## Step 4: SPF Table

If using the zinc oxide or titanium dioxide separately, use the following table to determine your measurements.
I don't have a chart for using the blended powder, but it starts off with SPF35 on its own.

For example, 8oz. (weighed) of lotion + .8oz of titanium micronized dioxide (weighed) = SPF20+
The Micronized TD is 10% of the original amount of lotion used (not the finished weight).

If you used 8oz of lotion + .8oz of Micronized ZO, the SPF would be 11-12.

If it's still too confusing, ask!

 Concentration of Sunscreens & SPF Low (SPF 2-5) Moderate(SPF 6-11) High(SPF 12-19) Ultra High(SPF >20) Titanium Dioxide <4 % 8 % 12 % 20 % Titanium Dioxide, Micronized 2 % 4 % 6 % 10 % Zinc Oxide 5 % 10 % 15 % 25 % Zinc Oxide, Micronized 3 % 7.5 % 12 % 20 %

This chart is to provided by my supplier. I can not do any testing internally. Just to be used as a guideline.
<p>Hello! If my batch of lip balm weighs 64 ounces, how much zinc oxide would I need to add to get an spf of 20? Is their a formula I can use to calculate this? I see I would need 25% zinc to get spa 20 but what is the calculation? Thanks</p>
<p>Hey Brenda, did you ever figure this out? I'm trying to make an SPF lip balm and am struggling with finding a formula </p>
<p>Hi--i'm not the author, but in making sunscreen, you calculate by weight. Usually they say that 20% zinc = SPF 20, so you would use a food scale and add ~13 oz by weight of zinc to 64 oz by weight of balm!</p>
<p>Much appreciated! Now I feel confident I can make this :) thanks! </p>
<p>&quot;manufacturers have to respect the 25% limit (of titanium dioxide nanoparticles) according to European legislation&quot;. (Micronized TD is 15 nanometers in particle size; it is considered a &quot;nano&quot; particle)</p>
<p>This is an awesome informational tutorial however the lack of response from the author is quite sad . Might as well disabled comments if you'll never reply to any questions from your readers. </p>
<p>So, sounds like your saying use lotion to zinc oxide 4 to 1 would make spf-20, right?</p>
I bought some Zinck oxide from our local pharmacy. Is this safe to use?
<p>I'm about to put in an amazon order for the ingredients I need, but I'm wondering about the thickness of this stuff. Does the beeswax thicken it up enough that it won't turn into straight liquid on a hot sunny day? I'm looking for lotion consistency, not tanning oil consistency.</p><p>Thanks for the recipe!</p>
<p>With my experence with homemade lotions, this will get thinner as it heats up. you can always melt it back down and add more beeswax to get a thicker product on hot days.</p>
<p>If I use 2 cups of olive oil, 1 cup of coconut oil, 1 cup of beeswax then how much zinc oxide do I use . I used 8 tbsps. . is this too much?</p>
<p>I purchased a mineral sunscreen what lists 8% TiO2 as the only active ingredient and the product is labeled spf 25.. why?</p>
Does it actually work I have a brother who burns sooo easily I want to make sure he's protected
<p>we have lots of coconut in the area, and can easily extract coconut oil. Can I use it as base/carrier?</p>
<p>I made it. was so white on the skin.. Gonna try again using less zinc</p>
Does anybody know how to mix the &quot;Coppertone&quot; fragrance? If I oculd add that fragrance, then the sunscreen would be perfect-a-mundo.
This is a great instructable! I'm looking at making my own as I am allergic to almost all commercial sunscreens. I was wondering if you know/have any advice about whether a silicone base would work? I use 100% silicone as a moisturiser because it's one of the only things I have found that doesn't irritate my skin. I can't see any reason it wouldn't work as a base and I know that it is in some comercial sunscreens already but I thought I'd see what you have to say about it anyway because you seem to be in the know. I think one of the best things about using silicone as a base would be that you could easily see if the active ingredient is incorporated properly because it starts clear and would become cloudy with the addition of the zinc. I would also expect it to last longer than other bases being a polymer which would be very unlikely to harbour and feed bacteria or other nasties. <br> <br>I also wanted to point out that in my research I've found that powder screens are somewhat dangerous because of the likelihood of inhalation. I originally planed to make a powder because it seemed easier and I hate the feeling of putting on greasy sunscreen in the middle of summer but have decided against that because of this health risk. <br> <br>Thanks for your time, eagerly awaiting a reply :)
Is it possible to get like spf 100 or more or how do i get a tpf 100 or more? meaning i don't want to get a tan or a sunburn...my skin is tanned as it is :-)
Much more important than SPF rating is using the right type of sunscreen and using it wisely. This instructible is right-on in using zinc and titanium dioxide. They are the best sunscreens and they do not lose effectiveness over time. The effectiveness of other sunscreens decays on the shelf, and they lose their effectiveness in time after they are applied. It's also important to apply enough. Use enough so that the white color of the zinc and titanium just barely disappears. <br>I'm an endurance cyclist and will sometimes be on the bike from sunrise to sunset, and I won't touch any sunscreen other than zinc/titanium combos. BTW, one of those ingredients is better for UVA, and the other is better for UVB, but I don't remember which is which. Here's more info: <br>http://www.oleda.com/oleda_tips/tips.asp?dept=134
thanks...i will try and find the ingredients and make this...btw...is this water proof? the only time i stay long in the sun is when i take my kids swimming!
I tried a recipe very similar to this that I adapted from a few sites, including this one. I must say, I was pleasantly surprised! The homemade sunscreen works really well, and I'm not worried about crazy chemicals that might be in it! My recipe is a little different - I put some green tea in it and some Aloe Vera. Also I found out that it helps sunburn too!! Here's the recipe I used - <br>http://mothernaturesmaid.wordpress.com/2012/06/07/whats-your-spf/ <br> <br>Thanks for the tips!!!!
I recently had a VERY bad reaction when wearing bergamot in the sun. After a little research, it turns out that essential oils from the citrus family photosensitize the skin - especially bergamot, lime and bitter orange. Apparently though, if the oil is highly diluted the risk is largely negated. I wouldn't risk it though! My skin reaction was so severe, it's taken over a month for it to heal.
ditto to lostandlau info <br> <br>I was going to post the same thing about using orange oil- as it is photosensitizing. Yes, same amounts may be safer but it counterintuitive to add something photosensitizing to a sunscreen. While sweet orange is not, there is concern that one may not ensure sweet orange is used. <br> Also, all citrus oils should be avoided for those with sensitive skin. <br> <br>Love essential oils but perhaps a warning to research which oils are least irritating. And always safest to avoid any essential oils on babies.
I buy a bergaptene free bergamot that reduces the risk of photosensitization from camdengrey.com to use in my skincare products, so i do not have to work about avoiding sun exposure.
Good point. I hope everybody takes note of this. Apparently, a popular perfume of the 70s was Shalimar, and someone in my family had a story about a terribly burned neck, where she had applied it. Thanks for sharing this warning lostandlau
Thank you for this instructable I'm very excited to try it!! <br> <br>However I'm very confused . . . is the percentage the percentage of the lotion? so for example use 25% of the overall weight of the lotion zinc oxide and that would be SPF 20?
hi. thanks for this recipe! Might anyone know a UK-based shop where I can get Zinc Oxide from?
Hi I was wondering if there's a way to make the lotion last longer than 3 months. Thanks for the recipe though. :)
I've been wanting to create my own Sunscreen, so this recipe sounds great. Wanted to know a couple of things. If I wanted SPF30+, I work outdoors and have been using the Sport brands of sunscreen, what would the mixture be? For scents instead of using scented oils, I'm a guy so smelling like an orange or strawberry doesn't really make me comfortable though smelling like a coconut doesn't bother me (go figure), anyways can I add my favorite cologne instead or does that mess up the chemical reactions? Otherwise I really want to try this Sunscreen.
there is no need for SPF 30 because <span style="font-size: 11.0pt;color: red;line-height: 115.0%;">SPF15</span><span style="font-size: 11.0pt;line-height: 115.0%;"> sunscreen blocks about <span style="color: red;">93%</span> of UVB rays, <span style="color: rgb(0,176,240);">SPF30</span> sunscreen blocks about <span style="color: rgb(0,176,240);">97%</span> of UVB rays and an <span style="color: rgb(0,176,80);">SPF50</span> blocks <span style="color: rgb(0,176,80);">98%</span> of UVB rays. So SPF30 sunscreen <strong>does not</strong> give you twice the protection of SPF15 sunscreen! And an SPF50 sunscreen is only 1% more effective than an SPF30 sunscreen. In fact, the FDA (the US agency that governs drugs like sunscreens) does not allow any sunscreen to be labeled as anything higher than SPF30+ because they know that higher SPF sunscreens do not offer significantly greater protection, and that such products are misleading to consumers. Currently any sunscreen labeled with and SPF greater than 30 (or without a 'Drug Facts' label) is 'misbranded' under Section 502 of the Federal Food, Drug &amp; Cosmetic Act</span><br /> Dr. Hanan
Actually, I'm a 100% white guy (a &quot;1&quot; on the scale of whiteness - the standard by which all other whiteness is measured) and I burn very quickly with anything less than SPF 50. I've been described as &quot;translucent&quot; - lol. While SPF 30 may be enough for most people, some people with very fair skin need a lot more protection because most fair-skinned people don't have much natural protection in the form of melanin . In *theory* SPF 15 is fine - but in practice - not for everyone. I've actually gotten pretty burned on a rainy day - lol. Strange but true.... The only downside to mixing your own sunscreen that I can see is the lack of sweat-resistance - but for day-to-day exposure, this is great!
That's because of the amount used, when higher the SPF, higher the amount of sunscreen/sunblock ingredient used. It's like you're completely coating your skin in such ingredient. I would recommend you definitely should use a zinc oxide based sunblock if you're not using it, it forms a coat on your skin that's even visible, that's why many people complains that physical sunblocks leave a white cast on their skin, but surely you, with your pale skin won't have that problem, and it blocks the rays, won't absorb them like sunscreen does, so it definitely works much better at protecting.
I'm like you, I need extremely high SPF. I've finally, in the past few years, taken to wearing a shirt over my bathing suit, even in the pool and ocean. It's the only way I don't burn!
Actually, SPF30 _does_ give you twice the protection. With SPF15, you get 1/15 the UV of no sunscreen (blocks 14/15, lets 1/15 through). ~93% is 14/15, and the ~7% remaining is the 1/15 that's allowed through. With SPF30, 29//30 is blocked and 1/30 of the UV is allowed through. SPF15 allows 2/30 (1/15) through, so, yes, SPF30 allows half the UV through that SPF15 does. Does it block twice as much? No. But that's misuse of math. What matters with sunscreen is how much it allows _through_. SPF15 lets twice as much UV get to your skin as SPF30. With SPF50, only 1/50 of the original rays are allowed through, meaning SPF50 will allow you to stay out over three times as long as SPF15 for a given UV dose.
@jsw, anyway, the point is that no SPF can fully block the UV rays and the difference of protection between an SPF30 and an SPF50 is actually minimal, it will always allow some amount of radiation through. So I do also consider that &quot;SPF50&quot; stuff as misleading, because people do actually believe that when higher the SPF, better the protection, and they can go under the sun as much as they want because they're &quot;well protected&quot; and that's just not true. What they don't know, is that not only a sunscreen needs to be reapplied frequently to really be well protected, but that also IS necessary to be out of sun as much as possible because any SPF will allow at least a small amount of UV radiation to pass through, and it will definitely accumulate during all that time they're under the sun, causing obvious skin problems. If not properly covered from the sun, not even an SPF100 can do that job.
One of the big lotion manufacturers (maybe Aveeno?) just started advertising SPF 100...
Hi Jax69. I am no expert but it appears to me that if you up-specked the ingredients you would get spf 30+. that being said, i don't know how much would be too much.. (could you make spf 400+ <which is probably a shed>) As for the cologne, my thinking is that you could scent it with any thing you liked, but the alcohol/solvent base in the cologne might be too harsh for your facial skin (more sensitive) cheers, good luck.
A recent study shows that titanium dioxide powder can be harmful. Although harmless in the lotion, the powder can be inhaled and if so, penetrate the brain-blood barrier. http://www.environmentalhealthnews.org/ehs/newscience/nanoparticles-damage-brain-cells/<br><br>So I'd deal with zinc oxide instead. <br>One should also keep in mind that sunblocks do not only contain UV reflecting substances, but UV absorbing organic compounds as well, so I'd avoid sunlight exposure, actually, and wear the sunscreens from the drugstore, really.
That's ridiculous. How can you recommend using sunscreen from the drugstore. Who says they're better? There are studies that prove actually that no chemist-made sunscreen agent has better UVA-UVB protection than zinc oxide. Most people already know that titanium dioxide is harmful and not just that, also, that creates free radicals when exposed to UV radiation, I even figured out this because I read everywhere from people that wanted to avoid titanium dioxide as much as possible and I was curious why, so I did some research. So, tell your ignorance, that because sunblocks containing titanium dioxide can be harmful, won't mean that chemical sunscreens are better. I'd rather to deal with a titanium dioxide sunblock coated with silica, that prevents the reaction of it with UV radiation, than dealing with a chemical sunscreen full of gross stuff in it that actually can harm more than prevent. <br>The best stuff one can use is zinc based only sunblock, and preferably with nice all-natural ingredients, like the Badger ones.
when I use sunscreen with zinc I cant get it off for days, I get tons of pimples, and i cant even run my hand through my hair without it getting stuck. I'd really appreciate any suggestions on how to wash it off or on another natural ingredient that would work as well as the zinc.<br>I loved finding this instructable because it had never occured to me that anyone can make their own.THANK YOU!
I found this post very interesting and scientifically correct, but I would advise to use ZnO rather than TiO2 because Zn is essential element in enzymes which are responsible for repairing skin wounds and synthesis of calogen. Keep up with good work...<br><br>PhD in chemistry
years ago --I worked in a health food store and we sold --para-aminobenzoic acid in a tube for sun block--its a B vitamin if I remember right and it really worked for people--back then they just put it on their noses---LOL!!! <br>
If you are looking for Zinc and Titanium oxide I sell it at my shop Called Apothecary in Thyme 2531 Broadway #D1 Everett, WA 98201 425-252-6533 I do mail things out UPS and Fedex and USPS so give me a call if you are in the need
Does this one turn rancid? Looking to make a lotion that does not have to be refrigerated. Please help me out with the ration on the zinc also...I will be making 8 oz bottles. I stink at math!!!! Help!!! Thanks!!!<br>
I'm not going to do it. I don't believe in sunscreen.
Are you saying you don't believe that sunscreen prevents cancer, or do you not believe that the sun causes cancer? I don't know where you live or your ethnicity, but here in Australia, using sunscreen is the NORM for the summer months. We have a whole generation of caucasian people now facing melanoma (a skin cancer) who didn't believe in using suncreen during the 50s/60s/70s.
Just read about the ban in UK for teenagers to use the sunbeds. Not the same thing, but obviously these are serious things and the damage is irreversible! <br><br>http://www.dermundo.com/www.bbc.co.uk/news/health-12998030<br><br>In addition to using the sunscreen lotion, our kids wear Nammu swimming hats (protective while swim), and also when the Sun is really strong, the UV protective t-shirts. Better safe than sorry! I will try the recipe and make my own sunscreen! Strongly believe in it, and thanks for the instructable!
I agree I think the sunscreens cause more harm than good.
Unfortunately, you are wrong. Proper, quality sunscreen is highly recommended by physicians. Unless you are allergic to an ingredient in the sunscreen, there is no harm, only good. If you are allergic, talk to your physician and they will help you find a version on the market which will work for your skin. Skin cancer is a serious problem, and the best solution is proper protection. While clothing and shade are good, people looking to be active out in the sun will find these encumbering, and a good sunscreen is just the ticket. Even still, sunscreen is recommended along with clothing cover and shade. Don't be silly. Wear your sunscreen.
You mean western doctors? Chemicals on the skin are an irritant and cause for many cancers. Wait, you didn't know that? I know one thing most people don't and that is that cancer is caused by a lot of thing, but mostly chemicals that are unnatural and cause unnatural immune responses. All cancer is a cell with its switch turning on. That is it. Anyway, moderation of anything, including the sun, but you also need that sunlight for proper health. So, no, sunscreen isn't necessary, unless of course you abuse the sun like you abuse your body by stuffing it with chemically preserved foods and unhealthy fats. Don't be silly. Common consensus doesn't work everyone, considering we are all completely different.