Sun protection products should be sufficiently effective against UVB and UVA rays to ensure a high level of public health protection. UVA and UVB protection therefore need to be linked in order to optimize product development and comply with regulatory requirements.<\/p>\n
WENEOS is dedicated with expertise and passion to guiding its customers in submitting reliable data to regulatory authorities.<\/p>\n
To this end, to ensure broader protection, regulations recommend a critical wavelength of at least 370 nm, or a minimum UVA:UVB ratio.<\/p>\n
The critical wavelength is expressed as the wavelength at which the integral of the absorption spectrum curve starting at 290 nm reaches 90% of the integral between 290 and 400 nm.<\/p>\n
The UVA:UVB ratio is expressed as the ratio between the integral of the absorption spectrum curve in UVA (between 320 nm and 400 nm) and in UVB (between 290 nm and 320 nm).<\/p>\n
[\/et_pb_text][et_pb_button button_url=”mailto:commercial@weneos.com” button_text=”Request a quote” _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_3,1_3,1_3″ _builder_version=”4.24.2″ _module_preset=”default” background_color=”#f4f0ec” width=”100%” max_width=”2560px” module_alignment=”center” custom_margin=”||||false|false” custom_padding=”50px||50px||false|false” global_colors_info=”{}”][et_pb_column type=”1_3″ _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_number_counter title=”days for an in vitro study with a final report” number=”7″ percent_sign=”off” _builder_version=”4.24.3″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_number_counter][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_number_counter title=”solar studies carried out” number=”+25000″ percent_sign=”off” _builder_version=”4.24.3″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_number_counter][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_number_counter title=”compliance with solar standards” number=”100″ _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_number_counter][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.24.2″ _module_preset=”default” background_enable_color=”off” custom_padding=”||||false|false” global_colors_info=”{}”][et_pb_row _builder_version=”4.24.3″ _module_preset=”default” custom_margin=”||||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][dsm_text_divider header=”Development” _builder_version=”4.24.3″ _module_preset=”default” header_level=”h1″ header_font=”|600||on|||||” global_colors_info=”{}”][\/dsm_text_divider][et_pb_text _builder_version=”4.24.3″ _module_preset=”default” text_font_size=”16px” text_orientation=”justified” global_colors_info=”{}”]<\/p>\n
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As part of your product development or to identify a candidate ingredient, we offer screening tests that enable you to assess UVB and UVA protection with ease.<\/p>\n<\/blockquote>\n
This test consists of evaluating the Critical Wavelength (CW), which expresses the ultraviolet A (UVA) protection in relation to the ultraviolet B (UVB) protection of a sun protection product over the entire UV spectrum, using a suitable substrate on which the product has been spread and measured using a spectrophotometric method.<\/p>\n
We can assess the sun protection of your products in full compliance with official methods, or claim the properties of your products through exclusive tests developed by WENEOS.<\/p>\n<\/blockquote>\n
ISO 24443:2021 specifies an in vitro procedure for characterizing the UVA protection of sunscreen products in a reproducible way. In order to determine the relevant UVA protection parameters, the method is strictly followed to provide a UV spectral absorbance curve from which a number of calculations can be made, such as the critical wavelength (CW). This method is based on the use of in vivo SPF results to scale the UV absorbance curve.<\/p>\n
ISO 23698:2024 proposes a hybrid approach combining in vitro and in vivo tests to assess the UV protection of sunscreens, in particular their Critical Wavelength (CW). It uses diffuse reflectance spectroscopy (DRS) to measure the absorbance of UVA (320-400 nm) on the skin. To obtain a complete UV absorbance spectrum, the in vitro absorbance values are adjusted according to the data obtained via DRS, enabling the in vitro UVB absorbance to be mathematically linked to the UVA portion measured by DRS. <\/p>\n
*Available from WENEOS from January 2025 (ref. HDRS-ISO)<\/p>\n
In June 2011, the US Food and Drug Administration (FDA) announced new requirements for sunscreens currently sold over-the-counter (OTC). Sunscreens that pass the FDA's in vitro critical wavelength test procedure, which measures a product's ultraviolet A (UVA) protection relative to its ultraviolet B (UVB) protection, can be labeled as %22broad spectrum%22 with an SPF value on the front label. This test is based on an in vitro spectrophotometric measurement technique involving UV exposure to a representative dose of ultraviolet radiation simulated by the sun, to take account of any photoinstability of the active ingredients contained in the sunscreen product.<\/p>\n
(ref. HeCW-FDA)<\/p>\n<\/p>\n
” _builder_version=”4.24.3″ _module_preset=”default” content_text_align=”justify” global_colors_info=”{}” parentOrderClass=”dsm_faq_4″][\/dsm_faq_child][dsm_faq_child dsm_title=”UVA:UVB ratio In Vitro – Boots Star Rating 2011″ dsm_content=”<\/p>\n
The UVA measurement method used to assign UVA:UVB ratio protection categories in accordance with the Boots Star Rating system (2011 revision) is based on an in vitro spectrophotometric measurement technique in which the product under test is spread using a suitable substrate and exposed to a representative dose of ultraviolet radiation simulated by the sun, to take account of any photoinstability of the active ingredients contained in the sunscreen product.<\/p>\n
To optimize your suncare products or check their quality, we offer you exclusive tests developed by WENEOS.<\/p>\n<\/blockquote>\n
[\/et_pb_text][dsm_faq _builder_version=”4.24.3″ _module_preset=”default” global_colors_info=”{}”][dsm_faq_child dsm_title=”Comparison of in vitro signal absorbance measurements (batch, aging, etc.)” dsm_content=”<\/p>\n
The statistical comparison method makes it possible to compare two sun protection products in terms of ageing, batch, benchmark, etc. When checking the absorbance spectrum between a reference and a test product using an in vitro method, two important rules must be observed. First of all, compare the two products at the same time and under the same conditions, to limit measurement variability. Secondly, a three-step verification based on absorbance values, including comparison of curve shape, variability and intensity.<\/p>\n
(ref. HeCOMP-1)<\/p>\n
Published method :<\/strong> <\/em>*In vitro comparison – A new accessible and reliable statistical method to compare the global UV protection properties of cosmetics – Lutz and S. Miksa, H&PC Sun Care, July\/August 2013 | *Sunscreen products: Some practical applications for a new comparison test method to help Development and ensure Quality Controls – D. Lutz, S. Miksa and C. Guy, H&PC Today, November\/December 2014<\/em><\/p>\n
Critical Wavelength - <\/span>UVA:UVB ratio<\/span><\/h1>\n\t\t\t\t<\/div>\n\t\t\t<\/div>Sun protection products should be sufficiently effective against UVB and UVA rays to ensure a high level of public health protection. UVA and UVB protection therefore need to be linked in order to optimize product development and comply with regulatory requirements. WENEOS is dedicated with expertise and passion to guiding its customers in submitting reliable data to regulatory authorities. To this end, to ensure broader protection, regulations recommend a critical wavelength of at least 370 nm, or a minimum UVA:UVB ratio. The critical wavelength is expressed as the wavelength at which the integral of the absorption spectrum curve starting at 290 nm reaches 90% of the integral between 290 and 400 nm. The UVA:UVB ratio is expressed as the ratio between the integral of the absorption spectrum curve in UVA (between 320 nm and 400 nm) and in UVB (between 290 nm and 320 nm).
<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>As part of your product development or to identify a candidate ingredient, we offer screening tests that enable you to assess UVB and […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":10184,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"class_list":["post-10213","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/weneos.com\/en\/wp-json\/wp\/v2\/pages\/10213","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/weneos.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/weneos.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/weneos.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/weneos.com\/en\/wp-json\/wp\/v2\/comments?post=10213"}],"version-history":[{"count":7,"href":"https:\/\/weneos.com\/en\/wp-json\/wp\/v2\/pages\/10213\/revisions"}],"predecessor-version":[{"id":13358,"href":"https:\/\/weneos.com\/en\/wp-json\/wp\/v2\/pages\/10213\/revisions\/13358"}],"up":[{"embeddable":true,"href":"https:\/\/weneos.com\/en\/wp-json\/wp\/v2\/pages\/10184"}],"wp:attachment":[{"href":"https:\/\/weneos.com\/en\/wp-json\/wp\/v2\/media?parent=10213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}