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Premium Construction Chemical Additives & Application Solutions

Longou Chem is a leading manufacturer of cellulose ethers (HPMC, HEMC, HEC), redispersible polymer powders, and specialty additives for drymix mortars, coatings, and building materials. Trusted by global partners for over 16 years.

16+

Years Experience

100+

Employees

20%

Masters/PhD

HPMC Powder Production

About Longou Chem

A trusted manufacturer and application solutions provider in the construction chemicals industry, committed to innovation, quality, and global customer support.

Who We Are

Longou International Business (Shanghai) Co., Ltd. was established in 2007 and is headquartered in Shanghai, China. We are a construction chemicals additives manufacturer and application solutions provider, committed to delivering high-performance materials to global customers.

Our Business

We specialize in the R&D, production, and sales of key additives such as cellulose ethers (HPMC, HEMC, HEC) and redispersible polymer powders used in drymix mortars, tile adhesives, putties, coatings, and self-leveling compounds.

Our Team

With over 100 employees, more than 20% hold master’s or doctoral degrees in chemistry, materials science, and engineering. Our technical team ensures product excellence and customized application support.

Our Products

High-performance chemical additives engineered for durability, workability, and water retention in construction and industrial applications.

Hydroxypropyl Methyl Cellulose

Hydroxypropyl Methyl Cellulose (HPMC)

High-purity cellulose ether for tile adhesives, putties, and self-leveling mortars. Excellent water retention and thickening properties.

  • • CAS No: 9004-65-3
  • • Viscosity: 400-100,000 mPa·s
  • • HS Code: 3912.39.00
  • • Applications: Drymix mortars, coatings
Hydroxyethyl Methyl Cellulose

Hydroxyethyl Methyl Cellulose (HEMC)

Water-soluble polymer used as thickener and adhesive. Ideal for gypsum-based and cementitious systems requiring high water retention.

  • • CAS No: 9032-42-2
  • • Grade: LH50M, LH80M, LH20M
  • • HS Code: 3912.39.00
  • • Applications: Wall putty, plasters
Water Retention Agent

Water Retention Agent

Cellulose ether-based agent that enhances workability and prevents premature drying in cementitious systems.

  • • High water retention capacity
  • • Improves adhesion and cohesion
  • • Compatible with various binders
  • • Used in tile adhesives, grouts
Redispersible Polymer Powder

Redispersible Polymer Powder (RDP)

VAE-based powder (ADHES® AP2080) for tile adhesives and flexible mortars. Enhances bonding strength and flexibility.

  • • CAS No: 24937-78-8
  • • Equivalent to VINNAPAS 5010N
  • • HS Code: 3905.29.00
  • • Improves sag resistance
Hydroxyethyl Cellulose

Hydroxyethyl Cellulose (HEC)

Non-ionic cellulose ether used in coatings, detergents, and construction materials for thickening and stabilization.

  • • High purity and clarity
  • • Excellent thickening efficiency
  • • Stable over wide pH range
  • • Applications: Liquid detergents
Cellulose Fiber

Cellulose Fiber

Reinforcing fiber for sprayed mortars, renders, and insulation systems. Improves crack resistance and workability.

  • • Length: 0.5–3 mm
  • • High tensile strength
  • • Enhances cohesion
  • • Used in EIFS and renders
Superplasticizer

Polycarboxylate Superplasticizer

High-range water reducer for concrete and self-leveling compounds. Enables low water-cement ratios and high flowability.

  • • High dispersion efficiency
  • • Long slump retention
  • • Improves strength development
  • • Used in SCC and UHPC
Modified Cellulose Ether

Modified Cellulose Ether

Engineered HEMC variants with enhanced performance for specific formulations in putties and flexible mortars.

  • • Tailored for high flexibility
  • • Improved open time
  • • Reduced air entrainment
  • • Compatible with RDP systems

Applications

Our additives are formulated to meet the demanding requirements of modern construction and industrial processes.

Tile Setting & Grouting

HPMC and RDP enhance adhesion, water retention, and flexibility in tile adhesives and grouts.

Coatings

HEC and HEMC provide viscosity control, sag resistance, and improved application in water-based paints.

External Wall Insulation

RDP and cellulose fibers improve bonding, flexibility, and crack resistance in EIFS systems.

Self-Leveling

Superplasticizers and HPMC ensure flowability, stability, and controlled setting in floor compounds.

16+

Years in Industry

100+

Employees

50+

Global Markets

20%

R&D Team

Frequently Asked Questions

What is HPMC used for in construction?

HPMC (Hydroxypropyl Methyl Cellulose) is used as a water retention agent, thickener, and binder in drymix mortars, tile adhesives, putties, and self-leveling compounds to improve workability and prevent cracking.

How does RDP improve mortar performance?

Redispersible Polymer Powder enhances adhesion, flexibility, and water resistance in cementitious systems. It improves bond strength and reduces brittleness in tile adhesives and renders.

What is the difference between HPMC and HEMC?

HPMC offers higher water retention and is ideal for cement-based systems. HEMC provides better enzymatic resistance and is preferred in gypsum-based formulations and high-temperature applications.

Can your products be customized?

Yes, we offer customized formulations based on viscosity, particle size, and performance requirements for specific applications and regional standards.

Get in Touch

For inquiries about our products, technical support, or pricing, please visit our official website.

Phone: +86 393 6905188

Email: andy@longoucell.com

Visit Official Website

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