Q: What is the minimum order quantity (MOQ)?

Construction and industrial grades: 25 kg bags (starter), 500 kg pallet (standard), 1 MT FCL. Pharma grades (HPMC E5/K4M, HPMCAS): 5–25 kg drums with full GMP documentation. HPMC construction grade (200k cps mortar) ships in 25 kg multi-wall kraft bags with PE liner, pallet of 20 bags. For large construction projects, 500 kg big bags (FIBC) and 20 MT FCL are available. HEC for paint is typically available in 20 kg fiber drums or 25 kg bags. CMC food grade ships in 25 kg food-safe PE-lined bags; battery grade CMC requires sealed aluminum foil bags or drums with desiccant due to moisture sensitivity. Pharma grades (HPMC E, K, HPMCAS) require GMP batch manufacturing records, CoA per USP/NF pharmacopoeia, and IPEC-Americas excipient GMP certificates — minimum order is typically 5 kg for new buyer qualification and 25–50 kg for commercial batches. Lead time for pharma grades is 4–6 weeks for first orders (GMP documentation preparation).

Q: What documents are available — COA, MSDS, TDS?

COA, SDS/MSDS, and TDS standard with all orders. Pharma grades also include GMP certificates, USP/NF compliance declaration, and DMF letter of authorization on request. Construction-grade HPMC COA: viscosity (2% Brookfield, mPa·s), moisture content (≤ 5%), ash (≤ 5%), pH (1% solution), particle size (≥ 95% or Ph. Eur. monograph format including identification (IR spectrum), viscosity, loss on drying, residue on ignition, heavy metals, and individual HPMC character tests. REACH compliance declarations and SVHC absence letters are available for all standard grades on request.

Question 1

HPMC vs HEC for architectural coatings — which should I choose?

Accepted Answer

HEC is generally preferred for latex paint — it is salt-tolerant, gives excellent leveling, and does not affect open time. HPMC is preferred for dry-mix systems (tile adhesive, plaster) where high water retention and thermal stability above 60 °C are critical. HEC is non-ionic, which means it is compatible with most latex emulsions (acrylic, vinyl-acrylic, styrene-acrylic), surfactants, and preservatives without flocculation. Its salt tolerance allows formulation with calcium-based fillers and titanium dioxide slurries. In latex paint at 0.2–0.4%, HEC provides excellent low-shear viscosity (Stormer KU), good in-can body, and clean brush-out without excessive drag. HPMC, however, exhibits thermal gelation (gel point ~60–85 °C depending on grade) — in a wet mortar exposed to summer concrete substrates, this thermal gelling significantly extends open time and improves water retention. HPMC is also more film-forming than HEC, improving cohesive strength in tile adhesive bond lines. For interior wall putty or skim coat, HPMC 75,000–150,000 cps is the standard; for tile adhesive C1/C2, HPMC 200,000 cps at 0.3% is typical.

Question 2

How do I choose the right viscosity grade of HPMC?

Accepted Answer

Higher viscosity gives better water retention and cohesion but increases cost and mixing energy. Tile adhesive and plaster use 150,000–200,000 cps; putty and self-leveling compound use 40,000–100,000 cps; coatings use 10,000–40,000 cps. Viscosity is measured in a 2% aqueous solution at 20 °C using a Brookfield viscometer (spindle 21, 20 rpm). The same nominal viscosity from different producers can differ significantly — always request the actual Brookfield measurement, not just the grade number. Key viscosity breakpoints: 10,000–30,000 cps for putty and skim coat (adequate water retention, lower cost); 75,000–100,000 cps for exterior renders and machine-applied plasters; 150,000–200,000 cps for tile adhesives C1/C2 and heavy-duty mortars (highest water retention and open time). Above 200,000 cps, lumping during dry-mixing becomes a practical challenge — producers often recommend cold-water dispersible grades (surface-treated with glyoxal) for automated mixing plants.

Question 3

What is the difference between HPMC E series and K series in pharma?

Accepted Answer

E series (e.g., E5, E15, E50) has higher methoxyl and lower hydroxypropoxyl substitution — faster-dissolving, used for immediate-release tablet coatings. K series (K4M, K15M, K100M) has lower methoxyl and higher hydroxypropoxyl — slower gel erosion, used for extended-release matrix tablets. HPMC is characterized by two substitution parameters: methoxyl (–OCH₃, DS range 1.1–2.0) and hydroxypropoxyl (–OCH₂CHOHCH₃, MS range 0.1–0.3). In USP/NF nomenclature, the letter suffix encodes the substitution type (E, F, J, K) and the number is the nominal 2% solution viscosity in mPa·s. E-type (methoxyl 28–30%, hydroxypropoxyl 7–12%) dissolves readily at room temperature and is the standard for film coating because the solution stays low-viscosity until the coating dries — Opadry systems typically contain HPMC E5 or E15. K-type (methoxyl 19–24%, hydroxypropoxyl 7–12%) has a lower methoxyl level that shifts the thermal gelation point, and the higher hydroxypropyl level makes the hydrogel layer more robust, enabling 8–24 h drug release profiles. HPMC K4M (4,000 cP nominal) is the workhorse for sustained-release; K100M (100,000 cP) is used when zero-order release or very slow erosion is needed for high-dose drugs.

Question 4

Why does cellulose ether improve mortar workability and what is water retention?

Accepted Answer

Cellulose ether thickens the mixing water into a gel that holds it within the mortar matrix. Water retention (measured per EN 1015-8) prevents premature dehydration when mortar contacts absorbent substrates like concrete blocks or old plaster. EN 1015-8 measures water retention by sandwiching fresh mortar between filter papers under a standardized suction pressure (50 mbar, 5 minutes). Without cellulose ether, a cementitious mortar loses 40–60% of its mix water to an absorptive substrate within minutes, leading to poor hydration, cracking, and bond failure. HPMC at 0.25% reduces water loss to < 5% (≥ 95% water retention per EN 1015-8). The mechanism involves HPMC chains adsorbing to cement particles and forming a continuous hydrated gel network that physically obstructs water migration. Secondary benefits include extended open time (tile adhesive EN 12004 requires ≥ 20 min open time for C1T classification), improved sag resistance for wall-applied adhesives, and enhanced cohesion that reduces trowel drag. At concentrations > 0.4%, cellulose ether may also entrain air — which can reduce compressive strength, so dosage must be balanced against strength requirements.

Question 5

What makes CMC suitable as a battery anode binder?

Accepted Answer

CMC forms a mechanically robust, ionically conductive binder film in aqueous graphite slurries without requiring NMP solvent — reducing cost and toxicity vs PVDF. Its carboxylate groups also help SEI formation on silicon-blend anodes. Lithium-ion anode electrodes traditionally used PVDF (polyvinylidene fluoride) dissolved in NMP (N-methyl-2-pyrrolidone) as binder — expensive, toxic, and requiring solvent recovery systems. CMC (typically DS 0.7, MW 250,000–700,000) dissolved in water can replace PVDF for graphite and graphite-silicon blend anodes. Key advantages: (1) water-based processing eliminates NMP handling; (2) CMC's carboxylate groups interact with native SiO₂ on Si particles, reducing volume expansion stress and improving cycle life; (3) CMC + SBR rubber latex is the industry-standard combination for Si-containing anodes — CMC at 1% provides the stiff adhesion layer, SBR provides elasticity to accommodate volume change; (4) CMC must be battery grade (ultra-low Fe, Na, Ca metals < 10 ppm, moisture < 8%) — food and construction grades are not suitable. Degree of substitution (DS) 0.7 is the commercial sweet spot balancing water solubility and film stiffness.

Question 6

What is the minimum order quantity (MOQ)?

Accepted Answer

Construction and industrial grades: 25 kg bags (starter), 500 kg pallet (standard), 1 MT FCL. Pharma grades (HPMC E5/K4M, HPMCAS): 5–25 kg drums with full GMP documentation. HPMC construction grade (200k cps mortar) ships in 25 kg multi-wall kraft bags with PE liner, pallet of 20 bags. For large construction projects, 500 kg big bags (FIBC) and 20 MT FCL are available. HEC for paint is typically available in 20 kg fiber drums or 25 kg bags. CMC food grade ships in 25 kg food-safe PE-lined bags; battery grade CMC requires sealed aluminum foil bags or drums with desiccant due to moisture sensitivity. Pharma grades (HPMC E, K, HPMCAS) require GMP batch manufacturing records, CoA per USP/NF pharmacopoeia, and IPEC-Americas excipient GMP certificates — minimum order is typically 5 kg for new buyer qualification and 25–50 kg for commercial batches. Lead time for pharma grades is 4–6 weeks for first orders (GMP documentation preparation).

Question 7

What documents are available — COA, MSDS, TDS?

Accepted Answer

COA, SDS/MSDS, and TDS standard with all orders. Pharma grades also include GMP certificates, USP/NF compliance declaration, and DMF letter of authorization on request. Construction-grade HPMC COA: viscosity (2% Brookfield, mPa·s), moisture content (≤ 5%), ash (≤ 5%), pH (1% solution), particle size (≥ 95% < 250 μm for powder), and water retention (EN 1015-8 value if requested). HEC COA: viscosity, moisture, pH, appearance. CMC food-grade COA: degree of substitution (DS), viscosity, pH, purity (≥ 99.5% NaCMC), heavy metals, arsenic per E466/FCC specifications. Battery-grade CMC additionally includes Fe, Na, Ca trace metal assay by ICP-OES. Pharma-grade COA follows USP <661> or Ph. Eur. monograph format including identification (IR spectrum), viscosity, loss on drying, residue on ignition, heavy metals, and individual HPMC character tests. REACH compliance declarations and SVHC absence letters are available for all standard grades on request.

Application	Recommended Grade	Key Property	Typical Dosage
Tile adhesive / cement mortar	HPMC 200k cps (mortar grade)	Water retention ≥ 96%, open time	0.2–0.4%
Interior latex paint	HEC medium MW (Natrosol equiv.)	Thickening, sag resistance, brushability	0.2–0.5%
Exterior facade plaster	HPMC 75k–150k cps	Water retention + cohesion	0.2–0.35%
Extended-release tablet	HPMC K4M or K100M (pharma)	Gel layer diffusion control	10–30% of tablet weight
Immediate-release tablet coat	HPMC E5 (pharma, low viscosity)	Fast dissolve film coating	2–5% of tablet weight
Enteric capsule / coating	HPMCAS (HP-55 / LF grade)	Gastric resistance, intestinal release	3–8% of tablet weight
Battery anode (Li-ion)	CMC anode binder grade (DS 0.7)	Binding + electrolyte compatibility	1–2% of slurry solids
Detergent anti-redeposition	CMC detergent grade	Soil suspension in wash liquor	0.5–1.5%
Oilfield drilling fluid	CMHEC fluid loss additive	Fluid loss control, salt tolerance	0.5–2% of mud weight

Dow / Ashland / SE Tylose Brand	China Equivalent	Major Chinese Producers
Methocel K4M (Dow, HPMC pharma)	HPMC K4M / Metolose K4M equiv.	山东赫达 (Heda), 泸州北方 (Luzhou BF), 蓝晟 (Lansen)
Methocel E5 (Dow, HPMC pharma)	HPMC E5 / low-viscosity pharma grade	山东赫达, 泸州北方, 华润化学 (CR Chem)
Culminal MHPC (SE Tylose, construction)	HPMC 200k cps mortar grade	山东赫达, 四川宏达 (Sichuan HD), 安徽皖维 (Wanwei)
Natrosol 250 HHR (Ashland, HEC)	HEC 250 HHR / high-viscosity HEC	上海长光 (Changguang), 博晖 (Bohui), 武汉强森 (Qiangsen)
Cellosize QP-100MH (Dow, HEC)	HEC QP-100MH equiv. (medium-high)	上海长光, 博晖, 武汉强森
Natrosol Plus 330 CS (HMHEC)	Hydrophobically modified HEC	上海长光, 博晖 (limited supply)
Blanose CMC (Ashland, food)	Sodium CMC food grade (E466)	山东赫达, 武汉强森, 广州天赐 (Tinci)
Finnfix CMC (Ashland, paper)	CMC paper & coating grade	山东赫达, 武汉强森, 安徽皖维
Methocel A4C (Dow, MC)	Methyl Cellulose A4C equiv.	山东赫达, 泸州北方
Ethocel Std 10 (Dow, EC)	Ethylcellulose N10 / EC Std 10	云南中烟工业 (Yunnan Tobacco Ind.), 福建中烟
Klucel LF (Ashland, HPC)	HPC LF low-substitution grade	山东赫达, 泸州北方
AQOAT AS-LF (Shin-Etsu, HPMCAS)	HPMCAS LF / HP-55 type	山东赫达 (main), 泸州北方

Cellulose Ethers — HPMC, HEC, CMC, MC & EC

Quick-Pick by System

All Grades (by chemistry class)

HPMC — Hydroxypropyl Methylcellulose(6)

Hydroxypropyl Methylcellulose (HPMC)

Hydroxypropyl Methylcellulose (HPMC) for Mortar & Tile Adhesive

HPMC Coating Grade

HPMC Thickener

Hydroxypropyl Methylcellulose E5 (HPMC E5)

Hydroxypropyl Methylcellulose K4M (HPMC K4M)

HEC — Hydroxyethyl Cellulose(5)

Hydroxyethyl Cellulose (HEC)

Hydroxyethyl Cellulose (HEC)

Hydrophobically Modified HEC

Hydroxyethylcellulose (HEC, Cosmetic Grade)

HEC Thickener Hair

CMC — Carboxymethyl Cellulose(5)

Carboxymethyl Cellulose (CMC)

Sodium Carboxymethylcellulose (CMC)

Carboxymethyl Cellulose (Paper & Coating Grade)

CMC Anti-redeposition Agent

Carboxymethyl Cellulose (CMC) Anode Binder/Thickener

MC & EC — Methyl & Ethyl Cellulose(5)

Methyl Cellulose Thickener

Methyl Cellulose

Methyl Cellulose (MC) for Dry-Mix Mortar

Ethyl Cellulose

Ethylcellulose N10 (EC N10)

Specialty — HPC, HPMCAS, CMHEC(3)

Hydroxypropyl Cellulose LF (HPC LF)

Hypromellose Acetate Succinate (HPMCAS)

Carboxymethyl Hydroxyethyl Cellulose (CMHEC) Fluid Loss Additive

Imported Brand → China Equivalent

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