Hot air ovens use extremely high temperatures over several hours to destroy microorganisms and bacterial spores. The ovens use conduction to sterilize items by heating the outside surfaces of the item, which then absorbs the heat and moves it towards the center of the item.
Of all the methods available for sterilization, moist heat in the form of saturated steam under pressure is the most widely used and the most dependable. Steam sterilization is nontoxic, inexpensive 826, rapidly microbicidal, sporicidal, and rapidly heats and penetrates fabrics (Table 6) 827.
Hot air ovens are laboratory testing equipment that are used to sterilise materials such as glassware, chemicals, and sealed containers. They are also used for drying, baking, curing, and heat-treating various substances.
They are ideal to sterilize powdery materials. These ovens contain fans that circulate hot air inside the chamber. The forced air circulation by the oven provides unique temperature uniformity and rapid heat recovery. They are used in labs for cultures or sample procedures.
Hot air ovens use extremely high temperatures over several hours to destroy microorganisms and bacterial spores. The ovens use conduction to sterilize items by heating the outside surfaces of the item, which then absorbs the heat and moves it towards the center of the item.
A hot air oven is a type of dry heat sterilization. Dry heat sterilization is used on equipment that cannot be wet and on material that will not melt, catch fire, or change form when exposed to high temperatures.
Drying with hot air is independent of the texture, the sensitivity and the condition of the respective surface. Simple, fast and contact-free The key advantages of hot-air drying: Much reduced drying times.
An autoclave uses pressure and steam to sterilize the contents. It's quick and uses lower temps than air ovens. Hot air ovens use dry heat, high temperatures and longer times to achieve the same result. Both achieve the same result, but do it in very different ways.
Glassware can be placed in metal tray and finally in the hot air oven. All these can be heated at 160°C - 1 70°C for 2-4 hours. These are then removed from the oven and cooled. Paper or cotton should not be kept directly in the oven as these may be charred.
Hot-air is increasingly deployed in industrial processes. Typical applications include activating, heating, curing, melting, shrinking, welding, sterilizing, drying and warming to name a few.
So what is an air frying oven? Air frying is a method of cooking that circulates hot air inside your oven at a high speed through the use of convection fans. This cooks food faster and creates a crispy, fried layer and even-browning on all sides using little to no oil compared to traditional deep frying.
Autoclaving is the most popular method of lab sterilization. This process uses pressurized steam to heat the item that requires sterilization. Autoclaving is an incredibly effective procedure. It will effectively kill all microbes, spores and viruses.
Physical sterilisation method in which heat-resistant medical devices are exposed to dry heat. To ensure the killing of all microorganisms (bacteria, fungi, viruses, and spores) the temperature has to be at least 180 °C for a time period of at least 30 minutes.
Compared to dry heat, steam sterilization is more efficient because moisture is a superior heat conductor and can better penetrate the load.
DISADVANTAGES OF HOT AIR OVEN
1) Approach that takes a long time since heat penetration and germ death happen slowly. 2) Most material cannot be with stand high temperature for example, plastic and rubber products cannot be dry heated Sterilized because the temperatures employed (160°-170°c) are to high for them.
Hot air drying is the most common drying method as of today. It is simple and effective for sturdy industrial and food products and an inexpensive solution.
It is not possible to achieve very low residual moisture with hot-air dryers. It is theoretically possible to increase drying temperature, especially for materials with high initial moisture content; however, there is a risk of thermal damage to the material.
There are several benefits of using a hot air oven in a laboratory setting. First, hot air ovens can Sterilize quickly and effectively. Second, they can be used to sterilize a wide variety of materials, including glassware, metals, and plastics.
Incubators generally control temperature between 30°C and 60°C. An oven will be required for temperatures 70°C up to 250°C. If you require temperatures up to 300°C then you will need to have a look at our High Temp Oven range. For temperatures below 30°C, it is recommended you look at our refrigerated incubators range.
1) Ensure that the fan is in working condition during the operation. 2) Do not spill any chemical or water on the tray of oven. 3) Tong should be use to place/remove the glassware or any material from the oven. 4) Ensure that the Exhaust blower is ON before starting the oven.
Most labs use autoclaving as their laboratory sterilization method of choice, using pressurized steam to heat the material to be sterilized. This is a very effective method that kills all microbes, spores, and viruses, although for some specific bugs, especially high temperatures or incubation times are required.
Hot Air Oven
It uses dry heat to sterilize suitable laboratory materials. It is also known as forced air circulating ovens. It was developed by Pasteur. It can kill bacteria and spores by dehydrating them with dry heat.
Tyndallization, also called fractional sterilization and discontinuous heating, is a form of sterilization that involves boiling the goods to be sterilized in their cans or jars at 100 degrees Centigrade for about 15 to 20 minutes a day, for three days in a row.