handmade natural soap

1. The Purpose of Stability Test

Meeting the needs and expectations of the customers who use the product is important for quality stability of all cosmetic products, like any other produced goods.
Also, quality guarantee that considers the various distribution channels from the maker to the customers and actual period of usage is just as important.
Therefore, the purpose of the stability test is to adequately assess the chemical stability of the manufactured and non-medicinal goods in the research and development phase and manufacturing phase and to set the design goals of the product.

2. Testing Method

Stability of the manufactured goods and various guarantee test

1. Temperature stability test
Observe and quantify the changes in the samples after placing the cosmetics at a specific temperature.
·Temperature
-10℃, -5℃, 0℃, 25℃, 실온, 30℃, 37℃, 45℃, 50℃, 60℃ and more
·Observations
Color difference, changes in color, spots, foreign body, suspension, separation, precipitation, gelation, clarity, mold, etc.

2. Light stability test (Light resistance)
In case of displaying the cosmetic at the stores, the cosmetic is often displayed under direct light or placed inside a show window over a long period of time.
Thus, it is essential to test that the contents inside the case is stable against the light
·Outdoor(daylight) Exposure test
Set the conditions to be the sun during a mid-summer day for the duration of days, weeks and months
·Artificial light exposure test
Testing method considering that the majority of cosmetic display is inside a show window
·Indoor (artificial light) exposure test
Observe the changes in the contents after constant exposure indoors

3. Special, Extreme Preservation Test
Stability of a cosmetic must be maintained until the customer uses up the product, and therefore, the cosmetic must undergo extreme temperature tests that shortens the duration of high or low temperature.
This extreme preservation test is also called acceleration test, and it observes the chemical or physical changes that occur to a cosmetic due to concentrated load of energy changes such as temperatures or vibrations.
·Temperature, humidity test
50℃, 40℃ - 75%, 37℃ - humidifying test, etc.
·Cycle Temperature Test
To mimic the changes of temperature of the year or days, a cycle of different temperatures is run to observe the changes in the sample
·Stress Test
Method of predicting the manufactured good's stability expectancy by exerting certain amount of stress to the samples

Stability of chemicals and testing methods
Non-medicinal goods are what is between medicines and cosmetic and includes medicinal face water, latex, deodorant, cream, sunscreen, powder, soap, bath products, hair tonic, hair growth promoter and shampoo. In the design of a non-medicinal product, the stability of compounds in the compound drugs is important, and the stability is tested with accelerated test at 40℃(±1℃) 75% RH (±5℃) for duration of more than 6 months as set in the standards established for medicinal goods.

Guarantee of stability considering the actual use
The premise of cosmetic's stability is that it needs to meet the needs and expectations of the customers during the consumption of the good. Therefore, it is essential to guarantee the quality (stability and safety) considering the actual time when the customers use the product.

·Soap, cleansers
Swelling due to mixing or deposition of water, viscosity degradation, changes in usability, changes in scent, etc.
·Bath preparations
Anti-septicity of the water after the use of bath preparations, ingredient's and compound chemical's influence on the bathtubs, etc.
·Aerosols
influence due to volatile composition in household, gas leak, etc.
·Sunscreens
Salt accumulation in clothing, swimsuits during workout, detersiveness, discoloration due o light, etc.

Quality Control unit Thank your for visiting the Medicostech website.

handmade natural soap

Quality Control unit
Thank your for visiting the Medicostech website.