Morning stomach ache: 10 main causes and remedies
Abdominal pain after waking up affects your health and quality of life. So, why do you often experience abdominal pain after waking up in the morning, and what can you do to improve it?
03/05/2025
Should you buy a spring mattress or a latex mattress? Detailed comparison of the two types
If you are among the many people who are about to buy a mattress and are confused about whether to choose a spring mattress or a young latex mattress, then this article is for you. Below Ru9 will compare details for you to decide which mattress is right for your body and personal preferences.
01/05/2025
What is PVC Foam? Advantages and disadvantages of PVC Foam sheets
PVC Foam sheets are a popular material in construction, interior design, and advertising due to their lightweight, durable, and easy-to-process characteristics. Let's learn about what PVC Foam is, its common types, and a detailed price list in this article.
1. What are PVC Foam sheets?
PVC Foam (also known as foam board) is a material produced from PVC plastic, foaming agents, and special additives. Therefore, this product has fire resistance, heat insulation, waterproofing, oxidation resistance, and can withstand harsh environments.
Thanks to its high durability, PVC foam sheets are widely used in both interior and exterior design.
2. Advantages of foam sheets
High durability
Compared to 3D PVC wall panels, Foam sheets have high durability, are not oxidized or chemically corroded, and come with a warranty of up to 50 years.
In particular, Foam sheets, especially white Formex sheets, have good load-bearing capacity and are therefore applied in many fields.
Easy to transport and install
Unlike industrial wood, this material is lightweight, similar to plastic or mica, making it easier to install on walls and ceilings.
PVC Foam sheets reduce pressure on the installation surface, while ensuring safety and durability for the construction.
Good waterproofing, heat and electrical insulation
Thanks to their effective moisture and water resistance, PVC Foam plastic boards are commonly used for bathroom cladding or in areas with high humidity.
With superior heat and electrical insulation properties, this material helps save electricity and maintain a stable temperature in living spaces. At the same time, it also ensures safety for users.
High aesthetic appeal
PVC Foam sheets are manufactured using advanced technology, offering a variety of designs and styles, enhancing the aesthetics of construction projects and interior spaces.
Additionally, you can easily paint Foam sheets with your favorite colors. The installation, cladding, and bonding of Foam sheets are also very simple thanks to specialized adhesives.
3. Applications of PVC Foam sheets
PVC Foam can be used for various purposes such as:
Making advertising signs, printing letters
The advertising industry favors PVC Foam sheets because of their light weight and ease of installation, allowing for the creation of advertising signs of various sizes and designs.
Making partitions
Wood-grain PVC sheets are popular decorative materials that both enhance aesthetics and effectively divide space.
In addition, wood-grain PVC wall panels also have good heat and electrical insulation properties, contributing to a cool and safe living space.
Making kitchen cabinet and refrigerator panels
PVC Foam sheets, with their excellent moisture and water resistance, are particularly suitable for high-humidity environments like kitchens.
Foam sheets are often used to clad kitchen cabinets, refrigerators, and other areas in the kitchen space.
Cladding ceilings in homes, trains, cars
PVC Foam sheets are an ideal choice for cladding ceilings in homes, cars, or trains thanks to their superior water resistance and extreme durability, ensuring safety for both people and vehicles during use.
Other applications
Thanks to their many outstanding advantages, PVC Foam sheets are widely used in many different fields such as wall cladding in bathrooms, saunas, and living rooms for waterproofing.
Or you might see PVC Foam used for sports equipment, bathroom floors, swimming pools, ships, etc., due to its water resistance and high durability.
4. Latest price list for PVC Foam plastic boards 2025
Below is a price list for PVC Foam plastic sheets based on thickness compiled by Ru9 for your reference. Please note that prices may vary depending on the distributor and time of purchase. For exact prices, you should contact the supplier directly.
Price list for PVC Foam plastic sheets 0.55g/cm3
Below are the per-sheet prices for PVC Foam boards with a density of 0.55g/cm3.
Thickness (mm)
Size (mm)
Reference price (VND/sheet)
5mm
1220 x 2440
250,000 – 280,000
8mm
1220 x 2440
380,000 – 410,000
10mm
1220 x 2440
480,000 – 510,000
12mm
1220 x 2440
580,000 – 620,000
15mm
1220 x 2440
700,000 – 740,000
17mm
1220 x 2440
780,000 – 820,000
20mm
1220 x 2440
910,000 – 950,000
Price list for PVC Foam plastic sheets 0.6g/cm3
Below are the per-sheet prices for PVC Foam boards with a density of 0.6g/cm3.
Thickness (mm)
Size (mm)
Reference price (VND/sheet)
5mm
1220 x 2440
270,000 – 290,000
8mm
1220 x 2440
420,000 – 450,000
10mm
1220 x 2440
520,000 – 550,000
12mm
1220 x 2440
630,000 – 670,000
15mm
1220 x 2440
790,000 – 830,000
17mm
1220 x 2440
900,000 – 940,000
20mm
1220 x 2440
930,000 – 970,000
PVC Foam sheets are a versatile material solution with many outstanding advantages, suitable for both interior and exterior spaces. Through the information and price list shared, we hope you better understand what PVC Foam is and can choose the right product for your needs and projects.
See more: What is PE Foam? Characteristics and applications of this material
Discover affordable Foam mattresses and mattress toppers at Ru9
29/04/2025
What is PE Foam? Applications of PE Foam
PE Foam is a familiar material in daily life thanks to its lightweight, durable, flexible properties, and effective thermal insulation and shock absorption capabilities. So, what is PE Foam? The article below will provide an overview of the characteristics and common applications of this foam.
1. What is PE foam?
PE Foam (Polyethylene Foam) is a type of material made from polyethylene with a porous structure, making it lightweight and highly elastic.
PE Foam is produced by blowing gas into molten polyethylene to create many air bubbles, which are then solidified into sheets or blocks.
Depending on the intended use, PE Foam sheets are manufactured with different densities and thicknesses but are mainly used in packaging and shipping.
PE Foam can be reused and recycled without harming the environment. Therefore, PE Foam is widely applied in many industries as well as in agriculture and forestry.
See more: What is PVC Foam? Characteristics and applications of the material
2. Characteristics of Polyethylene Foam
So what are the outstanding characteristics of PE Foam? This foam sheet material has several excellent advantages such as:
Lightweight and flexible: PE Foam is lightweight, convenient for transportation and installation. Thanks to its high elasticity, this material can be bent and still retain its shape without damage.
Thermal and sound insulation: PE Foam helps reduce heat transfer, maintaining a stable temperature thanks to its good thermal insulation. At the same time, this material also has effective sound insulation properties, reducing noise in construction and industrial applications.
Shock absorption and protection: With its impact absorption capability, PE Foam effectively protects fragile products during transit. It also helps reduce vibration, protecting sensitive equipment.
Moisture and chemical resistance: PE Foam is waterproof and moisture-resistant, making it ideal for applications in humid conditions. Additionally, this material is chemical-resistant, enhancing its durability in harsh environments.
3. Types of PE Foam
Based on size, shape, thickness, and color, PE Foam can be customized to suit specific purposes. Let Ru9 explore the two most common classification methods for PE Foam sheets today!
Classification of PE foam sheets by shape
Sheet PE Foam: Widely used in packaging, construction, and furniture manufacturing, providing high protective effectiveness.
Roll PE Foam: Suitable for applications requiring soft, flexible, and easily bendable material.
Block PE Foam: Used to protect products with complex structures, minimizing the risk of damage during transportation.
Granular PE Foam: This is an ideal choice for shaping products with special forms through the molding process.
Classification of PE foam by thickness
Thin PE Foam 0.5 - 1mm: The thinnest type of PE Foam is soft, lightweight, and smooth, ideal for protecting light products. Due to its ease of handling and space-saving properties, this foam is often used in packaging for TVs, computers, electronic devices, wooden products, and handicrafts.
Thin PE Foam 2 - 3mm: With a thickness of only 2 – 3 mm, PE Foam offers softness and good impact resistance. It is widely used for flooring, thermal insulation, waterproofing, and mold prevention. Additionally, this type of foam is used as corner protectors to prevent scratches and damage to materials like glass and doors.
Thick PE Foam: PE Foam comes in various thicknesses, such as 5mm, 8mm, 10mm, up to 20mm or 50mm. Thicker types are formed by laminating multiple layers to increase stiffness and durability, suitable for protecting heavy goods or processing into custom-shaped products.
4. Applications of PU Foam
Packaging and shipping: Thanks to its shock-absorbing properties, PE Foam is used to protect fragile products such as electronic devices, glass, and ceramics during transit. It is also used to line and fill gaps in cardboard boxes, preventing goods from shifting.
Construction and thermal insulation: PE Foam is a popular choice in construction projects due to its sound and thermal insulation capabilities. It is used to line floors, walls, and ceilings, contributing to a quiet and temperature-stable living environment.
Automotive and transportation manufacturing: Due to its shock-absorbing and sound-insulating properties, PE Foam is used in vehicles to line seats, compartments, and protect components. It helps increase comfort and reduce noise during travel.
Household goods and furniture: With its lightweight and elastic properties, PE Foam is used to produce chair cushions, PE Foam mattresses, and furniture products. Additionally, it is applied in manufacturing toys and lightweight household items.
Medical and medical equipment: PE Foam is an ideal material for protecting delicate and sensitive medical equipment. It is also used in the production of medical products such as orthopedic splints and anti-decubitus cushions.
See more:
What material are Foam mattresses made from? Advantages and disadvantages of Foam mattresses
Is a Foam mattress topper good? What types of toppers are there?
5. Some notes when using, storing, and recycling PE Foam
Choose the right type of PE Foam: Clearly identifying the density, thickness, and physical properties of PE Foam is crucial for selecting the appropriate type.
Proper storage: To ensure the longevity of PE Foam, it should be stored in a dry, cool environment, away from direct sunlight and high temperatures.
Recycling and disposal: Used PE Foam should be recycled to minimize negative environmental impact.
PE Foam is a lightweight, durable, heat-insulating, and shock-absorbing material, widely used in many industries. This article hopefully helped you better understand the characteristics and applications of PE Foam.
Article referenced from: https://en.wikipedia.org/wiki/Expanded_polyethylene
29/04/2025
Why children sweat on their back and head while sleeping, and how to fix it
Parents always need to pay attention to their child's health conditions to handle them promptly, especially with newborns. An immature immune system is why children are prone to complications. Is it dangerous if a baby sweats on their back while sleeping? What are the causes of back sweating during sleep in infants and young children? Let Ru9 help you find the answers and solutions in this article.
1. Is sweating on the back while sleeping a disease?
Mothers with young children often worry when their babies sweat on their backs and heads while sleeping. So, is it a symptom of a disease? According to science, sweating on the back during sleep in children is a sign of night sweats. What are night sweats in children, and what are their classifications?
Night sweats are a heat dissipation reaction to cool the body when exposed to a higher temperature environment. Night sweats on the head and back are common in infants. Children will sweat a lot on their back, hair, neck, etc., causing them to sleep poorly, cry, and have a weakened immune system. There are two common types of night sweats:
Physiological night sweats: Young children's metabolism is stronger than adults, so they often sweat on their backs while sleeping to regulate their body temperature. Therefore, this type of night sweat is just a natural physiological phenomenon in young children and does not affect their health.
Pathological night sweats: This type of night sweat often appears in children with rickets, poor appetite, large skull bones, etc. The symptom is that even when the weather is not hot, the child sweats a lot, especially when breastfeeding or sleeping.
Night sweats are very common in infants and young children.
2. Why do children sweat a lot on their head and back while sleeping?
Not all of a baby's sleep is peaceful. Many children sweat on their backs while sleeping, making them uncomfortable, causing disturbed sleep, and potentially leading to more severe illnesses. Parents need to find the cause to handle it promptly. Below are some common causes of back sweating during sleep in children.
2.1. Internal causes in the child's body
Children sweating a lot on their head and back while sleeping can be due to:
Children who are malnourished and do not receive essential nutrients (vitamin D, zinc, calcium, etc.): Vitamin D is an important nutrient for bone development; a deficiency can easily lead to night sweats in children. Premature babies, those with rickets, or children with digestive problems are also prone to vitamin D deficiency.
The nervous system is in the process of developing and maturing: The nervous system is responsible for controlling body temperature after receiving signals from the environment. Since a child's nervous system is not yet stable, it cannot regulate body temperature well, which can lead to increased sweating.
Cardiovascular disease: A weak cardiovascular system requires more energy to pump blood throughout the body, thus also causing children to sweat on their backs while sleeping and wake up more often.
Children with sleep apnea: Premature babies are prone to sleep apnea. Symptoms last for about 20 seconds, the skin turns pale, the child has difficulty breathing, and sweats a lot on their head and back.
Children with hyperhidrosis: If the weather is cool but the child still sweats a lot on their back and head while sleeping, it could be hyperhidrosis. Parents should pay attention to frequent hygiene for their child; this symptom usually gradually decreases and resolves itself as the child grows older.
In addition, some other internal causes of back sweating during sleep in children include: Overweight or obese children; Children using medications with side effects; Children with autonomic nervous system disorders; sympathetic nervous system; The normal body temperature of infants is often high; Hormonal changes; Excessive physical activity; Children who are anxious or stressed, etc.
2.2. Sweating on a baby's back while sleeping can be due to medical conditions
Sweating on the back during sleep in children can be a sign of some diseases.
Common cold: In addition to excessive back sweating, children may also experience other symptoms such as nasal congestion, coughing, and sore throat.
Infection: A baby sweating on their back while sleeping can be a sign of an infection.
High blood pressure: High blood pressure in children can also lead to this sweating phenomenon.
Congestive heart failure: Congestive heart failure often leads to poor appetite, fatigue, frequent coughing, and slow weight gain.
Hyperthyroidism: Children with hyperthyroidism not only lose weight, are anxious, and have a rapid heart rate, but also often sweat a lot on their head and back, especially at night.
Diabetes: If the child's sweat smells like acetone (nail polish remover); they urinate a lot, lose weight, etc., then the child may have diabetes.
2.3. Environmental factors causing children to sweat on their backs while sleeping
External environment affects the quality of infant sleep.
External environmental factors also significantly affect a child's sleep.
Room too hot: A bedroom with too high a temperature and poor ventilation makes children feel hot and sweat.
Poorly breathable blankets and mattresses: In addition, uncomfortable blankets and mattresses can also be a reason why children sweat on their head and back while sleeping.
Hot and humid climate: Overly hot and humid environmental temperatures are also one of the reasons why infants sweat on their backs while sleeping.
If you are looking for cool and hypoallergenic blankets and mattresses for children, consider Ru9 products!
Ru9's Original Mattress is designed with three sturdy foam layers and a highly absorbent Tencel cover, creating breathability between the three foam layers to prevent children from feeling stuffy when in contact with the mattress. In addition, the second
Ru9 blankets and mattresses are made from natural materials safe for young children.
The Eucalyptus Blanket from Ru9 has an outer shell made of 100% eucalyptus fiber, keeping the body warm yet breathable. Natural materials are safe for a child's delicate skin and do not cause irritation. With modern technology, the eucalyptus blanket can regulate temperature, reducing the stuffy feeling when covered. The eucalyptus cotton filling provides softness and fluffiness yet is quite light.
You may be interested in: Should you buy a Ru9 memory foam mattress? Is this type of mattress suitable for children?
3. Is it dangerous for infants to sweat on their backs while sleeping?
Based on these causes, we can see that infants sweating on their backs while sleeping is not always a dangerous sign. For causes related to the environment or some physiological reasons within the child's body, parents do not need to worry too much.
A baby sweating on their back while sleeping becomes dangerous when accompanied by some symptoms such as:
Snoring.
Mouth breathing.
Wheezing, rapid breathing.
Deep abdominal retraction with each breath.
Ear pain, stiff neck, the baby becomes picky eater.
Rapid weight loss, severe vomiting, and diarrhea.
See more: Is it dangerous for a baby to have a 39-degree fever but still sleep well?
4. How to handle an infant sweating on their back while sleeping
Parents may need to monitor their child's sleep condition to quickly find solutions.
To overcome sweating that affects a child's sleep quality, parents can take the following steps:
Use cool, soft, and supportive blankets, mattresses, and pillows. Ru9 products are made from friendly, safe materials that cherish sleep, allowing children to maintain a natural sleeping posture without feeling stuffy or sticky after many hours of sleep. The layered structure is tightly linked but still breathable, effectively neutralizing phản lực for a gentle sleep.
Simplify clothing layers, keep the baby cool; remember to choose comfortable, highly absorbent clothing, blankets, and diapers.
Adjust room temperature, ensuring it's cool enough for the child.
Supplement the child with enough vitamin D, let the child sunbathe in the morning for 10-30 minutes.
Limit excessive physical activity before bedtime.
Keep the child's body clean daily and provide adequate water.
Do not let the child be afraid when sleeping, and do not eat too much before bedtime.
Provide the child with a balanced diet including many cool, sweet fruits and vegetables rich in nutrients. Limit hot and greasy foods.
If the child sweats a lot on their head and back, use a soft towel to wipe away the sweat to help prevent the child from catching a cold.
If the child shows any dangerous signs mentioned above, parents should take the baby to see a doctor.
Above, Ru9 has provided readers with the causes of infants sweating on their backs while sleeping. Sleep is very important for children, especially in the first 3 months of life, when a child's sleep accounts for most of the day. Parents should monitor their child to promptly address any issues affecting their health.
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Is it good to sleep naked? Risks and things to note
To get a good night's sleep, many people often have the habit of sleeping naked. Sleep experts have acknowledged that maintaining a cool state of the body helps to sleep better and more deeply.
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