HPL stands for High-Pressure Laminate, also known as high-pressure decorative laminate. It is manufactured by hot-pressing decorative paper impregnated with melamine resin and multiple layers of kraft paper impregnated with phenolic resin under high temperature (approx. 150 °C) and high pressure. It is classified into thin decorative HPL (0.35–1.5 mm) and thick solid HPL (compact grade, ≥2 mm). Hermetic /Airtight doors usually adopt standard or anti-bacterial flame-retardant HPL for cladding or surface mounting.
• Core Properties and Advantages for Airtight Doors
1. Weather resistance, wear resistance and impact resistance.
The dense and hard surface features high abrasion resistance, capable of withstanding frequent impacts and scratches from hospital beds and wheelchairs without deformation or delamination over long-term use, making it ideal for high-traffic clean area Airtight doors.
2. Moisture-proof, anti-bacterial and corrosion resistance
Featuring a non-porous surface and resin structure, it is waterproof and mold-proof. Medical-grade HPL can pass anti-bacterial certifications such as JIS Z 2801 and ISO 22166 (anti-bacterial rate >99%), resistant to common disinfectants including chlorine-based and alcohol-based disinfectants without corrosion or discoloration.
3. Flame retardancy and environmental friendliness
Flame-retardant HPL reaches Class B1. (difficult-to-flammable grade), and some customized grades approach Class A. Its VOC and formaldehyde emission comply with E0, ensuring safety in operating rooms and clean rooms.
4. Excellent Airtightness performance and easy maintenance
The panel features high flatness, fitting well with door frame sealants and gaskets without warping or shrinkage, guaranteeing long-term Airtightness. Daily maintenance only requires wiping with a damp cloth, with no need for waxing or special care.
5. Strong decorativeness
Rich in colors and patterns (wood grain, stone texture, solid colors, metallic finishes), customizable colors and textures are available to meet the visual requirements of different spaces such as hospitals, laboratories and clean workshops.
• Typical Application Scenarios
1. For operating rooms, ICU wards and infectious disease isolation rooms.
2. For pharmaceutical factories, electronic clean workshops and sterile laboratories.
3. For food processing plants, biosafety laboratories and other places demanding high cleanliness and disinfection resistance.
• Selection and Construction Key Points
1. Specification selection
Door leaf panels commonly use 0.8 to 1.2 mm thin HPL bonded to steel/aluminum honeycomb substrates. 3 to 6 mm thick solid HPL is recommended for door frames or anti-collision areas. Products with dual anti-bacterial and flame-retardant certifications are preferred.
2. Edge sealing treatment
Seamless edge sealing (e.g., matching thermosetting edge banding, sealant treatment after chamfering) is mandatory to prevent moisture penetration that impairs Airtightness and service life. Exposed cut edges are strictly prohibited.
3. Bonding process
Environment-friendly two-component polyurethane adhesive shall be used, with pressure curing under constant temperature and humidity to ensure no bubbles or hollowing. Surface degreasing is required before bonding with steel or aluminum substrates.
4. Standards and certifications
Compliance with GB/T 7911 (HPL standard) and GB 50333 (Code for Clean Operating Department in Hospitals) is required, along with inspection reports for anti-bacterial performance, fire resistance and formaldehyde emission.
• Technical Specification for HPL Panels of Hermetic Doors
1. Implementation Standards
Domestic: GB/T 7911-2013 High-pressure Decorative Laminate Sheets Based on Thermosetting Resins.
Clean Medical: GB 50333-2013 Code for Clean Operating Department in Hospitals.
Flame Retardancy: GB 8624-2012 Classification for Burning Behavior of Building Materials and Products.
Antibacterial Property: JIS Z 2801 / ISO 22196.
2. Material & Structure
2-1. Structure Composition:
Surface layer: Decorative paper impregnated with melamine resin.
Core layer: Multiple layers of kraft paper impregnated with phenolic resin.
One-step forming: Under high temperature and high pressure.
2-2. Classification
Thin veneer HPL: For flat bonding of door leaves
Compact HPL: For crash rails and door frames
2-3. Functional Requirements
Mandatory functions: antibacterial, flame-retardant, disinfectant-resistant, wear-resistant, moisture-proof.
3. Specification & Dimension Parameters
3-1. Thickness Requirements
Veneer HPL for door leaf: 0.8–1.2 mm
Compact HPL (for crash rail/door frame): 3 mm / 4 mm / 6 mm
Thickness tolerance: ±0.1 mm
3-2. Common Sizes (customizable)
1220 mm × 2440 mm
1525 mm × 3050 mm
(Common sizes requirement of TH100 from TSTC, single door leaf: width≤1500mm, height≤2800mm )
4. Key Performance Technical Indicators
4-1. Antibacterial Performance
Antibacterial type: Broad-spectrum antibacterial (Escherichia coli, Staphylococcus aureus)
Antibacterial rate: ≥99%
Test standard: JIS Z 2801 / ISO 22196
4-2. Burning Performance
Flame retardancy grade: Class B1 (difficultly flammable), Class A customization available
No dripping, no toxic flue gas
4-3. Physical & Chemical Properties
Surface abrasion resistance: ≥6000 revolutions
Scratch resistance: ≥4N
Disinfectant resistance: Resistant to 75% alcohol, chlorine-based disinfectants, quaternary ammonium salt disinfectants, no whitening, fading or cracking
Water resistance: No blistering or delamination after 24h immersion
Stain resistance: No residual marks after wiping coffee, iodophor, etc.
4-4. Environmental Indicators
Formaldehyde emission: Grade E0 ≤ 0.050 mg/m³
Compliant with China Environmental Labeling Certification, CE Certification (for export)
5. Appearance & Surface Requirements
The surface: Shall be flat without bubbles, pinholes, cracks or color difference.
Gloss: Matte / semi-matte (matte preferred for operating rooms)
Color & texture: Solid color, wood grain, stone texture, metallic color, customizable according to color card.
Edges: Cut neatly without chipping.
