Is -98kPa Vacuum Enough? How a Commercial Vacuum Sealer's Pressure Affects Food Shelf Life

When preserving food for weeks or months, the number you see on a vacuum sealer's spec sheet — -98kPa — can mean the difference between fresh steaks and spoiled leftovers. But is this pressure level truly sufficient for commercial and serious home use? This guide helps understand vacuum pressure, its effect on food and its correlation with vacuum sealers like YUMYTH CVS101 with its Dual Mode Chamber System.

What is -98kPa Vacuum Pressure?

Vacuum pressure refers to a negative pressure measurement from standard atmospheric pressure (101kPa). For a vacuum pressure of -98kPa, 98% of the air is extracted, leaving an absolute pressure of 3 kPa.

•-98kPa is a "high vacuum" level, and is far superior to most household vacuum external sealers that typically seal at levels around -60 to -80kPa.

•At -98kPa, vacuum pressure creates a very low residual of 2–3% of air within the chamber. This level of air creates a starving environment for aerobic bacteria and mold.

•It also eliminates the problem of liquid (i.e. soups, marinades, etc) sealing expansion. The vacuum chamber system equalizes pressure inside and outside the bag.

YUMYTH CVS101 Commercial Vacuum Sealer uses a triple-pump system (40L/min for chamber mode). This yields high vacuum pressure with rapid and stable vacuum cycles, even after thousands of usages.

How Vacuum Pressure Affects Food Shelf Life

At -98kPa vacuum pressure, residual oxygen level is very low, significantly slowing food spoilage from oxidation, rancidity, and mold spoilage.

•Oxidation of food is caused by exposure to oxygen and moisture: Vacuum pressure of -98kPa starves aerobic bacteria and mold; oxidation spoilage is also hindered, increasing shelf life by 3-5 times compared to the conventional refrigerator storage method.

•Aerobic bacteria ceases multiplication: Most spoilage bacteria (e.g. Pseudomonas) are aerobic and grow in the presence of oxygen. At -98 kPa, vacuum seals halt bacterial growth and keep the seafood and meat fresh for 2-4 weeks as opposed to the normal 3-7 days.

•Mold and yeast growth are halted: Even in refrigerated conditions, mold will grow on cheese and bread in the presence of air. A Commercial Vacuum Sealer designed to work at -98 kPa will draw out the air and decrease the chances of mold by more than 90%.

Real life shelf life improvement using -98 kPa vacuum (4 °C)

•Raw Beef: 7 days to 21-30 days

•Soft Cheese: 2 weeks to 6-8 weeks

•Cooked Liquid Stews: 3-4 days to 2 weeks (if chamber vacuum sealed)

•Coffee Beans: 2 weeks of loss of aroma to 6 months of beans still retaining aroma

Does Every Food Need -98 kPa? Dual Vacuum Modes

No, not every food needs the maximum vacuum level, which is why the YUMYTH CVS101 has two separate modes designed for this purpose.

•Chamber Mode (-98 kPa, 40L/min): Best for sealing liquids, high moisture content foods (marinated meat, soups, sauces) along with bulk storage for long term. The chamber design of this unit along with a triple-pump system quickly and efficiently reaches the target pressure without the risk of liquid being sucked into the pumps.

•External mode (-80kPa, 8L/min): Best for dry foods such as nuts, crackers, or coffee beans along with quick daily vacuum sealing. This has a faster set up time, however does not seal liquids.

�� Key Point: -98 kPa is not an advanced vacuum setting, but is necessary for high moisture and liquid containing foods. -80 kPa is sufficient for dry goods, however having both modes in one Commercial Vacuum Sealer will provide flexibility without having to buy two separate machines.

Chamber Vacuum Technology and its -98kPa for Liquids

Typical external vacuum sealers encounter problems with liquids. As the external pressure rapidly drops, liquids begin to boil at room temperature (this is called "bubble-over"), damaging the vacuum seal. This issue is addressed with a chamber vacuum sealer.

•As the bag is being vacuumed, the entire chamber vacuum is performed: with the internal pressure in the chamber equal to the external pressure

•There is a dual sealing bars system (3mm x 2): This measurement makes a seal more robust since moisture is 2 redundant barriers.

•The system also counts down the sealing time: The CVS101 has a display, letting users see the time remaining to avoid a pre-emptive seal.

For commercial kitchens or home cooks preserving large batches of soup, chili, or marinated proteins, -98kPa chamber vacuum is not just "enough" — it is the only reliable method.

Additional Features That Make -98kPa Practical and Safe

Achieving high vacuum is one thing; doing it repeatedly without overheating or maintenance issues is another. The YUMYTH CVS101 integrates several design advantages:

•Triple-pump system (40L/min): Reaches -98kPa faster, reducing total cycle time and energy use.

•NTC Thermal Fuse and Overheating Protection: Protects the pump from being damaged if it operates continuously (designed for 3,000 cycles, tested for 10,000).

•Body made from SUS430 Stainless Steel and ABS: Corrosion resistant from liquid spillage maintaining a long-term vacuum integrity.

•Detachable drip tray: Helps protect the pump and keeps the chamber clean when overflows happen.

Built-in cutter and pulse function: Allows custom vacuum levels for delicate items (e.g., bread or berries) while still reaching -98kPa when needed.

When -98kPa Might Be "Too Much" — and Why It's Still Fine

For extremely fragile items like fresh raspberries or meringues, full -98kPa can crush them. However, the CVS101 addresses this with:

•Pulse function (manual control): The user applies vacuum in short bursts, stopping at the desired appearance.

•Accessory mode: For vacuum-sealing jars or containers, pressure can be adjusted via the "Accessory" button, avoiding over-vacuuming.

Thus, -98kPa is the ceiling, not the mandatory setting for every use. The machine gives you control to dial down when necessary.

Conclusion: -98kPa is More Than Enough — It's the Gold Standard

A Commercial Vacuum Sealer that delivers genuine chamber vacuum at -98kPa, like the YUMYTH CVS101, provides:

•Up to 5x longer shelf life for moist and liquid foods compared to standard refrigeration.

•Reliable liquid sealing without boil-over, thanks to chamber technology.

•Dual-mode flexibility (-98kPa chamber / -80kPa external) built for heavy-duty and everyday use.

•Triple pumps, thermal protection, and easy-clean design for safety and durability.

Whether you run a small restaurant, a meal-prep kitchen, or wish to diminish food waste at home, -98kPa is not "just enough" — it is the most scientifically supported professional vacuum preservation standard. Staying in the field requires vacuum sealers that reach and maintain this pressure.

Is it time to invest in better food storage? The YUMYTH CVS101 packs a lot of value by combining -98kPa chamber vacuum with external sealing, a built-in cutter, and marinate function in one compact, easy-to-clean design.

Get the freshness you pay for.

FAQs

Q1: Will the solution in the bag stay in the bag, or will it get sucked into the pump?

A: With this design, liquids in the bag are prevented from boiling and being pulled into the pump. Chamber vacuums equalize bag pressure and outside pressure acting on the bag.

Q2: Is -98kPa too extreme for sealing soft foods like bread, or berries?

A: You can vacuum in a more controlled way by using the pulse function.

Q3: What is the difference between chamber mode (-98kPa) and external mode (-80kPa)?

A: Chamber mode is for sealing moist foods, and for long-term vacuum sealing.

Q4: Can I vacuum seal marinated meats with sauce in it?

A: Yes. Chamber mode, with -98kPa, will provide a clean, no leak seal, thanks to the removable drip tray and the double sealing bars.

Q5: How often do I need to clean the chamber sealer?

A: The chamber sealer will need cleaning after every session that seals liquids. Thanks to the removable drip tray and the smooth SUS430 surface, cleaning the sealer is very quick and easy.