What This Grade Is For
White Powder Hydroxypropyl Methyl Cellulose is supplied by Yiyuantong Chemical as a rheology modifier and protective colloid in latex and emulsion paint. The listing is the standard white powder presentation, the format most incoming inspections are written around. Hydroxypropyl methyl cellulose, abbreviated as HPMC or MHPC.
Key Benefits
- Builds working viscosity at low addition, so the formulation carries more solids without thinning
- Consistent white powder appearance, screened at 40 mesh, so dosing and dispersion behave the same lot to lot
- Holds pigment and extender in suspension through long storage, reducing hard settling at the drum bottom
- Improves brush and roller flow so the film levels out instead of keeping applicator marks
- Acts as a protective colloid during emulsion let-down, keeping the system stable against shear
- Export packed and documented for container shipment, with lot analysis issued before departure
Problems It Solves
- Latex paint that sags on vertical walls and leaves roller marks after the second coat
- Batch-to-batch viscosity drift that forces line operators to re-adjust every let-down
- Pigment and filler settling in storage, so the first drum poured differs from the last
- Poor open time in hot weather, which closes the wet edge before a wall is finished
Application Scenarios
- Interior and exterior architectural latex paint
- Water-based primers and sealers
- Texture and relief coatings applied by spray or trowel
- Putty and skim coats used ahead of topcoat
Who It Is For
- Architectural paint manufacturers running latex lines
- Coating formulators developing low-VOC waterborne systems
- Contract blenders supplying private-label paint brands
Technical Features
- High water retention lets cement hydrate fully and raises bonding strength
- Improves tensile and shear strength in plastering mortar
- Reduces sagging and cracking in putty and skim coat work
- Acts as a retarder in gypsum, solving drumming and early strength problems
- Used as an excipient and as a lubricant in ophthalmic formulations
Technical Data And Packing
| Product Name | Hydroxypropyl Methyl Cellulose |
|---|---|
| CAS No | 9004-65-3 |
| EINECS | 618-389-6 |
| Chemical Formula | C3H7O* |
| Molecular Weight | White Powder |
| Viscosity | 59.08708 |
| Density | 1.39 |
| Melting Point | 225-230 °C Flash Point 619.9°C Vapor Pressure 0mmHg at 25°C HS Code 39129000 |
Packing is 25 kg per bag as standard: an inner polyethylene plastic film bag inside an outer composite plastic woven bag. Other pack sizes are arranged on request.
Raw Materials
- Refined cellulose
- Methyl chloride
- Propylene oxide
Manufacturing Process
- Alkalisation of refined cellulose
- Mixed etherification
- Washing and purification
- Drying and milling
- Lot testing and packing
Quality Control
- Every lot is tested in our own laboratory against the customer specification before release
- Third-party verification is available through SGS, which we have worked with on export lots
- Certificate of analysis issued with each shipment; HPLC or NMR data supplied on request
- Acetone countercurrent washing removes process residues before drying and milling
How It Compares
| Alkali-swellable acrylic thickeners | HEC develops viscosity without relying on neutralisation, so it is less sensitive to formulation pH swings |
|---|---|
| Hydroxypropyl methyl cellulose | HEC gives better enzyme and salt tolerance in waterborne paint; HPMC is normally chosen for cement and gypsum systems |
Use Guide
- Disperse the powder into the grind or let-down stage under agitation; avoid dumping into still water
- Where a fast let-down is needed, pre-slurry in a water-miscible solvent or wet with cold water before raising pH
- Hydration is faster above pH 8; adjust alkali after the powder is fully wetted
- Check viscosity after full hydration, not during the first minutes of mixing
Customisation Options
- Viscosity grade selected against your process, from 300 to 200000 mPa.s
- Private label bags printed with your own label content
- Packing sizes arranged to suit your blending line
- Sample shipment by FEDEX, DHL or EMS before a production order
Certification And Inspection
- SGS third-party inspection available on export lots
- Certificate of analysis issued with every shipment
- HPLC or NMR data supplied on request
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View SpecificationWhite Powder Hydroxypropyl Methyl Cellulose FAQ
What viscosity grade should I order for interior latex paint?
Our HEC covers 300 to 200000 mPa.s. Tell us your target Stormer or ICI reading and the solids level you run, and we will send the matching grade for a trial.
Will the powder lump when it is added to the let-down?
Add it under agitation rather than into still water, and hydrate before the alkali is raised. We can also advise a pre-slurry step for fast lines.
How consistent is the appearance between lots?
Appearance, screening rate and water content are checked on every lot. Any deviation is reported on the certificate of analysis before the goods leave.
Are you a manufacturer or a trading company?
We are a manufacturer and you are welcome to visit the plant. Our hydroxyethyl cellulose project runs at 5000 tonnes a year on an acetone countercurrent washing process.
What payment terms do you accept?
L/C, T/T, D/A, D/P, PayPal and Western Union. We have worked with China Export and Credit Insurance Corporation for many years.
How fast can you ship?
Stock items are despatched within 5 days of payment. If the grade is not in stock, production and despatch take 7 to 10 days from payment.
Get A Price For White Powder Hydroxypropyl Methyl Cellulose
Send the quantity, the viscosity grade and the destination port. We reply with price, lead time and the lot analysis.