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Microcrystalline Cellulose Colloidal Silica Co Treated Material BP EP USP Pharma Grade: A Commentary

Historical Development

Decades ago, pharmacists ran into trouble keeping active ingredients together in tablets without relying on unpredictable binders. They moved past simple powders and starches, chasing greater stability and performance. Microcrystalline cellulose (MCC) came out of wood pulp processing and started changing the game for direct compression in pharmaceuticals by the early 1960s. Colloidal silica, with its flow-enhancing knack, had found its place by then, too. Blending these two didn’t happen by accident—it grew as a direct answer to faster production demands, picky drugs, and a need for tight quality control. Pharmacopoeial standards like BP, EP, and USP keep pushing manufacturers to tighten up their act every year, making this blend a foundation rather than an option for modern drug formulation.

Product Overview

This product, a blend of microcrystalline cellulose with colloidal silica, shows up as a white, free-flowing powder. Drug makers lean on it when they're looking for consistent pill quality from batch to batch. It behaves predictably under pressure, giving tablets a tough profile without caving under stress or breaking apart in storage. Medicine crafters stick with this because it offers more than routine binders ever did. They target it for moisture-sensitive APIs and tablets where crumbling or sticking jams up their presses. The BP, EP, and USP tags mean it has cleared demanding tests for inclusion in drugs sold worldwide, giving teams peace of mind on multinational batches.

Physical & Chemical Properties

Microcrystalline cellulose stands out because it resists reacting with APIs and delivers unmatched compressibility. It keeps its particle structure through tough mixing routines. Colloidal silica comes in as a helper, easing powder flow, trimming down static, and keeping ingredients from clumping. This blended material runs dry, feels a little gritty, holds no scent or taste, and won’t break down if you leave it sitting exposed to air for a season or two. Manufacturers measure it for bulk density, moisture, and trace residues—each value falling in a tight range, or else the batch won’t get past QC. Low water content gives it a long shelf life, and the minimal heavy metal or microbial count keeps it safe every step from plant to bottle.

Technical Specifications & Labeling

Labeling keeps things honest for this material. You’ll see full ingredient lists, batch codes, compliance notices with the latest pharmacopeias, and suggested storage. Teams keep an eye on pH range, loss on drying, particle size distribution, and specific surface area, as these set the stage for how it performs in tablets. If you peel back an actual lab report, there’s no hiding; any off-spec value could point to risks for finished drug durability, so strong traceability remains baked in. The product’s labeling regularly warns to seal containers tight, stay clear of high humidity, and use personal protective measures—standard for safe handling, but often overlooked until a problem flares.

Preparation Method

Preparation isn’t a simple matter of stirring powders together. MCC often starts with wood pulp, getting treated with mineral acid and then neutralized until only pure cellulose stands. Technicians dry and mill it for uniform particle sizes, a tough job when consistency runs the show. Colloidal silica gets blended in next, sometimes with high-speed mixing, to spread these tiny particles across the cellulose. This boosts flow without leaving gritty pockets behind. Quality inspectors keep microscopes and particle counters close by, since a weak blend spells trouble for downstream compression. Any shortcut at this step risks tablets with split layers or uneven drug distribution—mistakes that echo out to patients and regulators both.

Chemical Reactions & Modifications

While MCC shows little chemical activity, some research teams explore surface modifications to tweak binding properties or water uptake. Colloidal silica, being basically inert silicon dioxide, doesn’t bring much drama to the mix. That’s critical, because high-tech APIs hate unwanted reactivity. Some custom batches might carry extra surface treatment—maybe to boost lubricant incorporation or help sticky compounds behave at the press. Teams walk a tightrope during modification; subtle surface tweaks make a difference, but stray too far and the blend may lose the properties that made it so reliable in the first place.

Synonyms & Product Names

This co-processed blend travels the world under a roster of technical names. Pharmacopeias list it as “Microcrystalline Cellulose and Colloidal Silicon Dioxide Co-processed” or compacted, co-milled grades. Leading brands roll out trademark names like Avicel® or Vivapur®, adding further specialty codes for particle size and silica ratio. Research chemists sometimes call it MCC-silica blend, or simply refer to a specific code number in documentation. All flavors point back to the base expectation: consistent quality and performance where the label matches reality.

Safety & Operational Standards

Handling this material rightly means working with goggles, dust masks, and gloves in plant rooms set up for subtle dust control. Spillage or lax hygiene can irritate lungs, and silica’s tiny size lets it float farther than most expect. GMP rules spell out procedures for weighing, transfer, blending, and storage. Facilities run routine training for workers to keep everyone alert to the risks. Storage guidelines direct teams to keep it dry and cool, avoiding sunlight or open air, and to rotate stock on a first-in-first-out basis to keep old batches away from production lines.

Application Area

Pharmaceutical teams use this co-processed material in a host of solid dosage forms. It’s a regular in high-speed direct compression runs, chewable tablets, and even orodispersible pills where mouthfeel matters. Drug developers target it for medicines with awkward active compounds, complex blends, and moisture worries. Nutraceutical companies also claim a share, building it into vitamins and dietary supplements. This blend shrugs off variations that used to derail production—one reason it has become a staple for high-value, high-volume tablet runs across the globe.

Research & Development

R&D scientists keep looking for ways to stretch this material’s skillset. Universities run studies on its behavior in combination with oddball actives, like biotech peptides or poorly water-soluble drugs. Some teams test newer silica ratios, seeing if they can cut dust or trim production times. Drug manufacturers partner with specialty suppliers to experiment with co-processed excipient lines that target both solubility and stability in one move. Many breakthroughs in novel tablet forms, including 3D-printed pills or immediate-onset dosage forms, started by pushing the boundaries of MCC-silica blends.

Toxicity Research

Safety data for both MCC and colloidal silica go back decades, but new regulatory scrutiny keeps them under the microscope. Oral toxicity research hasn’t found worrying results at normal pharmaceutical doses, but chronic exposure in manufacturing creates a need for careful handling protocols. Studies check for allergenicity, reactivity, and the smallest chance of bioaccumulation. Regulatory agencies demand regular updates on results from animal studies, batch toxicity tests, and real-world post-market surveillance. Patient safety hinges on vigilance—no matter how familiar a substance might look.

Future Prospects

With medicine pressing toward personalized solutions, this blend could show up in even more flexible, modular tablet systems. Specialty pharma eyes it for improved controlled-release forms and tablets that survive tough tropical climates. Researchers lean into greener preparation methods, hunting for wood pulp alternatives or ways to lower energy use in manufacturing. As regulatory bodies keep raising the bar for excipient quality, supply-chain transparency and more rigorous in-process testing look ready to shake things up. The next breakthrough isn’t just in APIs, but in materials like this—every innovation here opens new options for formulating drugs, making therapies safer, faster, and more accessible.




What is Microcrystalline Cellulose Colloidal Silica Co Treated Material BP EP USP Pharma Grade used for?

What’s the Practical Role of This Material?

Microcrystalline cellulose blended with colloidal silica sounds technical, but at its core, it helps in making tablets—the kind you get from your local pharmacy—more reliable. I’ve handled these materials in a hands-on way; their texture reminds me of soft, powdery chalk, and their behavior on the production line shapes the products we use for our health.

Tablets need to be strong enough to survive shipping, but they also should break apart quickly when you swallow them. Microcrystalline cellulose gives tablets the strength to stay in one piece as they rattle through machines and tumble into bottles. Drop a loose batch of powder into a machine, and without something holding it together, you end up with broken pieces or chalky dust. This is where microcrystalline cellulose steps in. It acts like glue but without any sticky residue, holding everything together.

Why Colloidal Silica Matters

Colloidal silica works as a helper. This fine, sand-like powder keeps things from sticking to machinery. Walk through any tablet-making facility and you see machines built to manage speed and precision. I’ve watched those machines jam up whenever moisture or powder builds up on moving parts. Those delays cost money and put the schedule at risk. The addition of colloidal silica makes the powder flow better, moving smoothly from one hopper to the next, which reduces downtime and keeps production steady.

Pharma Grade and Patient Safety

BP, EP, and USP refer to pharmaceutical standards that control everything from purity to safety in medicines for markets worldwide. Materials meeting these grades have to earn their place by passing batches of tough tests—cleanliness, trace metals, anything else that could tip the balance of safety. In my work with quality teams, missing even one target meant scrapping expensive batches. The trust behind a “pharma grade” label comes from hundreds of hours spent testing and double-checking results long before the product sees daylight.

Current Challenges

One issue that’s come up again and again: supply chain disruption. These days, one broken link in storage or shipping can throw off production schedules at factories. If there’s a shortage of quality-controlled microcrystalline cellulose or colloidal silica, production lines grind to a halt. People end up waiting for their medicine, or sometimes pharmacies can’t keep their shelves stocked.

Manufacturers often depend on a small group of suppliers who meet these exacting standards, which makes the whole system fragile. As someone who’s planned mild workarounds, I’ve seen how crucial it is to secure contracts with more than one supplier. Engineers and procurement folks might feel squeezed by price, but the risk of cutting corners or settling for untested grades isn’t worth it.

Looking Ahead

Building a more robust pipeline involves close partnerships between manufacturers, suppliers, and regulatory bodies. Strict oversight weighs heavily on each batch, but nobody wants to risk unsafe medicine in circulation. Sustainable sourcing and closer collaboration among regional suppliers could relieve some pressure, especially during peak demand or shortages. If you’ve ever spent time onsite at a tablet-manufacturing plant, you see firsthand how these seemingly simple powders form the foundation of the world’s medicine supply.

What are the advantages of using co-treated microcrystalline cellulose and colloidal silica in pharmaceuticals?

Why This Combination Matters

A good tablet is more than just medicine; it’s a delivery promise. Co-treated microcrystalline cellulose and colloidal silica help keep that promise by turning formulation headaches into smooth runs. In decades of handling pharmaceutical powders, I’ve seen how tough it is to keep a tablet consistent. One batch runs fine, then moisture creeps in, or a new batch of actives turns sticky. Even minor changes can throw everything off.

Combining microcrystalline cellulose—known for tough, fibrous bulk—with colloidal silica feels a bit like seasoning cast iron pans. It’s not flashy, but it solves problems the naked eye misses. Microcrystalline cellulose has always stood out for keeping tablets together and acting as a sturdy backbone. Add colloidal silica and suddenly, the powder flows better, less sticks to equipment, and tablets keep their shape under pressure.

Tangible Benefits for Consistent Manufacturing

I remember a time a team struggled with a pain-relief tablet. Powders jammed feeders, and the operator spent more time cleaning than producing. We switched from standard cellulose to a blend co-treated with silica. The difference was clear. No more arching or clogging at the hopper. Tablets pressed faster and losses dropped. The cost of downtime and wasted material shrank.

The real-world value comes from smoother production. Even fast, modern lines can trip over powders that clump or bridge. Colloidal silica acts as a slick buffer—think fine sand sprinkled onto a shuffleboard. The cellulose keeps its familiar binding activity, so tablets stay hard, but each granule dances better through the machinery.

Quality Where It Matters

In my years consulting with small- to mid-size pharmaceutical outfits, I noticed quality complaints drop when they switched to this blend. Less dust meant less cleanup and more product in bottles. Tablets broke less during packaging. People forget that for patients, a crumbling tablet can mean missed doses. For companies, it means recalls or lost trust.

Co-treated powders also stretch formulas that barely pass tests. An older antihistamine used to crumble during storage. With the new excipient blend, tablets stayed solid for the full shelf-life. Studies support this, showing fewer weight and hardness variations per batch. This is not just a trick in the lab—patients get more reliable medicine, and pharmacists spend less time explaining breakage to anxious customers.

Solving Problems for the Real World

Tablets have to adjust to shifts in temperature, moisture, and handling. Standard cellulose struggles in high humidity, turning tablets soft or sticky. Colloidal silica shields the powder from taking on water, acting almost like a raincoat. This helps stability, especially in monsoon-prone regions or warehouses without perfect air conditioning.

Getting powders to work together saves time and money. Instead of adding flow agents or binders separately, a single blend takes care of both. It cuts down on ordering, storage space, and mixing steps; this matters for smaller factories chasing tight margins. Larger companies gain room for automation.

Patients rarely read about these changes, but pharmacists and machine operators see the difference. Tablets that don’t crack, a quieter line without alarms, batches that pass release tests on the first try—these are the signs things are working better. In the end, choosing the right excipient blend lifts the quality bar for everyone.

Is Microcrystalline Cellulose Colloidal Silica Co Treated Material compliant with BP, EP, and USP standards?

Why Standards Matter

Anyone using or making tablets in the pharmaceutical world will recognize microcrystalline cellulose, often blended with a bit of colloidal silica to help tablets hold shape and resist sticking. With all eyes on quality and safety, it doesn’t matter if the plant runs in India, Europe, or the U.S.—those three big sets of standards (British Pharmacopoeia, European Pharmacopoeia, and United States Pharmacopeia) set the bar for what’s allowed and what’s not.

You find both big and small firms sweating over whether the mixture passes the test. Doctors and pharmacists count on that green light—otherwise, their faith in medicine falls apart fast. Watching recalls or warning letters pop up usually circles back to someone cut corners or missed a small change during production.

What BP, EP, and USP Inspect

Each of these pharmacopeias gets pretty exact. BP, EP, and USP list what to look for: purity, residue on ignition, water content, acid-insoluble material, and so on. They don’t just glance at the final powder and call it a day. The rules extend to identification tests, microbial limits, and possible residues from added colloidal silica. Sometimes limits shift between one region and the next; for instance, water content measured by loss on drying can land in a slightly different range country to country. But if a plant’s material ticks every box, regulators say it’s good to go for medicine.

Some manufacturers try cutting production cost by adding a touch more silica, hoping for better flow. The flip side: too much can bump the powder outside permissible limits, and no reputable pharmaceutical company risks a failed audit. Process control isn’t just a buzzword, it means hired experts pore over certificates of analysis and tamper-evident seals and compare batches right down to the silica content.

Experience in the Industry

Early in my job at a pharma factory, one batch failed on silica test. Our QA manager sent it straight back—not worth the regulatory headache of a substandard batch making its way to customers. Every failed batch means more paperwork, delays, and extra expenses; so companies double down on testing not just raw powder, but also final blends. Factories with a reputation for spotlessness rarely see problems, yet even big names can slip. That’s why hands-on oversight and signed batch records mean more than any fancy marketing claim on a flyer.

Where Problems Crop Up

Sometimes, problems trace back to suppliers in regions with weaker oversight. Documentation might look good on paper, but on closer inspection, numbers may not tally or details go missing. Regulatory inspectors know these tricks, and catching a non-compliant lot can mean pulling entire product lines from shelves. Watching production over the years, I learned it’s not about squeezing the most out at the lowest cost. Shortcuts end up biting back, sometimes badly enough to cause lost business for years.

How to Get It Right

Firms serious about compliance stick to validated sources for cellulose and silica. They invest upfront in qualified labs—whether in-house or certified third party—and demand full transparency up and down the supply chain. Good manufacturing practice (GMP) isn’t optional; records must prove each lot matches pharmacopeia limits. Leaders in pharma don’t just talk compliance—they build it into every step.

It’s less about buying a "compliant" material and more about building a traceable, consistent process. With regulators raising the bar, no one wants to answer questions about why something slipped through. In this field, every detail counts; often, the rewards go to those who treat every new batch as a new test, not just a repeated routine.

What are the typical specifications or properties of this co-treated excipient?

Why Co-Treated Excipients Matter

Any pharmacist or formulator working with compressed tablets knows the uphill battle of finicky powders. Years spent in labs and production lines teach a person pretty quickly that the choice of excipient separates a headache from a smooth shift. Co-treated excipients have become a favorite for more than just their technical specs—they help finished products stay consistent, giving production teams a fighting chance in the pressure-cooker environment of pharma manufacturing.

Physical Properties Worth Talking About

Few people outside the industry realize how much physical properties matter. Powder flow sticks out as the day-to-day worry for many operators. Abrasive, sticky, or uneven blends always threaten to jam up machines. Co-treated blends, especially those based on cellulose or starch with finely balanced particle sizes, tend to move through hoppers easily. Consistent particle distribution gives less downtime and fewer rejected batches.

Moisture content gets overlooked by some, but anyone chasing compliant dissolution results or dealing with hygroscopic actives watches it like a hawk. These excipients often show a narrow moisture range, usually well below 5%, which helps avoid surprises in stability tests. A stable moisture profile lets formulations ride out storage and transport challenges without morphing in the bottle.

Performance in Compression and Content Mixing

Direct compression saves steps, reduces errors, and speeds up timelines. Most co-treated excipients built for this purpose deliver solid tablet strength at lower compression forces. This is more than just numbers—a reliable excipient that creates tablets with decent crushing strength (usually 70-100 N in standard oral tablets) helps scale up batches without multiple reworks.

Mixing performance brings another layer of practicality. Co-treatment with different binders and fillers often reduces segregation risk, so actives and carriers stay blended from bin to tablet punch. In hands-on settings, fewer blend uniformity failures mean less wasted material and fewer investigations in quality control departments.

Chemical Compatibility Saves Projects

Formulators rarely have the luxury of simple actives. Many modern molecules push limits with poor stability or tricky interactions. Co-treated products, where ingredients are combined at a microscopic level (say, spray-dried cellulose with silica), show higher stability with sensitive APIs. This isn’t just marketing. Real-world data backs up claims that co-treated materials avoid chemical incompatibilities seen with mechanical blends. Pharmaceutical teams have seen improved shelf-life and API protection when switching to these multi-component carriers.

Solutions that Come from Experience

It pays to invest in excipients that offer reproducible flow and compaction, especially in continuous manufacturing or high-speed rotary presses. By talking to operators and checking root causes on deviation reports, the value of consistent material becomes obvious. Pharmaceutical companies could spend less on machine maintenance, batch rework, or failed dissolution tests by favoring high-grade co-treated blends over single-source powders.

What the Numbers Show

Measured properties don’t just decorate spec sheets. Flow properties like angle of repose (often below 30°), tapped density, and Hausner ratio (hovering close to 1.1 for quality blends) reflect actual processing ease. True density numbers help when calculating compactibility and adjusting punch settings on presses. These values, monitored lot to lot, signal the manufacturer’s control over production processes. Analysts tracking these numbers make it easier for regulators, QA, and production teams to trust the product.

Putting Science to Work in the Real World

Working in pharmaceutical labs drills home the point: real improvements in blends affect efficiency and patient outcomes. Investing in better excipients isn’t just a technical choice—it creates a smoother workflow, fewer surprises, and a better product for end users. Good data, shared experiences on the plant floor, and careful material selection often build better tablets than any theoretical claim or sales pitch ever will.

How should Microcrystalline Cellulose Colloidal Silica Co Treated Material be stored and handled in pharmaceutical manufacturing?

Quick Reactions Prevent Quality Slips

As someone who has spent years working with raw materials in pharma production, I know how even slight handling mistakes can slow down a whole batch—or send a product out of spec. Microcrystalline cellulose colloidal silica co treated powders arrive at the factory clean, free-flowing, and packed with promise. Keeping them that way takes attention and common sense.

Moisture Is the Enemy

Humidity chews up these powders. Too much in the air, and the cellulose draws in water like a sponge, causing clumps that break up tablet presses and mess with accuracy. In my experience, storage only works if it's cool and bone dry. Most facilities keep these materials in sealed, high-grade drums or double-layer bags inside dehumidified storerooms. Hygrometers set near the storage racks help track air conditions throughout the day. Staff check those readings at every shift change, because one missed spike is all it takes to turn a thousand kilos of powder into landfill.

Clean Storage Works Better—So Does Rotation

Dirt, oil, and crumbs from past batches creep into everything. Good habit is to clean the storage areas before every delivery, use food-grade pallets, and never stack containers near open windows or vents. I’ve seen less careful producers lose batches to airborne dust—even pollen finds a way in. The best-run places run first-in, first-out rotation, block other materials from sharing shelves, and log lot numbers right as goods arrive.

Temperature Controls Cut Down on Surprises

Heat isn’t as harmful as moisture, but swings in temperature can make condensation inside bags, which brings its own trouble. The warehouses worth their rent keep the air steady, usually around 20 to 25°C, and away from outside walls that pick up sun or lose heat at night. Insulated panels and automatic alarms for temperature drift can seem fancy—right up until a power outage or sudden summer storm. These investments save money by keeping raw materials within specification.

Care in Handling Stops Cross-Contamination

Loading and moving these powders needs more than a forklift and a strong back. Sturdy gloves and face masks keep not just the worker safe but keep skin oils, sweat, or bits of cardboard from tainting the product. Strict PPE rules have kept me out of the nurse’s office and prevented a whole batch of tablets from picking up off-flavors or microbial bugs. Designated scoops, never shared with other ingredients, show respect for the risks of cross-contamination—there’s no shortcut here.

Proper Documentation Backs Up Every Choice

All the best practices in the world mean little if you can't show the data. Years of audits taught me: record everything. Keep digital logs of humidity, temperature, and cleaning events. Document every movement of every batch within the plant. If something heads out of bounds or sits in an open bin even for half an hour, write it down. These records not only pass inspections, but they keep habits tight and quality high when new staff join the team.

Pushing for Improvements

Manufacturers improve faster by reviewing this data with the staff who actually load, store, and measure materials. Regular refresher training rooted in real near-misses or minor slips ensures nobody forgets what’s at stake. Building a team culture that prizes small wins—like shaving humidity by 2%, or spotting signs of packaging wear before spills happen—beats costly recalls or customer complaints.

Microcrystalline Cellulose Colloidal Silica Co Treated Material BP EP USP Pharma Grade
Names
Preferred IUPAC name Microcrystalline cellulose co-processed with colloidal anhydrous silica
Other names MCC Colloidal Silica Co-processed
Microcrystalline Cellulose Colloidal Silicon Dioxide Co-processed
MCC Silica Co-Processed
MCC with Colloidal Silica
Microcrystalline Cellulose and Colloidal Silica Blend
Pronunciation /ˌmaɪ.krəʊˈkrɪs.təlɪn ˈsɛl.jʊˌloʊs ˌkɒˈloʊ.di.əl ˈsɪ.lɪ.kə ˈkoʊ ˈtriː.tɪd məˈtɪə.ri.əl ˌbiːˈpiː ˌiːˈpiː ˌjuːˌɛsˈpiː ˈfɑːr.mə ˈɡreɪd/
Identifiers
CAS Number 9004-34-6
Beilstein Reference 35369
ChEBI CHEBI:64653
ChEMBL CHEMBL1201560
ChemSpider 77905291
DrugBank DB00639
ECHA InfoCard 03bbf513-8d45-4a77-b7cc-7cdfb7f4c4d3
EC Number 9004-34-6
Gmelin Reference 1685765
KEGG C18735
MeSH Cellulose, Microcrystalline; Silicon Dioxide
PubChem CID 6911769
RTECS number FJ5950000
UNII YUP0A1Z315
UN number Not Classified
CompTox Dashboard (EPA) DTXSID6025046
Properties
Chemical formula C6H10O5
Molar mass Molar mass: "Variable (mixture, not a defined molecule)
Appearance White or almost white, odorless, fine or granular powder
Odor Odorless
Density 0.26 - 0.31 g/cm³
Solubility in water Insoluble in water
log P -5.0
Magnetic susceptibility (χ) Diamagnetic
Refractive index (nD) 1.536
Viscosity Non-viscous
Thermochemistry
Std molar entropy (S⦵298) 365 J·mol⁻¹·K⁻¹
Std enthalpy of formation (ΔfH⦵298) Unknown
Pharmacology
ATC code A16AX
Hazards
Main hazards Not a hazardous substance or mixture.
GHS labelling Not classified as hazardous according to GHS
Pictograms GHS07
Hazard statements This product is not classified as hazardous according to GHS. Therefore, the Hazard statements string is: "Not a hazardous substance or mixture according to Regulation (EC) No. 1272/2008 (CLP/GHS).
Precautionary statements Keep container tightly closed. Store in a dry, cool, and well-ventilated place. Avoid breathing dust. Use personal protective equipment as required. Wash thoroughly after handling. Avoid contact with eyes, skin, and clothing.
NFPA 704 (fire diamond) NFPA 704: 1-0-0
Autoignition temperature 420°C
LD50 (median dose) > 31600 mg/kg (Rat, Oral)
NIOSH Not listed
PEL (Permissible) PEL (Permissible Exposure Limit) for Microcrystalline Cellulose: 15 mg/m³ (total dust), 5 mg/m³ (respirable fraction) as per OSHA. For Colloidal Silica: 20 mppcf (million particles per cubic foot) or approximately 0.8 mg/m³ as per OSHA.
IDLH (Immediate danger) No IDLH established.
Related compounds
Related compounds Cellulose
Microcrystalline Cellulose
Silicon Dioxide
Colloidal Silicon Dioxide
Hydroxypropyl Cellulose
Methylcellulose
Carboxymethylcellulose Sodium
Cellulose Powder
Powdered Cellulose