difference is especially noticeable in dishes like mac and cheese or fondue, where you want the cheese to melt into a uniform liquid.
For pizza, quesadillas, or casseroles where you want the cheese to melt but still hold some texture, pre-shredded works just fine. The coating also helps it brown slightly more evenly on top, since the separated strands create more surface area exposed to direct heat.
Quality Differences Between Brands
Not all shredded cheese is created equal. USDA-graded shredded cheddar must meet the flavor requirements of U.S. Grade A or better, meaning the base cheese itself has to pass a quality threshold before it’s ever shredded. But the grading system also evaluates the physical characteristics of the shreds: uniformity of size, color consistency, free-flowing texture, and minimal fines.
Cheaper brands sometimes use higher percentages of anticaking agents, which can dull the cheese flavor and create a chalky texture. Reading the ingredient list gives you a rough sense of quality. A short list (cheese, a single anticaking agent, natamycin) generally signals a more straightforward product. Blends that list multiple starches, added flavors, or colors may be compensating for lower-quality base cheese. If the package lists the cheese variety and specifies something like “aged 60 days” or “sharp,” the manufacturer is more likely using a cheese that could stand on its own as a block.