Precast Sandwich Panel Supplier

  • Fast delivery 4-7 days
  • With fire retardant B1 fire rating
  • PPGI steel or Galvalume steel skin 0.4-0.8mm
  • Thickness 40-200mm
  • Competitive Price

Sunnyda- Modern and Innovative Manufacturer and Supplier of Precast Sandwich Panel.

If you want to protect your building structure from storms, twisters, heavy rains, heat, and sound, then Precast Sandwich Panel by Sunnyda is the best option. Whatever the construction of your building, it protects your building from different temperature parameters.

With the introduction of edge, Sunnyda provides our clients with a Precast Sandwich Panel that satisfies the market demand for edge-to-edge protection, as well as two load-bearing appearances and a high level of warm execution.

Our expanded assembly capabilities provide you with additional options, flexibility, and precast execution.

Now, Sunnyda presents U-values and R-values of up to R-26.8 are available on our panel. Our panel specifications can reach heights of 75 feet and grow, with panel widths of up to 15 ft. 5.5 in. depending on the plant of origin.

Thermoplastic polymer attachments aid in the creation of the panel’s composite strength.

Edge is the fitting complement to our company’s other precast panel, allowing you to create a mixed envelope with R-value specific zones that are best suited for individuals, stockpiling, or assembly.

Sunnyda is a modern and innovative manufacturers and supplier of Precast Sandwich Panel with good quality of product and 100 percent assured customer service.

Furthermore, because of the reduced precast board weight, a three-board load is virtually guaranteed, saving time and money in the process.

So, visit Sunnyda, you can ask for samples. Then, after your satisfaction, you can place your order. But don’t forget to provide every detail of your product so that your product can manufacture perfectly.

Panel Thickness

Panel WeightKAverage Sound Insulation(bd)

Max. Span At Load 50kg/m2


KgW/m2 0C

Kcal/m2 h 0C










Color EPS steel sandwich panel

Surface s colored steel sheet, core material is self-extinguishing polystyrene. It is continous heated and pressured in molding machine, then composited by the heat-curing adhesive. Its very light, 1/20-1/30 equivalent weight of concrete, keeping warm and insulating heat, its heat transfer value is 0.034W/mk. Easy to install. It’s new material with all the advantages of weight bearing, warm keeping, waterproofing, decoration.


Ceiling and surround for clean factory, workshop for clean products, warehouse, cold room., long span panel, reinforcing the original structure, temporary office, shop, market, koist.


1, Fire rating: B1

2, Thickness: 50mm, 60mm, 75mm, 100mm, 120mm, 150mm, 180m, 200mm

3, Width:  Wall-1200mm (effective 1150mm), 1000mm (effective 950mm), Roof- 1000mm (effective 980)

4, Length: no limited, recommend less than 11.85m fit for 40HQ

5, Steel thickness: 0.4-0.8mm

6, EPS density: 12-20 kg/m3

7, Surface: Wall flat or groove, roof corrugated

8, Joint: Tongue and groove

9, Paint: PE, PVDF, HDPE, SMP, RMP

10, Color: Any RAL color

11, Delivery: 4-7 days

12, Production capacity: 3500m2 per day

13, Free sample

Sunnyda Support Your Business

Precast Sandwich Panel- A Complete Guide to your Strong Building by Sunnyda.

Precast Sandwich Panel is the best option for any building structure. It contains concrete cement layers, which may help prevent fires, termites, mold, and deterioration and provide efficiency and long durability.

It contains three layers with connections and surface finishes.

Different Precast Sandwich Panel can be linked to achieving multi-story construction with the proper underlying considerations.

For your ease, this guide presents you Precast Sandwich Panel’s manufacturing, installation, essential measurements, different core materials and their composition, various suitable connectors, and test external connectors. Let’s begin.


1.What is Precast Sandwich Panel?
2.What is Core Material used in Precast Sandwich Panel?
3.What is the Composition of Precast Sandwich Panel?
4.What are the Specifications of the Precast Sandwich Panel?
5.What are the Different Categories of Precast Sandwich Panel?
6.What are the Features of the Precast Sandwich Panel System?
7.What are the Uses of Precast Sandwich Panel?
8.What are the Advantages of using Precast Sandwich Panel?
9.What is the Manufacturing Procedure of Precast Sandwich Panel?
10.What is the Dimension of the Precast Sandwich Panel?
11.What is the Installation and Transportation of Precast Sandwich Panel?
12.What is the Meant by Thin Precast Sandwich Panel?
13.What is the Thermal Efficiency in Precast Sandwich Panel?
14.What are the Different Connectors used in Precast Sandwich Panel?
15.What kind of Fiber Reinforced Polymer Connectors used in Precast Sandwich Panel?
16.What is the Load-Bearing Precast Sandwich Panel?
17.What is the Non-Load-Bearing Precast Sandwich Panel?
18.What is the Composition of Different Concrete Wythes in Precast Sandwich Panel?
19.What Kind of Testing Methods Used in Precast Sandwich Panel?
20.What is Meant by Surface Finishes in Precast Sandwich Panel?
21.What is the Cost Estimation of Precast Sandwich Panel?


What is Precast Sandwich Panel?

Precast Sandwich Panel is a precast cladding distinguished by strong heat resistance provided by an insulative layer.

It has an insulative layer sandwiched between two cement wythes and secured with mechanical connectors.

It is typically made of steel-supported cement with thicknesses exceeding 320 mm and associated loads of 545 kg per m2 of partition area.

Precast Sandwich Panel’s weight and thickness must be reduced for them to be helpful in a broader range of buildings.

As a result, several recent projects and considerations have focused on designing for more thin segments.

They are designed over traditional cladding materials, including fire resistance and the solidity of cement.

Precast Sandwich Panel may be projected at any scale, allowing for a more extensive façade covering fewer joints and more significant vertical gaps between upholds than conventional façade frames.

They’re most commonly used in low-rise mechanical buildings, but they’re increasingly being used in a broader range of building types, from mid-rise to skyscraper private and corporate structures.


What is Core Material used in Precast Sandwich Panel?

Some of the typical insulation core materials used in Prefabricated Sandwich Panels are:

  • Expanded Polystyrene (EPS)
  • Extruded Polystyrene (XPS)
  • Polyurethane (PUR)
  • Polyisocyanurate foam (PIR) (a modified redesign of PUR)
  • Phenolic Foam (PF)

Insulative core material depends on (conductivity) Ki values for Precast Sandwich Panel are:

  • Vacuum Insulation (VIPs):

Vacuum Insulation has a conductivity that is hundreds of times lower (0.069 W m1 K1) and thus makes a particularly desirable arrangement for Precast Sandwich Panel.

They are suitable when the overall Layer thickness is limited.

  • Foamed Concrete (FC):

The FC used for the underlying wythes is thicker and has a higher compressive strength.

However, when used as an insulative layer, it must have a low conductivity ranging from 0.05 to 0.07 W m−1 K−1 and, as a result, a standard thickness.

  • Mineral Wood:

Mineral wood has conductivity varies from 0.04 to 0.05 W m1 K1 depending on the kind.

Thus, in terms of conductivity, it’s comparable to conventional froth-based Insulation.

Due to lack of hardness, heap movement in mineral wood between the two cement wythes is entirely dependent on the connections.


What is the Composition of Precast Sandwich Panel?

The three layers of the panel are as follows:

  • A non-loadbearing precast cement layer with a decorative treatment for replicated stone on the exterior (often 80mm).
  • An inward layer of loadbearing plain dim cement (100 to 200 mm) with a force drift finish is used for direct composition (ideal).
  • An insulation layer is inserted between the external and internal layers to meet the ‘U Value’ criteria.

The two layers of the sandwich board can be connected using tempered steel or plastic connections, which allow the exterior layer to move freely within its plane.

The board’s interior layer should be load-bearing to support floor units and complete the structure.

They come in a variety of widths, lengths, thicknesses, and outside wrapping.


What are the Specifications of the Precast Sandwich Panel?

Some of the current specifications of Prefab Sandwich Panels are:

  • A significant development in Precast Sandwich Panel configuration has occurred recently due to this warm effectiveness potential and the resurgent significance of precast cement in general.
  • Lighter and thinner cement wythes are designed for new elite cement and unique support systems.
  • Various novel fiber-based polymer connections are developed and examined in their structure to operate with shear load transfer between layers while also allowing minor heat loss.
  • For delicate division manufacture ups, cutting-edge low-conductivity protection improvements contemplate remarkably low U-values.
  • They may also be designed to transport the dead heaps of construction components above these heaps bearing panel require extra strength to withstand the various load situations and various designs and test techniques.


What are the Different Categories of Precast Sandwich Panel?

Different categories of Precast Sandwich Panel depend on bending and are categorized as:

Composite Precast Sandwich Panel:

The two cement wythes work together to resist twisting in a composite Precast Sandwich Panel.

The base and top wythes work together to prevent twisting on a fully composite panel.

To do this, the connections connecting the two cement wythes should allow for horizontal load movement.

Non-Composite Precast Sandwich Panel:

The two wythes act freely to fight the applied loads in a non-composite Precast Sandwich Panel.

The wythes are considered as independent components in the non-composite panel plan.

By conceding that the heap is distributed in proportion to the bending firmness of each wythe, the twisting second limit is established.


What are the Features of the Precast Sandwich Panel System?

Some of the advanced features of the Precast Sandwich Panel are:

Energy Efficient:

Precast Sandwich Panel differs from other cladding options in that they may achieve significant heat obstruction (energy efficient).

In Europe, the warm conveyance, U-esteem (W m2K1), is used to assess the panel’s friendly presentation.

In contrast, in the United States, the warm obstruction, R-esteem (m2 KW1), is used for the panel’s warm production.


New Precast Sandwich Panel is made of a thin panel to avoid consumption, which concerns steel support regulating the cement base thickness regularly in Precast Sandwich Panel.

The thin panel uses polyurethane foam and steel sticks to get top underlying execution and relies heavily on the link between the significance and protection.

Flexural Behavior:

The separate panel’ bending second limitations per meter width of divider (kNmm1), a flexural behavior can be calculated. Four-point bowing is used in the majority of flexural tests.

However, Pinnacle load bowing second limitations have been announced, ranging from under six kNmm1 to above 82 kNmm1, which its flexural behavior can calculate.

For a 3.3 m high board, a 1.8 kPa plan wind pressure would result in a twisting snapshot of 2.61 kNm per meter width of the divider.

Others Features:

The inherent longevity, lightweight, sound-proof, highly efficient, and fireproof are Precast Sandwich Panel’s basic features.


What are the Uses of Precast Sandwich Panel?

Some uses of the Precast Sandwich Panel are:

  • Steps, holding dividers, walls, light shafts, cellar dividers, and chunks of precast cement can all be filled with it.
  • Precast Sandwich Panel can also provide a solution for the quick and transitory military building. This particular panel should be resistant to impact stacking and have been tested in this manner.
  • It’s also commonly used to construct storage sheds, cow feed bunks, boxes, channels, and holding dividers.
  • It has Hollow core panels are also available for use in the construction of walls and floors.
  • According to various specifications, they are used in every building, such as residential, commercial, and industrial.
  • Precast Sandwich Panel is used for a broader range of building types and enhancing the inherent benefits of precast cladding.

They may be able to provide a thermally efficient cladding solution for new constructions and act as a replacement cladding in the event of a redesign.


What are the Advantages of using Precast Sandwich Panel?

Due to inherent strength and attainable high-warm productivity, advantages of the Precast Sandwich Panel are likely

  • To lead to increased use of this cladding type in the future.
  • Lightweight boards, in particular, may be a challenging invention, providing material reserves, transportation, and on-site efficiencies.
  • Perhaps most importantly, they examine another type of energy-efficient external cladding, one that has the advantages of precast.
  • They may be able to provide a thermally efficient cladding solution for new constructions and serve as a replacement cladding in the event of a redesign.
  • In any case, additional study into the fundamentals and warm execution of the Precast Sandwich Panel, as well as the scope and techniques for their expansion, is required.


What is the Manufacturing Procedure of Precast Sandwich Panel?

The manufacturing process of the Precast Sandwich Panel is:

  • Begins with the wood/steel formwork’s ready.
  • After the steel support has been installed, the primary layer of cement is poured.
  • Reinforcing strands are placed and prestressed either before or after the concrete is poured if prestressed concrete is necessary.
  • The connections and protection are placed as instructed while the material is still wet.
  • On top of the protection, the last layer of steel rebar is installed, followed by the final layer of cement.
  • The exposed cement surface is polished with a scoop for a smooth finish or a brush for a rough finish, while the foundation surface is smooth formwork.
  • The panel is stripped, moved higher, and then pulled out of the formwork after being relieved.


What is the Dimension of the Precast Sandwich Panel?

Dimension can be estimated by formula:

C2 = h2   – c1

More minor strains and stresses demonstrate how a higher degree of composite action results in thinner wall designs for the same loading circumstances in Precast Sandwich Panel.


What is the Installation and Transportation of Precast Sandwich Panel?

The average panel size varies by nation, with various allowances for unaccompanied transportations.

If the height, breadth, or weight of a vehicle exceeds certain restrictions, special permissions are usually necessary for transportation and installation.

In the United States, for example, the maximum permitted width for unescorted transit is 3.8 meters

Precast Sandwich Panels are typically transported on their edges, so be careful to avoid chipping and spalling.

Without proper thought and consideration, damage usually necessitates constant installation work, or perhaps entire remaking of the damaged panel.


What is the Meant by Thin Precast Sandwich Panel?

Thin Precast Sandwich Panel results for space and weight savings, as well as on-site efficiencies and material reserves.

Lessening thickness is a challenge because comparable warm and main requirements must be met for the panel to function as a safe and effective cladding component.

Non-destructive support, low conductivity protection, and composite activity can all be used to create a thinner Precast Sandwich Panel.

Precast Sandwich Panel uses unique conductive insulation material like vacuum insulation.

Several studies supported these techniques for reducing panel thickness and weight while ensuring high underlying and warm execution.

These include the method of lifting and shipping the board and the panel’s capacity for safety from fire.

Lifting eyes or bolts are often projected in for raising reasons. Therefore, the thickness is defined by the least widths of these bolts.

Because of the burden-bearing component, the issue of fire resistance is highly pertinent.


What is the Thermal Efficiency in Precast Sandwich Panel?

Precast Sandwich Panel differs from a traditional supported significant divider in that it has an internal protection layer that provides warmth protection from the structure.

The thermal efficiency of the substantial layer is significantly lower than even the protection, and the panel’s thermal efficiency is overwhelmed by the insulating blockage.

The U-values found for the Panel designs, for example, are identical, although the overall thickness varies by 84 mm. This is because the types of protection and thicknesses vary.

Precast Sandwich Panel, surprisingly, would not comply with existing Irish structural requirements, which call for a minimum U-worth of 0.19 W m2 K1 for new homegrown buildings and 0.24 W m2 K1 for new non-homegrown structures.

Only two of the panel were recorded to satisfy the requirements for passive houses (of 0.18 W m2 K1 or better).


What are the Different Connectors used in Precast Sandwich Panel?

The connectors link the insulating layer and the other two structural layers to provide a shear load between layers. Connectors that are used in Precast Sandwich Panel are:

Concrete Connectors:

This large number of concrete connections causes a crucial thermal efficiency crossing over, alleviating the Precast Sandwich Panel’s heated blockage.

Three wythe Precast Sandwich Panel with staggered layers of protection and large zones have also been tested mainly and thermally.

Still, these three wythes over-complicate the assembly interaction and don’t fundamentally increase the warm exhibition.

Metallic Connectors:

Metallic connections were used to produce significant connectors to reduce the space of protection spanned by the connector.

Because of their high warm conductivities, metallic connections produce significant generous extensions over the protective layer.

If composite activity is desired, they are now available as support, cylinder, plate, or discrete pin-type connections if no mixed action is expected.

These metallic connections are included in the package.


What kind of Fiber Reinforced Polymer Connectors used in Precast Sandwich Panel?

Fiber Reinforced Polymer connectors are composite materials of a polymer network with filaments injected into it.

These connectors are made from non-metallic fiber reinforced polymer materials.

These composite materials are fundamentally variable, and as a result, their characteristics change.

Some of the Fiber Reinforced Polymer connectors that are used in the Precast Sandwich Panel are:

Carbon Fiber Reinforced Polymer Connectors:

Carbon Fiber Reinforced Polymer (CFRP) has been increasingly common in the precast significant sandwich board business as of late.

Due to its resistance to consumption, high strength properties, and fairly low warm conductivity, it was due to its resistance to consumption.

The matrix-type connections’ low compressive strength indicates that the protection is reliant on compressive resistance as a component of a crossover protection connector support structure that, in turn, provides composite activity to the panel.

Glass Fiber Reinforced Polymer Connectors:

The heated crossing-over steel bracket was known to be replaced by GFRP.

Thicker connections with more conspicuous insertion had a higher most severe shear stream, but there was no significant difference in shear conduct across the three protection types (XPS and EPS).

Basalt Fiber Reinforced Polymer Connectors:

Compared to CFRP and GFRP, Basalt Fiber Reinforced Polymer (BFRP) is a relatively new material for usage in Precast Sandwich Panel connections.

Under shear stacking conditions, flexural tests present a discrete ‘X’ shaped BFRP connection, and it provided more exceptional shear resistance than standard pin-type GFRP connectors.


What is the Load-Bearing Precast Sandwich Panel?

A Precast Panel is required to transport the load of the dividers and floors above, known as the Loadbearing Precast Sandwich Panel.

The load is transported higher to an institution.

The panels are fire-resistant and robust, and they provide an energy-efficient alternative for external walling.


What is the Non-Load-Bearing Precast Sandwich Panel?

Non-Loadbearing Precast Sandwich Panel do not carry the load of another structural segment.

Non-loadbearing Precast Sandwich Panel can be thinner than loadbearing boards as a result of this.

This panel is typically supported at each floor level by help at either the top or bottom of the board, which is used to move the board’s self-weight to the basic design and a restriction at the opposite end.

It provides overall strength romanticized as a fundamentally upheld pillar from one store to the next.


What is the Composition of Different Concrete Wythes in Precast Sandwich Panel?

Both structural layers are usually constructed using the same type of cement. Therefore, the correlations between various Precast Sandwich Panel in writing are primarily based on the different forms of Insulation and connectors.

Different cement compressive characteristics are accounted for throughout its structure, ranging from 10 MPa for lightweight frothed concrete to 196 MPa for UHPC.

Almost no investigations immediately consider the display of a sandwich board with several cement mixtures. However, the significant mixes’ compressive and elastic properties are helpful.

Precast Sandwich Panel have been made from different kind of concrete layers like

  • Ordinary cement (NC)
  • Foamed cement (FC)
  • Self-compacting cement (SCC)
  • High-performance cement (HPC)
  • High-performance fiber reinforced concrete (HPFRC)
  • Glass high strength concrete (GRC)
  • Flexural behavior concrete (RPC)
  • Ultra-high-performance cement (UHPC)


What Kind of Testing Methods Used in Precast Sandwich Panel?

Many experimental and hypothetical test procedures were used to examine the exhibition of the Precast Sandwich Panel. The tests that use the various methods are also documented.

Some methods are used to know the performance and conductivity of the Precast Sandwich Panel.

Two basic methods are:

Flexural Tests:

All cladding components are subject to wind-induced flexural stacking.

Consequently, the majority of Precast Sandwich Panel researchers have focused on flexure testing of this panel. Twisting tests of three points, four-point, and six points are all standard.

These tests should be achievable with conventional lab equipment (dislodging sensors, load cell, water-driven jack, test outline).

Shear Tests:

A board with more composite activity has a more significant global bowing second limit and firmness than one with the same material and calculation but a connection that doesn’t even accomplish the same degree of tensile mobility and, as a result, composite energy.

Numerous researches have looked at the relevance of the shear stream between the two wythes in this way.

A thorough examination of the behavior of ten various connection configurations had been carried out.

There are finding that normal strength varies between 5.8 and 16.4 kN for discrete connectors (such as pins) and between 5.3 and 16.4 kN for composite connectors.


What is Meant by Surface Finishes in Precast Sandwich Panel?

A broad range of surface finishes completions are available in the same way that formwork is completed.

Engineers commonly use precast cladding these days because of the accuracy, homogeneity, and stability it may provide in a precast industrial structure.

Precast Sandwich Panel, like single skin concrete, can benefit from these finishes.

Surface finishing medications are used on new and hard concrete (for example, water washing, brushing, sand projecting, and block faces) (such as corrosive carving, sand impacting, cleaning, and power brushing).


What is the Cost Estimation of Precast Sandwich Panel?

The cost is different in different aspects.

Per Square Foot:

The average cost per square foot might be anything from $8 to $16.

Precast suppliers can cost anything from $45 for each square foot for a 17-foot length to $98 for every direct foot for a 30-foot range.

Cubic Yard:

If the customer hire charges by the cubic yard, total positions, including the prepared mix, rebar, mastic, and work, can vary from $280 to $420 per cubic yard.

For example, a four-cubic-yard project may cost upwards of $2,100 to complete.

These are only the material costs; they do not include labor.



Today, advancements in cement and protection materials and the underlying procedures for the wythe association are pushing new designs in the Precast Sandwich Panel, particularly those that are more slender and lighter.

Before using Precast Sandwich Panel, you should choose novel cement, such as super superior fiber-built up and material supported cement, which has enabled more thin segments by substituting non-destructive alternatives for strong steel support layers.

Then choose the best supplier of your product and settle down the financial bills like the product, transportation, and installment costs.

Please follow the instructions written in the guide and take care of some deformities and cracks during installing connectors, transportation, and installments.


FAQs for Precast Sandwich Panel.

What Should be the minimum thickness of the Precast Sandwich Panel?

The base acceptable thickness of the Precast Sandwich Panel can be directed by the board dealing with it.

For example, regardless of stack requirement, a base bolt width of 19 mm should be used for any precast dealing.

This means that if standard installation measures are used, regardless of whether the underlying model requirements are met, there are minimum thickness requirements.


What are the Different Types of Surface Finishes Used in Precast Sandwich Panel?

The different types of surface finishes used are:

  • Honing/polishing.
  • Surface retarders.
  • Acid etching.
  • Sandblasting

Putting stone, heated, or brick-faced boards in a form and pouring cement over surface finishes to bind them together in a pre-assembled board is also possible.


What can Increase Thermal Conductivity in Precast Sandwich Panel?

Warm couples must be regarded in the same manner as U-values must be considered.

A warm bridge breaks the protective layer that increases the thermal conductivity to expand through that specific segment.

Warm bridges form around the connections connecting the boards in the case of the Precast Sandwich Panel.


What Connectors Used in Precast Sandwich Panel nowadays?

Precast Sandwich Panel used cast-substantial connections in the beginning, but nowadays, polystyrene ties are increasingly common.

All ties link the protective layer, resulting in a heated extension to various degrees based on the scale and composition of the connection.


What Kind of Concrete-Sandwich Bond is Used in Precast Sandwich Panel?

Concrete-Sandwich bond is the solid protective bond in boards produced also relied on parallel shear movement.

Indents in the powerful and protective interface were then used to improve the bond in these boards successfully.

The benefit of a common significant protection bond is widely recognized.


What is the Variability of Test Methods of Precast Sandwich Panel?

There is a lot of attention in the sandwich board writing community on evaluating bespoke yet still inexpensive fiber-based polymer connections.

They coordinate materials like glass, carbon, and basalt in changing computations (pin, plate, tube).

Despite this, the archived test techniques and results show a lot of inconsistency. Even for the same connection type, there is a significant variation in outcomes across different studies.


What is the Thermal Conductivity of Fiber Reinforced Polymer in Precast Sandwich Panel?

Fiber-Reinforced Polymer (FRP) connections were utilized to modify metallic connectors and address a problem for the firm. Nowadays, they are frequently used.

FRP has a lower thermal conductivity (~2 W m−1∙K−1) than steel (~48 W m−1∙K−1), and they will now move less heat while crossing the protective layer as connections.


What Innovations are Used in Precast Sandwich Panel Manufacturing?

The industry has pushed chiefly advancements in the assembly cycle during the previous few years, primarily focusing on speeding up production.

Precast manufacturers frequently use quick-setting concrete in their mixes to achieve excellent quality in 18–22 hours (or less), and heat relieving is occasionally used to aid early-age strength development.


What Modifications are Required to Use Precast Sandwich Panel in Walls?

The complete wall construction may be made out of the sandwich board (inward and outside).

To increase the warm mass benefits, there is no compelling need for a mortar line inside.

To obtain the desired U-Value, we can alter the shape, thickness, and size of the substance as needed and the thickness of the protection.


What is Thermal Conductivity Required for Residential Building?

Surprisingly, most panels require a minimum U-worth of 0.19 W m2 K1 for new homegrown structures and 0.31 W m2 K1 for new non-homegrown facilities.

Only two of the Precast Sandwich Panel recorded meet aloof house guidelines (of 0.18 W m2 K1 or better).

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