How to Clean Dropper Bottles Yourself A Simple 4-Step Guide

Cleaning cosmetic glass dropper bottles properly is key to keeping your serums, essential oils, and liquids free from contamination. Follow this quick 4-step process to ensure they’re spotless and safe for reuse.
First, disassemble the glass dropper bottle—separate the rubber bulb, glass pipette, and bottle itself. Fill a bowl with warm (not hot) water and let all parts soak for 10–15 minutes. This loosens residue, oils, or dried liquids clinging to the surfaces, making them easier to clean.
Next, disinfect with rubbing alcohol (70% isopropyl works best). Either submerge all components in alcohol for 5 minutes, or pour alcohol into the bottle and squeeze the bulb repeatedly to flush the tube thoroughly. Alcohol effectively kills bacteria and breaks down tough, stubborn grime that plain water would likely leave behind.
After alcohol treatment, rinse all components with warm water to remove any alcohol residue. Then, air-dry them completely on a clean towel—laying them upside down helps speed up drying and prevents moisture buildup, which can lead to mold.
For an extra layer of sanitization, use an infrared ozone sterilizer. Place the dry parts inside, run the machine according to its instructions (usually 10–20 minutes), and let it complete the cycle. Ozone and infrared light work together to eliminate even the tiniest pathogens, ensuring your dropper bottles are germ-free and ready for their next use.
This straightforward routine keeps your dropper bottles in top shape, protecting your products and extending the life of your containers.
pink cap glass dropper bottle

The All-Scenario Revolution of Period Panties Comfort, Leakproof, and Sustainability Leading Women’s Underwear Trends

 

Over the past years, menstrual underwear—also known as period panties—has evolved from a niche eco-friendly alternative to one of the fastest-growing segments in the global women’s lingerie market. In 2024, the global market value neared USD 680 million, with projections to surpass USD 1.5 billion by 2030, achieving a compound annual growth rate of 13% to 15%. Behind these numbers lies a growing awareness of women’s health, the rise of sustainable consumption, and continuous innovation in design and technology. Periods are no longer times to endure discomfort but moments that demand comfort, confidence, and self-care.

High absorption menstrual panties wholesale

 

As the global Period Underwear OEM Suppliers and Wholesale market experiences rapid growth, more brands and distributors are recognizing the potential of this emerging segment. This has sparked a surge in demand not only from end consumers but also from businesses looking to capitalize on new market opportunities.

This shift first manifests in the most direct consumer needs: leak protection and comfort. Early menstrual underwear was viewed mainly as a supplement to disposable products, but increasingly women use it as their primary protection. Advances in leakproof technology are key: premium period panties feature organic cotton or bamboo fiber inner layers for fast absorption, super-absorbent cores locking in moisture, and waterproof, breathable outer layers. High-waist styles with extended back panels offer comprehensive security for overnight and heavy flow users. These functional innovations meet core period needs and lay the foundation for further product development.

OEM leakproof period underwear factory

 

Once leakproof concerns are addressed, comfort becomes the critical factor driving repeat purchases. Modern women continue to work long hours, exercise, and travel even during their periods, fueling demand for seamless period panties and high-stretch fabrics. These designs maintain a stable fit without rolling, shifting, or causing heat buildup. Brands are segmenting their offerings by scenario: commuter styles prioritize stability and invisibility, athletic styles emphasize elasticity and support, and nighttime versions focus on softness and high absorbency.

 

Beyond function, sustainability is reshaping the market. Reusable menstrual underwear significantly reduces waste compared to disposables, appealing to eco-conscious consumers. Certifications such as GOTS organic cotton and GRS recycled fibers have become core brand selling points and contribute to premium pricing. Sustainability is no longer a “nice-to-have” but a decisive factor influencing purchase decisions.

 

Expanding Multi-Scenario Applications Unlock Massive Market Potential

As consumers demand higher health and lifestyle standards, the use cases for period panties have expanded well beyond traditional menstrual protection. This category is rapidly evolving into a multi-functional, multi-purpose product, unlocking enormous market potential.

 

First is the postpartum recovery period. New mothers face extended discharge and intimate care needs. Traditional pads often cause discomfort and require frequent changes. Soft, highly absorbent menstrual underwear is an ideal solution, offering effective protection while minimizing skin irritation and improving comfort.

 

Next is light urinary leakage protection. With age or after childbirth, pelvic floor weakening leads to common minor leakage issues. Specialized leakproof underwear with high absorption and antibacterial fabrics helps women confidently manage daily challenges, significantly broadening the user base.

 

Third, the sports and fitness scenario. Many women worry about leaks during running, yoga, or gym workouts. High-stretch, seamless, quick-dry period panties have become the go-to choice for active women, combining leak protection with freedom of movement and comfort during intense exercise.

 

Additionally, travel and outdoor activities form another important application field. Disposable products are inconvenient to carry and dispose of, while quick-dry, easy-to-clean period panties provide an eco-friendly and practical alternative, meeting the needs of long trips and outdoor enthusiasts.

 

Bulk seamless period panties supplier

 

This cross-scenario functionality not only increases usage frequency but also shifts consumer perception of period panties from “menstrual protection” to “all-year-round functional underwear.” Brands are responding by developing richer product lines, expanding market space and growth opportunities.

 

The competitive landscape is currently divided into three main players. International leaders like Thinx and Modibodi have established global presence through premium design and sustainability narratives; regional brands such as NEIWAI and Bananain quickly capture younger markets by blending local aesthetics with functional innovation; meanwhile, numerous OEM & ODM Period Panties Manufacturers play a crucial role in the global supply chain, providing affordable entry points for emerging brands. Differentiated functional designs, unique aesthetic positioning, and sustainability credentials are key strategies for new entrants.

 

Looking ahead 5 to 10 years, menstrual underwear technology will trend toward thinner, faster-drying, and higher-efficiency absorption. Nano-fiber technologies are expected to significantly enhance comfort and dryness. The demographic will expand from the core 18–35 female group to include teenagers and older women. Cross-category integration will become more common, merging period panties with sports bras, swimwear, and protective underwear to create multifunctional garments. On the distribution side, Direct-to-Consumer (DTC) brands will leverage social media platforms like TikTok and Instagram to accelerate global expansion. For brands and wholesalers alike, 2025 to 2030 represents a golden window of opportunity to capture market share and innovate in this rapidly evolving industry.

 

High absorption menstrual panties wholesale

 

As the period panties market rapidly expands and diversifies across multiple use cases, having a product that meets market demands with unique features has become essential for brands and wholesalers to capture future growth opportunities. We understand the critical role of customization in catering to diverse consumer needs. Whether you aim to develop high-performance period panties for specific scenarios or seek to combine differentiated design with sustainable materials, we offer professional OEM/ODM services and flexible production solutions.

 

Contact us today to create innovative period panties that lead the market and seize your competitive advantage!

Email: Lexie@Sharicca.com

 

Price of Tinplate is Going High

Yarlung Tsangpo River hydropower project as a major national infrastructure projects, if the full start, may indeed have a phased impact on the steel industry.

The main material of empty aerosol tin can is tinplate, now the price of tinplate will be increased, we have to adjust the price of our cans.
Please let us know if you have any plan, we can prepare the material in advance.


Guangdong Sihai Iron-Printing & Tin-Making Co., Ltd. was founded in 1998, located in the beautiful tourist city of Zengcheng, Guangzhou. Our company covers an area of 38,000 square meters and our main business is tinplate trading, coil cutting, coating, printing and tin-making.


What physical tests does the tube packaging have to undergo?

1.Thickness measurement

The precise thickness of each layer of a tube is fundamental to its performance. This test uses a micrometer or specialized thickness gauge to measure the actual thickness of each layer (from the inner barrier film to the outer printed layer), typically at five to ten points throughout the tube. The goal is to ensure compliance with design specifications.

2.Sealing performance test

Heat Seal Strength (Tube End): Tube ends are sealed using heat during the manufacturing process. This test measures the force required to tear the seal. It ensures that the seal will not crack during extrusion, transportation, and storage. Standards generally require a minimum strength to ensure reliability.

Torque Test (Tube End to Cap): This test evaluates the tightness of the connection between the tube end and the cap. A torque meter measures the force required to unscrew or tighten the cap, ensuring it is neither too loose nor too tight. Typical ranges vary depending on product type—cosmetic tubes may require 0.5-1.5 Nm.Positive/Negative Pressure Test: To simulate extreme conditions, the tube is subjected to positive or negative pressure in the seal. This can identify micro-leakages in the seal that may be missed by standard visual inspection.

3.Barrier performance test

Barrier performance is crucial for products susceptible to external influences like oxygen and light. 

Two key test types dominate this category:

Oxygen Transmission Rate (OTR): According to the standard, this test measures the amount of oxygen that passes through the tubing material over time. A low OTR is crucial for products like vitamin C serums or essential oils, as oxidation can reduce their effectiveness.

Water Vapor Transmission Rate (WVTR): According to the standard, this test quantifies the amount of moisture that migrates through the tubing. This is crucial for dry products (such as powdered skincare) or water-sensitive formulas, as excessive moisture can lead to clumping or microbial growth.

4.Mechanical strength testing

Compression resistance: This test simulates warehouse stacking, placing the hose under pressure for a week. This checks for deformation, collapse, or seal failure under sustained load.

Drop test: Tubes (empty and full) are dropped from various heights (e.g., 1 meter, 1.5 meters) and at various angles (vertical, horizontal, diagonal) to simulate an accidental drop. This test ensures there are no cracks, leaks, or cap detachments.

Flex resistance: The tube is repeatedly flexed, particularly at the shoulder (where the barrel meets the nozzle), until it breaks, typically over 10,000 cycles. This test assesses the durability of travel-sized hoses or products designed for portable use.

5.Extrusion performance testing

You know what? A user's experience with a product is largely tied to how easy it is to squeeze the stuff out and how clean the whole process is.Take those squeeze tests, for example. We use something called a texture analyzer to measure just how much force is needed to get the product out of the tube. The goal here is to make sure it's not a total nightmare to squeeze (because who wants to get all frustrated, right?). But at the same time, it shouldn't be so easy that you end up squirting out way more than you need.And it doesn't stop there. The testers also keep an eye out for issues like "rat tails." You know, those stringy bits that hang around after you've squeezed the tube? Or problems with uneven flow. These little things might seem minor, but they can lead to a whole lot of wasted product and just a generally crummy experience for the user.Now, when it comes to medicine tubes where you need to get the exact right dose every single time, things get even more serious. The consistency of how much comes out with each squeeze is checked super carefully. 

empty cosmetic tube packaging

Eco Friendly Custom Cases - Sustainable Solutions for Packaging

As environmental concerns continue to grow for today industries, more businesses are seeking sustainable packaging solutions that reduce their carbon footprint without compromising on quality or protection.  At Yisi Packing, we are proud to offer eco friendly custom cases that combine durability, functionality, and environmental responsibility.

 

Why Choose Eco Friendly Custom Cases?


Traditional packaging materials often contribute to landfill waste and pollution, but eco friendly custom cases are designed to minimize environmental impact.  These cases use recyclable, biodegradable, or sustainably sourced materials, ensuring that your packaging is as green as possible.

 

Materials That Make a Difference


At Yisi Packing, we use a variety of sustainable materials in our custom case manufacturing.  This includes recycled plastics, biodegradable foam inserts, and responsibly sourced wood or cardboard components.  These materials maintain the same high standards of protection and durability that you expect, while significantly reducing waste.

 

Design for Reuse and Longevity


Eco friendly packaging isn’t just about materials, it’s also about design.  Our custom cases are built to last, encouraging reuse and reducing the need for frequent replacements.  By creating cases that can withstand multiple uses and tough conditions, we help clients lower their packaging waste over time.

 

Meeting Industry Standards


Sustainability doesn’t mean reducing performance.  Our eco friendly custom cases meet rigorous industry standards for protection, whether you’re shipping sensitive electronics, medical equipment, or industrial tools.  With Yisi Packing, you get peace of mind that your products are safe and your environmental goals are met.

 

How Your Business Benefits


Switching to sustainable packaging can enhance your brand image, appeal to eco conscious customers, and sometimes even reduce costs in the long run.  Many industries are moving toward greener practices, and choosing eco friendly custom cases positions your business as a leader in environmental responsibility.

 

 

Partner with Yisi Packing for Sustainable Packaging 


If you’re ready to make the switch to eco friendly custom cases, Yisi Packing is here to help.  We’ll work with you to design packaging solutions that protect your products and the planet.  Contact us today to learn more about our sustainable options and how custom cases can fit into your green idea.

EVA Case Customization 101 Design & Build Basics

Recently, one of our customers mentioned that it would be helpful for buyers if we could create a blog about Step by Step EVA Case Customization.  While this may seem like a basic topic for us, having produced various cases for decades, it can be very informative for buyers who may not have much experience in this area.

 

Please read the following information, which we hope will help you develop cases that meet your specific needs and are truly fit for purpose.

 

Outer Shell Material

 

Polyester and PU are commonly used as outer materials for EVA cases.  This is because the outer covering must have enough elasticity to stretch.  If not, the material may wrinkle or become defective in certain areas.

 

As a professional case manufacturer, we provide guidance if our buyers choose their own outer shell material.  It's important that the selected material fits the intended purpose.

 

One example: A customer wanted to use PU for a protective case for measuring tools.  While PU gives a premium, leather like feel, we advised against it.  His case was meant for use in extreme construction environments, where durability was critical.  We suggested 1680D Polyester instead, which is more robust and suitable for such conditions.  He agreed, made a sample, and sent it for durability testing.  As expected, it passed.  He was very pleased with the outcome, otherwise, there could have been complaints from end users if the wrong material had been chosen.

 

Lining Options

 

The lining material depends on the type of device inside the case.  For example, velvet lining is suitable for optical or watch cases, as its soft, suede like texture helps prevent scratches.

 

In contrast, devices like medical equipment often require smooth, waterproof linings.  These cases must be easy to clean, especially if the inside gets dirty.  A suitable lining allows quick and simple maintenance.

 

Unfortunately, many manufacturers in China use tricot as a standard lining without much consideration.  They focus only on cost and production convenience, overlooking the practical use and potential side effects of using the wrong material.

 

Insert Options

 

Most of the time, we use die cut EVA inlays as a cost effective solution to hold your equipment securely.  However, if the shapes or styles of the items are too complex or not suitable for standard die cutting, we may recommend using an EVA molded tray or CNC foam insert instead.  Our solution will be based on the specific details and requirements you provide for your project.

 

Inside Pocket Options

 

Besides the main device, extra pockets are often needed for accessories.  Many buyers aren’t sure what kind of inner pockets are suitable.

 

As an experienced EVA case solution provider in China, we usually recommend mesh pockets with elastic bands if the accessories should be easily accessible and visibility isn’t a concern.  For accessories that need to stay secure or hidden, such as jewelry, we suggest polyester inner pockets with zippers to keep everything safe and in place.

 

Logo Options

 

For a simple, durable, and cost effective solution, debossed or embossed logos directly on the case are ideal.  However, if the logo has fine details or complex design elements, alternatives like woven labels, rubber patches, metal plates, or TPU embossed logos may be better.

 

We’ll recommend the best option to showcase your brand.  A well designed case isn’t just protective, it becomes a moving marketing tool throughout the product’s lifecycle.

 

Zipper Options

 

For office or kids’ products, we recommend regular nylon zippers for smooth and easy use.  For specific industries or functions, waterproof nylon zippers are necessary.

 

For instance, a customer developing a first aid kit case needed durability in extreme conditions.  We insisted on high quality, waterproof YKK zippers.  For life saving equipment, it's crucial that everything inside functions properly and stays protected.  As a responsible manufacturer, it’s our job to make sure your product performs reliably when it matters most.

 

Handle Options

 

Handle choices depend on the case's size and weight.  For large, heavy cases, we recommend webbing handles with plastic grip parts for comfort and durability.  For smaller, simpler cases, a basic webbing handle can help reduce costs.

 

We always use suitable components to match the purpose, ensuring our proposals stand out from other manufacturers in the market.

 

Accessories Options

 

Whether you prefer metal or plastic accessories, all components we use pass luggage grade loading and aging tests.  Whichever case you develop with us, you won’t need to worry about broken parts or user complaints, something we hear often from buyers working with low cost suppliers.

 

Many factories reduce costs by using cheap, stock accessories. Naturally, this affects the final product quality.  With us, you can be confident in what you’re getting.

 

Finally, we are happy to support your case development, no matter your industry.  Our goal is to provide reliable, long lasting products that keep your valuable items safe.

 

Feel free to contact us today info@packingyisi.com for more information.

 

 

 

Should Vitamin C Serums Be Stored in Dark Glass Bottles? Why Not Plastic?

The Delicate Nature of Vitamin C

Vitamin C, also known as ascorbic acid, is a powerhouse ingredient in skincare, renowned for its antioxidant properties, ability to brighten the complexion, and stimulate collagen production.However, it's also a highly unstable compound. It's extremely sensitive to light, air, and heat.Once exposed to this substance, vitamin C will be quickly destroyed, lose its efficacy and become useless. Such decline not only prevents you from enjoying all the benefits brought by the essence, but may also cause side effects and skin discomfort.

 

The Advantages of Dark Glass Bottles

Dark glass bottle (usually amber or brown in colour) act as a shield for Vitamin C serum. The dark glass bottle acts as a natural filter, blocking most ultraviolet (UV) and visible light. This helps to slow down the oxidation process that occurs when vitamin C is exposed to light, thus maintaining the stability and potency of the serum longer. In addition, glass is an impermeable material, which means it is difficult for air to pass through. This better prevents Vitamin C from being oxidised by atmospheric oxygen, which ensures that each product remains undamaged until your end use.

 

The Drawbacks of Plastic Bottles

In contrast, plastic has several disadvantages when it comes to storing vitamin C serum. Firstly, plastic is usually more transparent to light than dark coloured glass. Even though this plastic bottle is tinted, it still allows more light to pass through, which can speed up the breakdown of vitamin c. Secondly, plastic is a porous material. Over time, air can slowly seep into the bottle through the small holes in the plastic, causing the serum to oxidise. Additionally, some types of plastic may contain chemicals that can leach into the product, potentially causing skin reactions or altering the ingredients of the formula.

glass bottle for skin serum

 

Advantages of Empty Aerosol Can from Guangdong Sihai

empty aerosol tin can factory

Guangdong Sihai Iron-Printing & Tin-Making Co., Ltd. is a factory specializes in aerosol industry over 27 years. Our factory mainly manufacture empty aerosol tin can, top& bottom and provide iron-cutting and iron-printing service. Also we can help to supply aerosol valve & button and plastic cap.


The belows are the advatnages of our empty aerosol can:

1. good sealing: aerosol tin can is made of high-quality tinplate, a good sealing properties material, which can effectively prevent aerosol contents from leaking, ensuring product quality and safety.

2. Strong pressure resistance: aerosol tin spray can withstands a certain pressure, which is suitable for packaging aerosol products with high pressure, popu;larly used in perfume, insecticide, air freshener spray and so on.
3. Sturdy and durable material: with its high strength and hardness, tinplate can resist external collision and extrusion to protect the aerosol contents from damage.
4. Good printing effect: the colorful patterns and words can be printed on the surface of aerosol tin cans ,  which shows the aesthetics and attractiveness of the products.
5. Environmentally friendly and recyclable: due to its recyclability, the discarded aerosol tin cans can be recycled and reused to reduce pollution to the environment.
6. Lower cost: compared with other materials for aerosol packaging, aerosol tin can is less costly and have higher cost performance.

EVA Case Buyer’s FAQ Everything You Need to Know Before Ordering

If you're considering ordering custom EVA (Ethylene Vinyl Acetate) cases for your products, you're likely to have some questions.  At Yisi Packing, we specialize in custom EVA case solutions for a wide range of industries.  To help you feel confident and informed, we've compiled answers to the most frequently asked questions from our customers.

 

✅ 1. What Is a Custom EVA Case?

 

A custom EVA case is a lightweight, semi rigid case designed for protection, portability, and branding.  EVA material is shockproof, waterproof, and highly customizable, making it ideal for electronics, tools, medical devices, cosmetics, and more.

 

✅ 2. What’s the Minimum Order Quantity (MOQ)?

 

Our typical MOQ is 500 pieces per design.  However, for initial testing or sample orders, we may offer flexibility depending on your needs.  Feel free to contact us to discuss your project in detail.

 

✅ 3. Can You Customize the Size, Color, and Logo?

 

Absolutely!  As a leading OEM/ODM EVA case manufacturer in China, we offer full customization:

 

  • Size and shape based on your product

  • Color options for case material and zipper

  • Custom logo printing, embossing, or rubber badges

 

✅ 4. What Is the Production Lead Time?

 

Production usually takes 25–35 days, depending on the complexity and order quantity.  We also offer sample development within 7- 10 days so you can approve the design before full production begins.

 

✅ 5. How Do You Ensure Quality?

 

We have a strict quality control system, from raw material selection to final inspection.  All products are checked for durability, functionality, and appearance before shipping. Quality is at the core of everything we do.

 

✅ 6. Do You Ship Worldwide?

 

Yes! We have experience exporting custom EVA cases to over 30 countries.  We can ship by sea, air, or express courier, depending on your timeline and budget.

 

✅ Ready to Get Started?

 

If you’re looking for a reliable EVA case manufacturer in China, Yisi Packing is here to help.  Contact us today for a free consultation or quotation, and let’s create the perfect case for your brand.

 

📧 Email: info@packingyisi.com
🌐 Website: www.packingyisi.com

 

 

Why do skin care products tend to change color in glass bottles?

Contents change color or evaporate? Is the barrier property of the glass bottle not good enough?

Many customers have reported problems such as discoloration, abnormal odor, and decreased concentration of skin care products during product sales or use. This is especially true for skin care formulas containing essential oils, active ingredients, or natural plant extracts. In other words, during product sales or daily use, consumers often report that skin care products have changed color; some products emit abnormal odors, which not only affects the user experience, but may also have an adverse effect on skin health; and some customers have found that the concentration has decreased after use, which undoubtedly reduces the effectiveness of the product.

 

Cause analysis

These problems are often closely related to the poor light-blocking ability and airtightness of glass bottles. Although transparent glass has a good visual effect, it is easy for external factors such as ultraviolet rays, oxygen, and water vapor to affect the stability of the contents when exposed to strong light, temperature fluctuations, or repeated opening and closing. In addition, if the bottle mouth sealing structure is not designed properly, it will also accelerate the contact between the contents and the air, causing the components to degrade or volatilize.

 

Solution

1. Choose dark glass bottles: Using brown, green or black glass bottles can significantly reduce UV penetration and effectively delay the oxidation and deterioration of products.

2. Spray the inner film on the bottle: By spraying a chemically stable coating on the inner wall, the glass can enhance its ability to isolate the contents, prevent the components from being adsorbed on the bottle wall or reacting with the glass in trace amounts, thereby extending the shelf life of the product.

3. Use vacuum pump bottles or airtight dropper bottles: The vacuum structure design can reduce air residue during filling and prevent external air from flowing back during use, which is particularly suitable for packaging highly active skin care products such as essence skin care products.

4. Optimize the bottle mouth sealing structure design: Add a variety of sealing structures such as sealing gaskets, precision screw caps and closed sleeves to improve the overall air tightness, effectively block the entry of air and water vapor, and avoid the volatilization and contamination of internal substances.

amber essential oil glass bottle