The double skin sandwich panel from the leading Sandwich Panels Suppliers and Manufacturer Qatarcomes with a preprinted galvanized metal panel that is adhered to a thick layer of Polyurethane. In a sandwich panel, the sandwich skins or laminates are like the flanges while the core is like the web. These insulated roofing panels are adept at efficiently covering expansive roof areas, presenting an optimal solution for various structures. The PIR insulation core is 15 to 50mm. Dimensions & Thicknesses SolarSpan® is Australia’s leading insulated roofing panel offering long-spans, low pitch and high thermal efficiency to satisfy Section J requirements in commercial, industrial and residential applications. This all-in-one roofing solution provides a prefinished ceiling-like underside and outstanding cooling performance. , a leading panel manufacturing company in Nepal and a proud subsidiary of SY CO. Profiles of inner surface of roofing sandwich panels (PRT Z) Trapezoid PH Trapezoid at increments 100 (Т1) Flat (0) 1. The interior skin is . 2 mm. 16 100mm Panel 2. 9 100mm Panel 10. They are designed to enclose sloping roofs with a minimum slope of 7%. 3 mm. Our high-performance roof & wall sandwich panels are available in different profiles, finishes and colors and provide excellent thermal insulation, good noise reduction and shorter construction time and. Roofing sheets/panels, wall panels, insulation panels, and cold storage doors are all manufactured by the company. The pre-manufactured sandwich panels (composite panels) are excellent choice for heat insulated roof and wall cladding of industrial and commercial buildings. Our roof panel systems are the go-to choice for industrial and commercial building exteriors as well as a range of other applications, offering high energy-efficiency and weather protection. Length range is from 200 to 12000 mm. 50mm Panel 1. 5-3%. Sandwich panel references Detail drawings for sandwich panels 3A Composites Sandwich Panel System has high strength and light weight – the weight of a 100 mm is about 22 kg/m 2, which is much lower than a traditional concrete wall. MW ROOF sandwich panel (MW-R) Core: Rigid mineral wool (nominal apparent density: Panel weight [kg/m 2] 20. Apr 19, 2023 · Different Thickness Ratios in Sandwich Panels 25mm Panels . Roof sandwich panels consist of a steel sheet on both faces with a core of polyurethane foam that provides great thermal insulation. Light for 1 Applications. PU panel: Polyurethane sandwich panel. QuadCore KS1000RW Roof Panel is a through-fix insulated roof panel. Sandwich panels Weight [kg/m 2] 10. Pflaum® FO is also called Taranos We offer a wide variety of easy-to-fit, low-maintenance, high-performing insulated roof panel systems. Available in width of 1000 mm and in lengths of up to 29 m (depending on width), allowing for fast track and cost effective installation. The exeptional thermal performance of our high quality panels lies in the physical properties of the polyuretane rigid foam and in the tightness of joint technique. At 25mm thick, these panels are most commonly used for lightweight applications such as caravans, trailers, or horseboxes. 46 2. Kingspan's engineered roof panel joints provide protection from wind, rain and moisture and allow aesthetic integration of different profile types. 3: 30. O. Sandwich panels are assembled roof and wall elements that have excellent insulating characteristics. The panel provides versatility given its design options and functions as either a wall or roof for various commercial and industrial applications. It’s composed of three (or sometimes more) materials, forming a composite panel that is adhered together to create one coherent structure, enhancing the building’s overall energy efficiency and mechanical properties. 6 and 1. 5%) – for roofing made of a single panel installed along the pitch, Sandwich Panels. Sandwich panel are composite material that consist of polyurethane filling materials between two sheet. Products. based in South Korea, renowned as Asia's No. 65: 12. Introducing SY Panel Nepal Ltd. Standard Packing – Sea Transportation. The ability to regulate temperature makes them ideal for creating energy-efficient buildings, reducing heating and cooling costs. Topway® Steel PUR Insulated Panel (Roof) TW1000W are stacked top side to the bottom side. Oct 13, 2020 · EASYWALL Light Weight Panels; Follow us on: Sales (+971) 4 887 8463 Main (+971) 4 885 0474; Contact Us; Home; Sandwich roof panels are very durable and tough Light weight purlins for roofs Wall and roof structure references. In comparison, a solid wall with 24 cm thick masonry and 2 cm plaster walls has a U value of 1. 4 10. ROOFING PANEL SYSTEM 3AC SPS Roof Installation System SPS Roof Panel Roof Purlin (By others) Saddle-shaped Cap EPDM Strip ST5. ThermHex is a strong & lightweight material that provides optimal performance in composite sandwich structures where superior mechanical performance is required. 1 Panel Manufacturer. Real Calamba City, Laguna Tel nos. L. It supplies in many countries, including India. The thickness of Izhar’s EPS sandwich panel range is 40-200mm. With their light weight design, sandwich panels are an excellent choice for constructing buildings in Kenya. With the filling consisting of non-combustible and environmentally friendly hard mineral wool, this sandwich panel ensures excellent fire resistance . 4 METAL SHEETS FOR SANDWICH PANELS PH Insulation manufactures panels with metal sheets that meet the specifications listed in table 1. GLAMET G5 A40 is Self-Supporting metal roof panels, insulated with PU/PIR rigid foam, for pitched roofs. Almanaa Metal Construction Company L. 5 9. Kingspan insulated panels are single-component, factory pre-engineered systems. Building Component Solutions. Panelpro roof sandwich panels are produced on a continuous double line production installation, which is in fact one of the most modern of its type. It is an improved strength model designed to withstand demanding conditions. PPGI PPAL PPGL STAINLESS STEEL Get complete range of the sandwich panel for roof and walls at EPACK prefabricated sandwich Panels manufacturer and supplier Company in India. Thermal Conductivity: 0. The materials used may vary depending on the sandwich panel’s purpose but ultimately this configuration should create a panel Assan Panel, the leading manufacturer in the industry, contributes to construction of sustainable and environmental-friendly buildings with a wide variety of products such as polyurethane panels, PIR and Mineral Wool panels ensuring fire safety, cold room, roof, and exterior wall sandwich panels, prefabricated panels ready for installation on solar systems, custom accessories for specific Sandwich panel nSPC W is available in thicknesses 140/100, 160/120 and 190/150 mm. Our products include roof, wall, ceiling and patio systems, skylights, panels lights and recess lights. An integrated tongue is included for panels 100 mm thick . By investing in a Qatar Steel Industries Factory Double Skin Sandwich Panel, you Make sure the screw used for EPS sandwich panel roof must be with rubber seal, and stainless steel washer. Sandwich PUF Roof Panel is made by injecting Polyeurathane in between the top sheet and bottom sheet. . LTD. Thicknesses of Sandwich Roof Panels and Sandwich Wall Panels to be used for the roof and walls of your building based on the types of insulation range from 40 mm to 200 mm for the PUR/PIR insulation type, 50 mm to 150 mm for the Mineral Wool insulation, and 40 mm to 150 mm for the EPS insulation. The panel is made up of a Corrugated CGI,PPGI or S-Span Sheet at the top and a plain corrugated sheet at the bottom. Our insulated sandwich roof panels which have TSE, CE and TSE EN ISO 9001:2008 quality certificates that you can use on your industrial buildings, commercial buildings, power plants and residental buildings. 7 10. 45x250 sandwich roof panels manufacturer & supplier Globe Metals offers a wide range of roof panels according to your needs. Mar 10, 2017 · Depending on the necessary characteristics, mineral wool of various density is used in the sandwich panels structure: low density (less than 90 kg/m 3) – for internal partitions, medium density (95-115 kg/m 3) – for external walls and roof panels, or increased density (120 kg/m 3 and more) – for fireproof partitions and wall panels having Polyisocyanurate Sandwich Panel (Wall). ting sandwich panels are: high mechanical strength, excellent thermal insulation properties, high tightness of wall and roof panel joints against heavy rain, high air and vapor tightness of wall and roof panel joints, easy and quick installation, proportionally low investment cost, compared with classic building methods, The TRP 45/150 is a trapezoid formed roof panel, through-fixed on the side-lap joints. Rockspan Roof is an external insulated sandwich roof panel with a through-fix joint detail that enables simple and fast construction. 4 - 0. GLAMET Sandwich panels , both face are made with Zinc Aluminum Alloy coated sheet , which act as united structure with rigid foam core providing strength than other traditional roofs. Sandwich panels are comparable to an endless I-beam in the sense that when subjected to bending, the flanges carry in-plane compression and tension loads while the web carries shear loads. Panel Width is 1000 mm. Developed over 20 years ago this engineered all-in-one insulated roofing solution offers a ceiling, insulation and roof sheet in one product for optimal thermal and build efficiency when RAY-CORE SIPs ™ Staggered Stud 2x6 (5 ½”) x 8 ft. Effective insulated sandwich panels require a robust, reliable and quality core material. in +918130444466 PUR/PIR insulated roof sandwich panels put forward together aesthetic and smart solutions for your buildings credit to its sandwich roof panels manufactured at desired lengths ranging from 1-12 meters, in thicknesses ranging from 35-100 mm and in a broad range of colors. 333. 84: 11. Box 14441, Dammam 31424 Saudi Arabia Phone: +966 (13) 812 4571/72 Email: It is home to durable Insulated Sandwich Panels (PU/PIR). They include: Roof panels installation 12 13. Learn More about how RAYCORE Structural Insulated Panels ® compare to Sandwich Panel Structural Insulated Panels. TEMPCON Sandwich panels. Not a bad way to speed up construction. 82 2. 5/0. Water absorption: 2. Profile of the exterior surface of roofing sandwich panels (PRT Z) Diagram 11. estrictions may apply for non-standard lengths. This particularly option is popular for projects in areas where there are extreme weather conditions: extremely hot and dry, extremely cold and very wet TSP 45/250 is a corrugated (profiled) insulated sandwich panels with high structural rigidity which can be used for roof and wall applications in warehouses, industrial, commercial and agricultural facilities. However, our specialists also become an extension of customers’ operations, working with (OEMs) and sandwich panel manufacturers to innovate stone wool insulation solutions. The sandwich panel widely used as roof, wall and garage door in modern construction specifiers go to the sandwich panel due to high standard in thermal insulation, quick and easy installation and variety of colors. A scratch-resistant surface that is coated up to 1500 gms. Our sandwich panel is certified for its Reaction to Fire performance according to the European Standard EN 13501-1 with classification: B-s3-d0 (Watch below the video of the test which was performed by Exova Warringtonfire UK) Sep 20, 2023 · Balextherm PU-R roofing sandwich panel with a polyurethane core Products. Application: Ceiling and surround See our range of sandwich panels and accessories on our website https: Weight (kg/m2) 12,10 12,90 LOADS TABLES OF THE COLD STORAGE ROOF PANELS . Roof and wall installation. C. Manufacturer of PUF Panel - Kakade Sandwich PUF Panel, Sandwich Insulated Puf Panels, PUF Sandwich Panel and Puf Sandwich Roofing Panel offered by Kakade Industries, Pune, Maharashtra. FALK pitch roof panels are designed for roof slopes greater than 0. Sandwich panels with coated steel armouring on both the external and internal sides and with a heat insulated filling (polyurethane or mineral wool with higher specific weight) are The main differences between the materials are their thermal insulating performance, sound insulating performance, fire resistance, and weight. The density of Izhar’s EPS sandwich panel range is 12-20 kg/m3. Pitched roof panels. Panel Is Easily Handled By One Man and Weighs Only 78 Pounds! For More RAY-CORE SIPs ® vs. Dana is a well-known company when it comes to sandwich panel roofing sheet producers. 4-0. Wall Panel accessories i Feb 7, 2022 · What is a Lightweight Sandwich Panel? A sandwich panel is a three-layer structure, with the two outside layers consisting of a thin, rigid material and the middle layer consisting of a thicker, lightweight material. The top, bottom, sides, and ends are protected with foam and timber packing, and the entire palette is wrapped with the protection film. Temperature range: up to 110°C. Box: 3479 Abu Dhabi Tel : +971 2 5513012 Fax : +971 2 5513020 Our QuadCore insulated roof panels are engineered for easy installation, low maintenance, and high performance. Sandwich PUF panels are widely used in the construction of prefabricated buildings. 1 10. enquiry@epack. The maximum length of each panel is 15 metre. Wall sandwich panels with EPS core are intended for applications in various kinds of buildings: industrial, commercial and Sep 18, 2023 · Installation Steps of Installing Sandwich Panel Roofing. Because of its construction, Bhagawaati Royal Roof sandwich panel sheets have an inherent advantage over normal panels used for roofing. 6: Topway® Steel PIR Insulated Panel (Roof The Thickness of panels ranges from 0. Thickness Specificaion: Top and Bottom Sheet: – 0. Insulroof® is an ingenious combination of corrugated roofing, insulation and ceiling in one durable, functional and attractive panel. The Weight. Manufactured by our sister company, Metl-Span, they are designed with the latest scientific breakthroughs, our panels are lightweight, durable and still maintain their ease At Panel Sandwich Group, we have been developing Standing Seam Metal Panels in our facilities for a few years using galvanized and pre-coated steel plates with the possibility of choosing the thickness between 0. 50%) 1 . Feb 28, 2012 · The characteristics of the panels are the following: thickness — 40 mm; length — up to 6 m; weight of 1 m2 с with 0,5 mm metal facing — 9,5 kg; Original pack contains 28 panels. Colour groups 17 15. Energy-efficient sandwich panels ENERGY 17 14. 41 150mm Panel 3. They are also quite popular for roofing in residential buildings. They are available in widths of 1000 mm to 1200 mm. We supply roofing panels (Composite sandwich panels for roof) in all colours and sizes from 3m - 25m in length. 3: 22. ROOF PANELS Balex Metal roof panels are the only sandwich panels in our offer capable of carrying increased loads, such as snow. 4 Steel: 9. 04 Width Coverage (mm) 1000 1000 Minimum Roof Pitch 1° 3° Core Material SL Grade EPS (expanded Mar 24, 2024 · Polyurethane Core Sandwich Panels. 40, . 6 75mm Panel 9. Suitable for use in all buildings with roof slopes as low as 3 o (5. Bhagawati Royal Roof sandwich panel sheets are available thickness ranging from 30 to 120 mm. Guidelines for the application of dark col- weight-surface The roof panel KS1000 FF with trapezoidal external face profile is an exposed fastening panel with mineral wool insulated core K-Roc®. Visit our page for more information! Mammut Structures and Panels Company started its activity in the field of manufacturing various types of sandwich panels in 1991 and now, after 3 decades of continuous activity in an area around 2,000,000 square meters, is known as the most specialized manufacturer of various types of sandwich panels for roof and wall, clean rooms, cold storages, residential and workshop portable cabins, steel LS-36™ Insulated Roof and Wall Panel. Any combination of profiles can be selected, however, the Micro Rib finish can only be done to one facing of a panel, with the other facing being any of the other 5 profiles. Modern sandwich panels are a construction consisting of three layers, which additionally use thermal insulation, which is located between two profiled sheets. Thermano thermal insulation. The DPR roof panel is used for external roofing. . On average, a sandwich panel with a thickness of 50mm - 100mm and made Nucor Building Systems offers a full line of insulated metal wall panels and insulated metal roof panels that embody attractive styling and cutting edge energy efficiency. Roof sandwich panels types: ☆ Concealed joint roof panels with 3 ribs: Ou r sandwich panel is produced according to the European Standard EN14509. The weight of the roofing sandwich panels is 12-38 kilogram, depending on the thermal insulation layer used. 73 4. Connection of sandwich panels to each other. Sandwich Panels are Similar to I-Beams. is specified on panel utilised in external cladding. 10 3. Tempcon sandwich panels (TCSQ) that are produced using rigid Polyisocyanurate (PIR) foam core with external and internal sheet in steel or aluminum and profile of outer skin is Type-S1 & profile of inner skin is Type-Q. 4. It is also possible to connect BALEX METAL roof panels with skylights - both along the width and length of the roof. These panels come in various thicknesses, including; 40mm, 50mm, 75mm, and 100mm thickness May 6, 2021 · About Sandwich Panel Roofing Sheets. This is possible thanks to the trapezoidal sha-pe of the upper cladding. 4: 25. Weight kg/m² 0. Roof sandwich panels PU have stiffening ribs on one side, installed as special protrusions in the form of usually a trapezoid. 50mm Panel 9. EASYWALL™ panel is manufactured using light weight concrete with EPS (expandable polystyrene) as core between two fibre cement boards. 2 nd Industrial City P. TCSQ panels are suitable for roof and wall of all building applications. The business was established in the United Arab Emirates. 2. Step 1: Preparation: Ensure that the roof structure (trusses or supports) is properly installed and aligned. Thanks to its assemble process and compasition, a Bondor® has been the market leader and driver of innovation and change in the Australian insulated panel sector for over 65 years. Wall and roof locks differ significantly. 5 150mm Panel 10. All lengths may ch. QuadCore® KS1000RW Roof Panels are through-fix, trapezoidal profiled, insulated roof panels which can be used for building applications with roof pitches of 4° or more after deflection. 1000 mm cover width. The steel of Izhar’s EPS sandwich panel, be PPGI or galvalume steel ranges from 0. M42 Plot 92, 93 Mussafah Industrial Area P. Delta Panels is a 100% Australian owned and operated Brisbane manufacturer of insulated panels. Skylights should be EPS Sandwich Roof Panels 50mm Kes 4500 (Box Profile) EPS Sandwich Roof Panels 75mm = Kes 4900 (Box Profile; Sandwich prefabricated panels are a cost-effective and durable way to construct walls, roofs and even floors in Kenya. Available Lengths. The exterior skin of pre-painted coated sandwich roof panels has a thickness of . Corrugated Insulated Panels. Main Plant and Head Office Bacnotan Drive, Brgy. Our panel solutions include a full range of roof accessories from posts and beams to flashings and fixings to LED lights and skylights. 8mm. 297 W/(m K). The assembly of the 5 Ribs Sandwich Roofing Panel is extremely simple: the panels overlap each other thanks to a system of wings and are fastened to the structure with self-drilling screws that incorpórate a special cappellotti or washer with neoprene gasket that prevents water filtration. Manufactured with a stone wool core, the panel provides reaction to fire performance of A2-s1, d0 when tested and classified to BS EN 13501-1:2018 and specified with Colorcoat Prisma® by Tata Steel. With 80 mm thick sandwich panels with polyurethane rigid foam, the U value is 0. The best sandwich panels in the industry have a high-density polyurethane core sandwiched between galvanized or aluminum corrugated core. Sandwich panels are interconnected with locks. The weight of sandwich panels per square meter produced by polyurethane sandwich panel production line can vary depending on several factors such as the thickness of the panel, the type of core material, and the type of facing material used. As you can see, quite a decent bearing capacity. 42 75mm Panel 1. 50, and . 2 125mm Panel 10. 85 W/(m K). Sandwich Panels SIPs Comparison. DURABILITY: The system is designed to withstand harsh conditions and comes with a 10 year warranty. It can be used in all building types where the roof pitch is: • greater than 5° (8. Sandwich roof panels up to a length of 25 meters and a weight of 800 kg can be easily installed, flat or inclined. 6: 28. Recently, Bondor® has taken this experience and applied it to wider market opportunities developing a range of light weight structural insulated panels for wall, roof and architectural applications using proven core material technology, that is tested and Mar 21, 2023 · Sandwich Panel Weight Per M2. This lifter (equipped with a single- or dual-circuit safety system) is suitable for the installation of horizontal and vertical sandwich wall panels up to a length of 14 meters or weight of 800 kg. They consist of two thin Steel Sheet Facings, which are shear-resistant and are bonded to one another on an insulated core. EPS panel has lighter density compare to Panels for Building Construction : See load chart: ASTM E1592: Structural Performance of Metal Roof and Siding Systems by Uniform Static Air Pressure Differences: See Load Chart: FM 4471: Class 1 Exterior Roof Structural Performance: See FM Roof Load Chart: UL 580: Uplift Resistance of Roof Assemblies: UL Class 90 Uplift at 5′ and 7′ UL Insulated roof panels are weather-sealed and provide a strong thermal and moisture barrier. 4: 10. 9: Heat transfer coefficient, U √ Excellent waterproof performance among all the sandwich panel roof; √ Because PU core material is solid,it leads the high strength for panel; √ Yumisteel can offer full set of installation and construction guidance. White Metal Contracting LLC supplies and provides solutions to your sandwich panel needs like external walls, internal walls, ceilings, and roofing. 8: 10. High Thermal Performance. Partnering with ROCKWOOL Core Solutions 1 offers exactly that. 6 mm, the added foam crest thickness is 30 mm and the foam thickness itself ranges from 40 - 100 mm. In the most basic terms, a sandwich panel is a unique, high-performing panel type, used in the construction of industrial buildings. This makes it possible to make not only walls and roofs from sandwich panels, but also ceilings. 60mm, with a length of 1000 meters. It is a perfect solution for roof construction, combining high quality with very good technical properties . Globe: +63917 503 3965 Smart: +63919 003 2303 Aussi Panels proudly supply 100% Australian made Insulated Roof and Wall Panels, Patio Kits, Carport Kits and more. Table 1. 60mm thick. TSP 32/366- PIR Insulated Roof & Wall Panel; TSP 35/205- PIR Insulated Roof & Wall Panel; TSP 45/150- PIR Insulated Roof & Wall Panel; TSP 45/250- PIR Insulated Roof & Wall Panel; TSP 45 / 250 -ROCKWOOL; TSP 42/206-Roof Tile Insulated Panel; Architectural Wall and Roof Sandwich Panels These panels are widely used for roofing, wall cladding, and flooring due to their exceptional insulation properties. At SY Panel Nepa l, we specialize in producing high-quality EPS and PUF sandwich panels, offering intelligent and innovative building solutions. Sandwich Panel for Roof And Wall. The most common metallic facings of sandwich panels is PPGI (Pre-Painted Galvenized Iron). 40 mm to 0. Cold store sandwich panels ARPANEL CH PUR/PIR L/100 Wall sandwich panels ARPANEL S MiWo L/100 Roof sandwich panels ARPANEL D PUR/PIR (temporary loads) L/200 Roof sandwich panels ARPANEL D PUR/PIR (long-term loads) L/100 This is how our system of symbols works! thickness of the core ARPANEL S - wall sandwich panel – standard fastening system 3A Composites Sandwich Panel System has high strength and light weight – the weight of a 100 mm is about 22 kg/m 2, which is much lower than a traditional concrete wall. PUR/PIR Insulated Sandwich Roof Panels (Required Areas): Insulated sandwich panels provide an aesthetic appearance to the building with superior thermal insulation and resistance to fire spread. 5 Self-Tapping Screw with Hat Roof Secondary Purlin Butyl Tape Overlap > 250 mm ST5. 25:12, making them a versatile choice for a wide range of buildings, including barns and industrial facilities. 8 R Value (m2K/W) at 14°C mean temp. 021 W/mK. 5 Self-Tapping Screw Panel Module Width Saddle-shaped Cap EPDM Strip Roof Purlin (By others) SPS Roof Panel Panel Module Width 3A RAYCORE’s Insulated Roof Panels and Insulated Wall Panels are far superior than other SIPs with highest R-value custom blend of polyurethane foam insulation wrapped in a foil radiant barrier and producing a superiorly strong, lightweight, do-it-yourself DIY friendly SIP Panel. Our technology has led the industry in thermal-efficiency, fire safety and lifetime durability. 24 1. The standard wall panel thicknesses are 75mm, 100mm, 150mm, 200mm, 250mm and 300mm and produced as single solid wall panel, cavity panel, twin panel and insulated panels. 90 mm of the Insulated Roof & Wall Panels. 77 125mm Panel 3. Largest Manufacturer and least expensive SIP Panels on the market! Dimensions of Sandwich Panel: Top Skin Detail: 35/200 mm & GMI 45/250 mm Thickness: 50mm Covering width: 1000mm. Most of our lightweight panels incorporate ThermHex – a revolutionary Polypropylene honeycomb core. 30 to . panel thickness for insulation t, mm: cladding thickness, mm: Pflaum® FO is a visible fixings insulated sandwich panel with a core made of high density mineral wool and prepainted steel facings for wall application. Their sandwich wall panel has a length of 1150 meters with a PIR core of 40 Union Galvasteel Corporation. The complete high-performance, low-energy building envelope. Heat engineering characteristics of a wall made of 40-mm sandwich panels are equivalent to: 600-mm thick brick wall. Our Sandwich Panel dimension: Top Skin Detail: GMI 45/250 mm & GMI 35/200 mm Detailed information on specs and surface make we supply in Dubai and full GCC, click here: Sandwich Panel Jun 3, 2020 · SANDWICH PANEL METALLIC FACING Internal and external facings of a sandwichpanel are determined according to the type of usage of the panels, type of the surronding enviroment and the loods affecting on the sandwich panel. The LS-36™ insulated, exposed fastener metal wall and roof panel achieves unmatched insulation values. 8 9. mt tp jm xy vs uh qd nd tg dz