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Performance Requirements for UV Wood Coatings

Release time:

2026-04-03 06:45

Performance Requirements for UV Wood Coatings

As the topcoat in a coating system, the performance of UV wood finish directly determines the product’s user experience and service life. Unlike primers, which focus on filling and sealing, topcoats must simultaneously deliver superior visual appeal and outstanding surface durability. Understanding the key performance parameters of topcoats is essential for meeting critical requirements during product development and process control.

I. Physical Properties

1. Hardness is one of the most important physical properties of topcoats. Topcoats must exhibit high hardness to resist scratches and dents during everyday use. Insufficient hardness can lead to surface scratching, compromising the product’s appearance. High-quality UV topcoats, upon curing, form a dense crosslinked network, delivering outstanding hardness performance.

2. Adhesion is a critical parameter for assessing the bond strength between the topcoat and the primer. The topcoat adheres to the primer, and the intercoat adhesion between the two directly affects the reliability of the coating system. Insufficient adhesion can lead to topcoat blistering or peeling. Sound compatibility design and proper process control are essential prerequisites for ensuring adequate adhesion.

3. Flexibility reflects the topcoat’s ability to accommodate wood deformation. Wood expands and contracts in response to changes in ambient temperature and humidity, so the topcoat must possess a certain degree of flexibility to adapt to such deformation and prevent cracking of the coating. A balanced combination of hardness and flexibility is a key characteristic of a high-quality topcoat.

4. Abrasion resistance refers to the topcoat’s ability to withstand repeated friction. For high-traffic applications such as flooring and tabletops, abrasion resistance directly determines the service life of the coating. Adding abrasion-resistant additives or employing a specialized resin system can enhance the topcoat’s abrasion performance.

II. Chemical Properties

1. Water resistance refers to the topcoat’s ability to withstand water-induced degradation. In everyday use, wood products may come into contact with wet cloths or spillages of beverages. Therefore, the topcoat must exhibit excellent water resistance to prevent water penetration from causing blistering or whitening of the coating.

2. Chemical Resistance Evaluation: This assesses the topcoat’s ability to resist corrosion by various chemical substances. Common items such as alcohol, coffee, tea, cooking oil, and cleaning agents may come into contact with the coating surface. The topcoat must be able to withstand these substances to prevent surface corrosion, discoloration, or softening.

3. Yellowing resistance is one of the critical chemical properties of topcoats. Under prolonged exposure to light, coatings may yellow, compromising the appearance of light-colored and clear finishes. High-quality UV topcoats employ anti-yellowing resin systems that help maintain color stability over long-term service.

III. Optical Performance

1. Gloss level is the core optical performance indicator for topcoats. High-gloss topcoats can achieve a gloss level of 95 degrees or higher, delivering a mirror-like finish; matte topcoats can have a gloss level as low as 5 degrees or less, resulting in a soft, velvety texture. The uniformity of gloss is equally important, as localized variations in gloss can detract from the overall visual appearance.

2. Transparency is a key performance characteristic of clear topcoats. High transparency ensures the wood’s natural grain and color are fully preserved, without any hazing or cloudiness. Transparency is influenced by factors such as resin purity and degree of cure, and therefore requires strict control.

IV. Construction Performance

1. Flow and leveling refer to the ability of a topcoat to spread out and form a smooth, even surface after application. A topcoat with good flow and leveling can eliminate application marks and produce a glossy, uniform film. For high-gloss topcoats, the requirements for flow and leveling are particularly stringent.

Defoaming performance refers to the ability of a topcoat to rapidly rupture and release air bubbles during application. Residual bubbles can lead to pinholes or blister defects on the coating surface, compromising both appearance and protective performance.

2. Wettability assessment: This evaluates the ability of the topcoat to spread evenly over the primer surface. Good wettability is essential for ensuring full contact between the topcoat and primer, thereby achieving strong adhesion.

V. Conclusion

The performance of UV wood topcoats encompasses a wide range of aspects, including physical properties, chemical properties, optical properties, and application performance. Physical properties such as hardness, adhesion, flexibility, and abrasion resistance determine the mechanical strength of the coating; chemical properties such as water resistance, chemical resistance, and yellowing resistance dictate the coating’s durability; optical properties like gloss and transparency influence the decorative effect; and application performance characteristics such as leveling, defoaming, and wetting affect the ease of application and the stability of coating quality. In practical applications, the appropriate type of topcoat should be selected based on the product’s intended use and service environment, and process control must be implemented to ensure that all performance attributes are fully realized.

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Bossin Recommended Products – UV Wood Coatings
Glossy topcoat
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 20% TPGDA
B-163	Modified epoxy acrylate	Good flexibility, excellent pigment wetting, and strong adhesion.
B-165	Modified epoxy acrylate	Good flexibility and strong adhesion
B-21C	Active amine photosensitizing promoter	Low color number, antioxidant and anti-polymerization properties, and enhanced curing rate
B-301	Aromatic Polyurethane Acrylate	Fast curing, excellent toughness, and good grindability.
B-302	Aromatic Polyurethane Acrylate	Fast curing, high strength, good toughness, and excellent grindability.
B-574C	Polyester acrylate	Low viscosity, low odor, excellent wettability, suitable for LED UV
B-601	Aromatic Polyurethane Acrylate	High hardness, scratch resistance, chemical resistance, and excellent cost performance.
B-609	Aliphatic polyurethane acrylate	Fast curing, high hardness, scratch resistance, and chemical resistance.
B-868	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-868H	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-910A2	Aliphatic polyurethane acrylate	Low viscosity, yellowing resistance, chemical resistance, and steel-wool resistance.
B-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, and outstanding chemical and wear resistance.
Matte topcoat
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-160D	Modified epoxy acrylate	Good flexibility, yellowing resistance, and strong adhesion.
B-163	Modified epoxy acrylate	Good flexibility, excellent pigment wetting, and strong adhesion.
B-21C	Active amine photosensitizing promoter	Low color number, antioxidant and anti-polymerization properties, and enhanced curing rate
B-328M	Aliphatic polyurethane acrylate	Low gloss, low viscosity, excellent wettability, and a pleasant hand feel.
B-328R	Aliphatic polyurethane acrylate	Low gloss, excellent matting, good wetting, and a fine, smooth, and silky hand feel.
B-333	Aliphatic polyurethane acrylate	Low viscosity, excellent matting performance, good wetting, and excellent flexibility.
B-572	Polyester acrylate	Low viscosity, low odor, excellent wettability, suitable for LED UV
B-650A	Aliphatic polyurethane acrylate	Low viscosity, excellent matting effect, fast curing, and good wettability.
B-868	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-868H	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-910A2	Aliphatic polyurethane acrylate	Low viscosity, yellowing resistance, chemical resistance, and steel-wool resistance.
B-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, and outstanding chemical and wear resistance.
Bright White Finish
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 20% TPGDA
B-160D	Modified epoxy acrylate	Good flexibility, yellowing resistance, and strong adhesion.
B-301	Aromatic Polyurethane Acrylate	Fast curing, excellent toughness, and good grindability.
B-302	Aromatic Polyurethane Acrylate	Fast curing, high strength, good toughness, and excellent grindability.
B-560	Polyester acrylate	Fast curing and excellent pigment wetting
B-574C	Polyester acrylate	Low viscosity, low odor, excellent wettability, suitable for LED UV
B-601	Aromatic Polyurethane Acrylate	High hardness, scratch resistance, chemical resistance, and excellent cost performance.
B-868	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-868H	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, and outstanding chemical and wear resistance.
Individual Recommendation
Product Model/English Abbreviation	Product Name/Product Type	Product Features
BM2223 (TPGDA)	Di(propylene glycol) diacrylate	Good flexibility and low volatility
BM2224 (EO-HDDA)	Ethoxy-1,6-hexanediol diacrylate	Excellent adhesion to plastics, good dilutability, and low volatility.
BM3231 (TMPTA)	Trimethylolpropane triacrylate	High crosslink density, high hardness, high gloss, and excellent wear resistance.
BM3235 (PET3A)	Pentaerythritol triacrylate	Fast curing, high crosslink density, high hardness, and excellent chemical resistance.
BM3380 (3EO-TMPTA)	Ethoxylated trimethylolpropane triacrylate	More flexible and less irritating than TMPTA.
BM6261 (DPHA-80)	Dipentaerythritol hexaacrylate	High crosslink density, high hardness, chemical and wear resistance, and water resistance.
BM6263 (DPHA-90)	Dipentaerythritol hexaacrylate	High crosslink density, high hardness, chemical and wear resistance, and water resistance.

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How to Test the Performance of UV Wood Coatings (Part 1)

Analysis of the Characteristics of UV Wood Finish