Question about TH product

Question

เคยผสมโลชั่นกันแดดโดยใช้ [url=http://www.myskinrecipes.com/shop/spf-sunscreen/535-high-uva-uvb-protection.html:1sai5u6r]SPF Protect Ultra[/url:1sai5u6r] ตามสูตร 2 ด้านล่าง จะได้โลชั่นน้ำนมที่ทาง่าย

ลองผสมโลชั่นกันแดดโดยใช้ [url=http://www.myskinrecipes.com/shop/spf-sunscreen/535-high-uva-uvb-protection.html:1sai5u6r]SPF Protect Ultra[/url:1sai5u6r] II ตามสูตร 1 ด้านล่าง แต่ได้ครีมที่มีเนื้อข้นมากๆ ต้องใส่กระปุก แทนขวดปั๊ม ดังนั้นควรจะปรับสูตร 1 อย่างไรให้ได้เนื้อโลชั่นน้ำนมที่เกลี่ยง่ายคะ?

หากต้องการเพิ่มค่าป้องกันรังสี เป็น SPF 50 PA++++ ควรปรับสูตรเป็นอย่างไร?

1) [url=http://www.myskinrecipes.com/shop/%E0%B8%95%E0%B8%B1%E0%B8%A7%E0%B8%97%E0%B8%B3%E0%B8%A5%E0%B8%B0%E0%B8%A5%E0%B8%B2%E0%B8%A2/838-%E0%B8%99%E0%B9%89%E0%B8%B3%E0%B8%81%E0%B8%A5%E0%B8%B1%E0%B9%88%E0%B8%99%E0%B8%9A%E0%B8%A3%E0%B8%B4%E0%B8%AA%E0%B8%B8%E0%B8%97%E0%B8%98%E0%B8%B4%E0%B9%8C.html:1sai5u6r]Water[/url:1sai5u6r] Resistant Sunscreen II (SPF 50 PA++ ) Improved Formula
%
ส่วนน้ำมัน
[url=http://www.myskinrecipes.com/shop/emulsifier/726-water-in-oil-serum.html:1sai5u6r]Water-in-Oil EZ[/url:1sai5u6r] 4.0%
[url=http://www.myskinrecipes.com/shop/spf-sunscreen/535-high-uva-uvb-protection.html:1sai5u6r]SPF Protect Ultra[/url:1sai5u6r] II 15.0%

ส่วนน้ำ
[url=http://www.myskinrecipes.com/shop/%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B8%81%E0%B8%B1%E0%B8%99%E0%B9%80%E0%B8%AA%E0%B8%B5%E0%B8%A2/928-optiphen-plus.html:1sai5u6r]Phenoxyethanol SA[/url:1sai5u6r] 1.0%
[url=http://www.myskinrecipes.com/shop/%E0%B8%95%E0%B8%B1%E0%B8%A7%E0%B8%97%E0%B8%B3%E0%B8%A5%E0%B8%B0%E0%B8%A5%E0%B8%B2%E0%B8%A2/838-%E0%B8%99%E0%B9%89%E0%B8%B3%E0%B8%81%E0%B8%A5%E0%B8%B1%E0%B9%88%E0%B8%99%E0%B8%9A%E0%B8%A3%E0%B8%B4%E0%B8%AA%E0%B8%B8%E0%B8%97%E0%B8%98%E0%B8%B4%E0%B9%8C.html:1sai5u6r]Water[/url:1sai5u6r] 80.0%

2) [url=http://www.myskinrecipes.com/shop/%E0%B8%95%E0%B8%B1%E0%B8%A7%E0%B8%97%E0%B8%B3%E0%B8%A5%E0%B8%B0%E0%B8%A5%E0%B8%B2%E0%B8%A2/838-%E0%B8%99%E0%B9%89%E0%B8%B3%E0%B8%81%E0%B8%A5%E0%B8%B1%E0%B9%88%E0%B8%99%E0%B8%9A%E0%B8%A3%E0%B8%B4%E0%B8%AA%E0%B8%B8%E0%B8%97%E0%B8%98%E0%B8%B4%E0%B9%8C.html:1sai5u6r]Water[/url:1sai5u6r] Resistant Sunscreen (SPF 50 PA++++ )
%
ส่วนน้ำมัน
[url=http://www.myskinrecipes.com/shop/emulsifier/726-water-in-oil-serum.html:1sai5u6r]Water-in-Oil EZ[/url:1sai5u6r] 4.00%
[url=http://www.myskinrecipes.com/shop/spf-sunscreen/535-high-uva-uvb-protection.html:1sai5u6r]SPF Protect Ultra[/url:1sai5u6r] 20.00%
[url=http://www.myskinrecipes.com/shop/emollient-%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%9E%E0%B8%B4%E0%B9%88%E0%B8%A1%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%99%E0%B8%B8%E0%B9%88%E0%B8%A1%E0%B8%A5%E0%B8%B7%E0%B9%88%E0%B8%99/530-isononyl-isononanoate.html:1sai5u6r]LipidSoft Lite[/url:1sai5u6r] 15.00%

ส่วนน้ำ
[url=http://www.myskinrecipes.com/shop/%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B8%81%E0%B8%B1%E0%B8%99%E0%B9%80%E0%B8%AA%E0%B8%B5%E0%B8%A2/928-optiphen-plus.html:1sai5u6r]Phenoxyethanol SA[/url:1sai5u6r] 1.00%
[url=http://www.myskinrecipes.com/shop/%E0%B8%95%E0%B8%B1%E0%B8%A7%E0%B8%97%E0%B8%B3%E0%B8%A5%E0%B8%B0%E0%B8%A5%E0%B8%B2%E0%B8%A2/838-%E0%B8%99%E0%B9%89%E0%B8%B3%E0%B8%81%E0%B8%A5%E0%B8%B1%E0%B9%88%E0%B8%99%E0%B8%9A%E0%B8%A3%E0%B8%B4%E0%B8%AA%E0%B8%B8%E0%B8%97%E0%B8%98%E0%B8%B4%E0%B9%8C.html:1sai5u6r]Water[/url:1sai5u6r] 60.00%

MySkinRecipes Expert · Accepted Answer

Adjusting Sunscreen Lotion Formula for Lighter Texture and SPF 50 PA++++

You've experienced a common issue when formulating with Water-in-Oil EZ; surprisingly, higher water content can lead to a thicker consistency. Your Formula 1, with 80% water, resulted in a thick cream, while Formula 2, with 60% water and SPF Protect Ultra, yielded a milk lotion.

To achieve a lighter, milkier texture suitable for a pump bottle and increase the protection to SPF 50 PA++++ using SPF Protect Ultra III, you can modify your Formula 1 as follows:

Proposed SPF 50 PA++++ Milk Lotion Formula

Oil Phase:
- Water-in-Oil EZ: 4.0%
- SPF Protect Ultra III: 20.0%
- LipidSoft Lite: 10.0%
Water Phase:
- Water: 64.0%
- Phenoxyethanol SA: 1.0%
- Magnesium Sulfate: 1.0%

Explanation of Changes:

Reduced Water: Decreasing the water content from 80% to 64% helps to reduce the overall viscosity and achieve a lighter texture, as indicated by the behavior of Water-in-Oil EZ and your experience with Formula 2.
SPF Protect Ultra III (20%): Replacing SPF Protect Ultra II with SPF Protect Ultra III at 20% is recommended to achieve SPF 50 and likely PA++++ protection. SPF Protect Ultra III is designed to provide high UVA/UVB protection at this concentration.
LipidSoft Lite (10%): Adding this light emollient will improve the spreadability and feel of the lotion, contributing to the desired milkier texture, similar to its role in your successful Formula 2.
Magnesium Sulfate (1%): It is recommended to include Magnesium Sulfate when using Water-in-Oil EZ in water-in-oil emulsions to enhance formula stability and prevent separation.

Mixing Instructions:

Combine Water-in-Oil EZ, SPF Protect Ultra III, and LipidSoft Lite in the oil phase. Heat this phase to 70-80°C and blend or stir until fully homogeneous.
In a separate container, combine Water, Phenoxyethanol SA, and Magnesium Sulfate in the water phase. Heat the water to 60-70°C.
While continuously blending the oil phase, gradually add the heated water phase in small increments. Continue blending for at least 15 minutes after all the water has been added to ensure a stable emulsion is formed.

This adjusted formula should provide the desired SPF 50 PA++++ protection with a lighter, more pourable texture.