Polyurethane-based and acrylic resins are dominating materials in wood coatings and engineering plastics. However, to ensure coating system stability and high performance, choosing the right hardener and resin is critical. Covestro, a global leader in material science, offers a proven portfolio of products renowned for durability, system compatibility, and application efficiency. Below are five standout products widely used in factories and processing workshops today.
1. DESMODUR® N 75 – ALIPHATIC POLYISOCYANATE FOR HIGH-GLOSS EXTERIOR COATINGS
Desmodur® N 75 is an aliphatic HDI-based polyisocyanate hardener commonly used in 2K PU coatings. With a light-stable structure, it offers excellent yellowing resistance and outstanding weather durability. The resulting film is transparent, highly durable, scratch-resistant, and maintains gloss over time. This grade is widely used in semi-gloss wood coatings, automotive topcoats, and premium outdoor furniture finishes requiring long-lasting color stability.
2. DESMODUR® L 75 – COST EFFECTIVE AROMATIC POLYISOCYANATE WITH FAST CURING
Desmodur® L 75 is a fast-reacting aromatic TDI-based polyisocyanate that produces a distinctly hard film. While it lacks UV stability compared to aliphatic types, it is highly suitable for primers and interior applications. It enables rapid film formation, quick surface drying, and significant hardness development. Commonly used in industrial wood coatings, MDF coatings, and base layers for matte finishes.
3. BAYHYDUR® 302 – WATER BASED HARDENER
Bayhydur® 302 is a water-dispersible polyisocyanate commonly used in water-based PU coating systems. It reacts efficiently with OH-functional resins such as Bayhydrol® U or Bayhydrol® A.
Key advantages include balanced drying time, high film clarity, and no foaming during spraying. This hardener is ideal for interior furniture, matte wood coatings, and flexible films like soft plastics or synthetic leather.
4. BAYHYDROL® A XP 2695 – WATER BASED ACRYLIC RESIN FOR HIGH GLOSS AND HARD FILM FORMATION
Bayhydrol® A XP 2695 is a water-dispersible acrylic resin offering natural high gloss and excellent hardness. It is particularly well-suited for low-VOC primer and topcoat formulations. Thanks to its water resistance and abrasion durability, it is widely used in interior wood furniture, molded plastics, and even thin-film overprint varnishes. When combined with Bayhydur®, it delivers uniform drying and non-yellowing performance.
5. DESMOPHEN® C 2200 – POLYCARBONATE DIOL FOR ENHANCED ELASTICITY AND IMPACT RESISTANCE
Desmophen® C 2200 is a polycarbonate diol with an OH value of 1.9–2.2 meq/g, designed to create highly elastic PU networks. When combined with Desmodur®, it yields PU systems with excellent flexibility, strong adhesion, and high mechanical strength. Common applications include synthetic leather coatings, elastic films, and technical uses such as flexible electronic components, soft cables, or tensile-resistant PU tubing.
6. CONCLUSION
Each Covestro product line has its own unique technical characteristics, tailored to specific substrates, aesthetic requirements, and usage conditions. Selecting the right hardener or resin ensures better quality control, improved durability, and optimized formulations. Vichem – the exclusive distributor of Covestro in Vietnam – is always ready to provide application consulting, formulation guidance, and on-site technical support for each specific system.
📞 Contact: 0817901790
📧 Email: contact@vichem.vn
🔎 LinkedIn: Vichem JSC
🌐 Website: Vichem.vn
