Hello Thanks for all your information, you are so helpful. I am in the process of completing stability testing, and I’m struggling with checking the PH levels with strips. Would you recommend a probe? Thanks 😊
Yes, digital pH meters will always give a much more accurate result. I’d recommend on that can take the pH of creams and liquids so you don’t need to dilute as it’s more accurate. I have the one I use linked in my Amazon storefront linked below I think.
Hello, thank you for your useful information. I try to build a small lab for cosmetics. I am going to buy an incubator and a centrifugal machine for stability tests. If I do 1. thaw fridge cycles -20 celcius 2. incubator stability test +50 celcius and also 4000rpm for 30 minutes in a centrifugal machine, is that stability tests enough?
For products containing water you would need to send to a lab. You cannot do challenge testing yourself. However using those things for your own stability testing prior to that and for testing batches is a good idea.
Yes you can stability test at home, but challenge testing at a lab must be done for aqueous products. You can be sure they’ll pass by do your own Microbio tests first, I did a video on this called ‘are your cosmetics safe?’ 😊
If making a natural deodorant, If we do the freeze test you explained and after 3 times there's no changes, can we use the 6 month logo without needing to pay a lab to test ?
Yes, so long as it’s an anhydrous formulation. If it contains water you’d need to send to a lab for challenge testing. No matter water you still need a CPSR, and you’ll give your stability information as part of this.
@revegacosmetics Do you know where to find the information for essential oil % for leave on products? I had been working to 1% essential oils for my CPSR test but I read that some essential oils are only allowed at lower doses. We're struggling to find this information.
@@tonytajine You need the IFRA and Allergen documents for your chosen oils - find those on your supplier website. Then look on the IFRA document for the particular oil and see what the max % usage rate is for the type of product that you are making. If blending two different ones together, keep the max % as a total for both together (not separate) and lower is usually better as they can be strong. The Allergen document will then tell you what allergens are present in the near fragrance oil. You need to work out what percentage they present at in your finished formula. I have a video on that on my channel.
Surely you would give a BBE date for Anhydrous cosmetic product? As shouldn’t it be the shortest BBE date of the ingredients used, as they could potentially go rancid, what happens if you put 6 months PAO on the product, someone could buy a product , not open for it 2/3 or even 5 years then open it surely it wouldn’t last 6 months after opening, as it potentially has gone rancid already after that time depending on the type of oil used and the original BBE of the ingredient?
You make a good point. In the UK we base our use by dates on stability test data, not the individual ingredients and PAO is common assuming a sell-through rate and a customer purchasing and using straight after. If I'd purchased a product 5 years ago with a PAO of 12 months, I wouldn't be opening and using. Some products I purchase seem to have one or the other, others have both. I'd say if the product contains a lot of natural products as you mention then a Use by is the better option.
I still don’t understand how you can put 6 months, 12 months pao on a anhydrous product if the shelf life of an original ingredient is shorter than that, you might not open and use it after that long but some people might and that is basically what it is saying though isn’t it, it’s ok for 6 months after you’ve opened it regardless of the manufacture date
@irl20112011 You don;t always put PAO, if a use by date is the best option, like for the products you mention. It's usually recommended by the CPSR assessor or lab doing testing. But, yes, I get what you are saying... I'll link this so you can read/interpret the official regs www.gov.uk/government/publications/cosmetic-products-enforcement-regulations-2013/regulation-20091223-and-the-cosmetic-products-enforcement-regulations-2013-great-britain
I have read people using an egg incubator and it was on a product testing formulation sight,I just bought one from amazon to test it lol
Hello
Thanks for all your information, you are so helpful.
I am in the process of completing stability testing, and I’m struggling with checking the PH levels with strips. Would you recommend a probe?
Thanks 😊
Yes, digital pH meters will always give a much more accurate result. I’d recommend on that can take the pH of creams and liquids so you don’t need to dilute as it’s more accurate.
I have the one I use linked in my Amazon storefront linked below I think.
Loving your videos very informative. Thankyou.
Thanks, glad you like them :)
Thanks for providing such information
Hello, thank you for your useful information. I try to build a small lab for cosmetics. I am going to buy an incubator and a centrifugal machine for stability tests. If I do 1. thaw fridge cycles -20 celcius 2. incubator stability test +50 celcius and also 4000rpm for 30 minutes in a centrifugal machine, is that stability tests enough?
For products containing water you would need to send to a lab. You cannot do challenge testing yourself. However using those things for your own stability testing prior to that and for testing batches is a good idea.
Is it possible to stability test emulsions such as face creams or lotions at home?
Yes you can stability test at home, but challenge testing at a lab must be done for aqueous products. You can be sure they’ll pass by do your own Microbio tests first, I did a video on this called ‘are your cosmetics safe?’ 😊
If making a natural deodorant, If we do the freeze test you explained and after 3 times there's no changes, can we use the 6 month logo without needing to pay a lab to test ?
Yes, so long as it’s an anhydrous formulation. If it contains water you’d need to send to a lab for challenge testing.
No matter water you still need a CPSR, and you’ll give your stability information as part of this.
@revegacosmetics Thanks, you've made my day!!! I really appreciate your reply 🙏
@revegacosmetics Do you know where to find the information for essential oil % for leave on products? I had been working to 1% essential oils for my CPSR test but I read that some essential oils are only allowed at lower doses. We're struggling to find this information.
@@tonytajine You need the IFRA and Allergen documents for your chosen oils - find those on your supplier website. Then look on the IFRA document for the particular oil and see what the max % usage rate is for the type of product that you are making. If blending two different ones together, keep the max % as a total for both together (not separate) and lower is usually better as they can be strong. The Allergen document will then tell you what allergens are present in the near fragrance oil. You need to work out what percentage they present at in your finished formula. I have a video on that on my channel.
@@revegacosmetics Thanks!! You've just gained a new follower 🥳
Surely you would give a BBE date for Anhydrous cosmetic product? As shouldn’t it be the shortest BBE date of the ingredients used, as they could potentially go rancid, what happens if you put 6 months PAO on the product, someone could buy a product , not open for it 2/3 or even 5 years then open it surely it wouldn’t last 6 months after opening, as it potentially has gone rancid already after that time depending on the type of oil used and the original BBE of the ingredient?
You make a good point. In the UK we base our use by dates on stability test data, not the individual ingredients and PAO is common assuming a sell-through rate and a customer purchasing and using straight after. If I'd purchased a product 5 years ago with a PAO of 12 months, I wouldn't be opening and using. Some products I purchase seem to have one or the other, others have both. I'd say if the product contains a lot of natural products as you mention then a Use by is the better option.
I still don’t understand how you can put 6 months, 12 months
pao on a anhydrous product if the shelf life of an original ingredient is shorter than that, you might not open and use it after that long but some people might and that is basically what it is saying though isn’t it, it’s ok for 6 months after you’ve opened it regardless of the manufacture date
@irl20112011 You don;t always put PAO, if a use by date is the best option, like for the products you mention. It's usually recommended by the CPSR assessor or lab doing testing. But, yes, I get what you are saying... I'll link this so you can read/interpret the official regs www.gov.uk/government/publications/cosmetic-products-enforcement-regulations-2013/regulation-20091223-and-the-cosmetic-products-enforcement-regulations-2013-great-britain