HPMC for gypsum

Hydroxypropyl Methylcellulose (HPMC) is a key additive used in a variety of building materials, and its role in gypsum-based products is especially crucial. Gypsum, widely used in construction for plastering, drywall, and other applications, requires specific properties to ensure ease of use and durability. HPMC is introduced into gypsum formulations to enhance several characteristics, making it an indispensable component in modern construction.

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What is HPMC

HPMC is a chemically modified cellulose derivative with unique properties. It is highly soluble in water, forming a transparent gel or solution at low concentrations. HPMC is widely used in industries ranging from pharmaceuticals to construction due to its multifunctional nature. In the construction industry, its application in gypsum-based products like plaster, putty, and dry mortar is well-established.

Applications of HPMC in Gypsum-Based Products

Gypsum Plaster: In plastering applications, HPMC ensures smoother application, better adhesion, and enhanced water retention, which leads to improved durability.

Gypsum Putty: For finer finishing, HPMC improves the spreadability and ensures a smooth finish, reducing the need for extensive sanding.

Drywall Joint Compounds: HPMC enhances the consistency and spreadability of joint compounds, making it easier to fill gaps and seams between drywall sheets.

Gypsum-Based Mortars: In mortars, HPMC helps improve the strength and adhesion properties, especially in situations where the substrate might be challenging to bond to.

Hydroxypropyl methylcellulose (HPMC) plays a significant role in gypsum, offering several beneficial properties that enhance their performance. Let's explore the role of HPMC in gypsum in relation to good water retention, excellent thickening effect, better workability, anti-sagging, and longer open time:

1. Good Water Retention: HPMC in gypsum formulations demonstrates excellent water retention properties. It forms a gel-like structure when in contact with water, effectively trapping and holding water molecules. This property helps to maintain an adequate moisture level in the gypsum mixture, preventing premature drying and ensuring optimal hydration. Good water retention contributes to improved workability, extended open time, and reduced shrinkage in gypsum-based materials.

2. Excellent Thickening Effect: HPMC acts as a highly effective thickener in gypsum-based products. When added to the mixture, it disperses and swells, increasing the viscosity of the material. This thickening effect imparts a desirable consistency to the gypsum mixture, making it easier to handle and apply. It also helps to prevent excessive sagging or running of the material, ensuring that it adheres well to vertical surfaces and maintains its desired shape.

3. Better Workability: The presence of HPMC significantly improves the workability of gypsum-based materials. The thickening effect of HPMC contributes to a smoother and more easily spreadable consistency, facilitating application and reducing the effort required during installation. This enhanced workability allows for better control and manipulation of the material, resulting in improved finishing and surface quality.

4. Anti-Sagging: HPMC is effective in preventing sagging or slumping of gypsum-based materials. The thickened consistency achieved with HPMC ensures that the material maintains its shape and adheres well, even on vertical surfaces. This anti-sagging property is particularly important in applications such as plastering or jointing, where the material needs to stay in place and provide a smooth, level finish.

5. Longer Open Time: Open time refers to the period during which a gypsum-based material remains workable after mixing. HPMC extends the open time of gypsum products by slowing down the drying process. The gel-like structure formed by HPMC retains moisture within the material for a longer duration, allowing for more extended working time. This longer open time is beneficial, especially in larger projects or when complex detailing is required, as it provides ample time for proper installation and finishing.

6. Enhanced Adhesion: For gypsum to be effective, it must adhere properly to the substrate it is applied to. Poor adhesion can lead to peeling, cracking, or a weakened structure. HPMC enhances the bonding strength of gypsum, ensuring better adhesion to a variety of surfaces such as brick, concrete, or drywall. This leads to increased durability of the applied material, making the construction more resilient to wear and tear over time.

7. Crack Resistance: Cracking is a common problem in gypsum-based materials, particularly if they dry too quickly or unevenly. By retaining moisture and controlling the setting time, HPMC helps prevent cracking, ensuring a smoother, more resilient finish. This is particularly important in high-traffic areas where cracks can quickly degrade the quality of the surface.

In summary, HPMC plays a versatile and crucial role in gypsum-based materials by offering good water retention, excellent thickening effect, improved workability, anti-sagging properties, and longer open time. These characteristics contribute to easier handling, better application, enhanced performance, and superior finished results in various construction applications involving gypsum.

HPMC Description

Hydroxypropyl methyl cellulose (HPMC) is a natural polymer materials as raw materials,through a series of chemical processing and prepared non-ionic cellulose. It contains almost methyl cellulose(MC) of all the performance, your first choice for production of high quality building materials additives.To meet the needs of environmental protection, Our product with high water retention, dispersion, good fineness, good work ability, easy dissolution characteristics.It suitable for dry mortar building, both inside and outside wall putty powder milk (cream), adhesives, caulks, interface agents, coatings, self-leveling agent of new building materials.

CAS NO.: -65-3

Other Names: Hypromellose

EINECS No.: 220-971-6

Purity: 99.9%min

Place of Origin: Hebei, China

Brand Name: HONGHAI

Packing: 25Kg/bag

Certification: ISO

Application: Construction additives

HS Code:

Grade: Industrial grade

Supply Ability: MTS/Month

Product Name

HPMC (Hydroxypropyl Methyl Cellulose)

Content of Methoxy

18%-32%

Content of Hydroxypropyl

8%-16%

Temperature of Gelation

54&#;-75&#;

For more Hydroxypropyl Methylcellulose For Gypsum Plastersinformation, please contact us. We will provide professional answers.

Water

&#;5%

Ash

&#;2%

PH Value

7-8

Appearance

White Powder

Fineness

80-100 Mesh

Viscosity

200 to 200,000 it can be customized according customer needs.

Surface treatment

Cold water instant type:surface treated

Non-instant type:without surface treatment

HPMC characteristics

HPMC Applications

HPMC(Hydroxypropyl Methyl Cellulose) with high water retention, dispersion, good fineness, good work ability, easy dissolution characteristics.It suitable for dry mortar building, both inside and outside wall putty powder milk (cream), adhesives, caulks, interface agents, coatings, self-leveling agent of new building materials.

HPMC For Wall putty

Water retention: maximized water content in slurry.

Anti-sagging: when spreading a thicker coat corrugation can be avoided.

Increased mortar yield: depending on the weight of the dry mixture and appropriate formulation ,HPMC can increase the mortar volume.

HPMC For Exterior Insulation and Finish System ( EIFS )/ETICS

Improved adhesion.

Good wetting ability for EPS board and substrate.

Reduced air entrancement and water uptake.

HPMC For Self-leveling

Protection from water exudation and material sedimentation.

No effect on slurry fluidity with low viscosity

HPMC, while its water retention characteristics improve the finish performance on the surface.

HPMC For Crack Filler

Better workability: proper thickness and plasticity.

Water retention ensures prolonged work time.

Sag resistance: improved mortar bonding ability.

HPMC For Tile Adhesives

Better workability: lubricity and plasticity of plaster is ensured, mortar can be applied easier and quicker.

Good water retention: prolonged opening time will make tiling more efficient.

Improved adhesion and sliding resistance: especially for heavy tiles.

HPMC For Dry mix mortar

Easy dry mix formula due to cold water solubility: lump formation can be easily avoided, ideal for heavy tiles.

Good water retention: prevention of fluid loss to the substrates, the appropriate water content is kept in mixture which guarantees longer concreting time.

HPMC For Cement Plaster

Increased water demand: increased open time, expanded spry area and more economical formulation.

Easier spreading and improved sagging resistance due to improved consistency.

FAQ

Q: Are you trading company or manufacturer ?
A: We are factory.
Q: Do you provide samples ? Is it free or extra?
A: Yes, we could offer 200 g free sample for each grade.
More than 1kg, we provide free samples, but the freight will be afford by clients.
Q: How can I get the samples?
A: Send sample request by or , we'll dispatch samples by DHL or TNT.
Q: How long is your delivery time?
A: Generally it is 3-5 days if the goods are in stock.
For big orders 50-200 tons, we could delivery within 20 days.
Q: What is your terms of payment ?
A: Payment &#;USD, 100% in advance.
Payment>USD, T/T(30% in advance and balance against B/L copy)or L/C at sight.
Q: How about OEM branding and packing?
A: Blank bag, Neutral bag available, OEM bag also available.
Q: How to ensure stable quality
A:  (1) All production process is automatic controlled by DSC system, no manual operation, so the quality of different batches are consitent.
(2) We test the sample before sending to you, and delivery goods at same quality for normal orders.
(3) Our QC and Lab will test all the raw materials purchased, test all finished products before delivering.  

If you are looking for more details, kindly visit Redispersible Polymer Powder.