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    AI Overview
    SLES (Sodium Laureth Sulfate) is typically adjusted to a pH of 5.0–7.0 for optimal stability and skin compatibility, often using citric acid to lower pH or sodium hydroxide to raise it. As a neutral or slightly alkaline chemical (
    10
    %
     solution is
    ∼7.5tilde 7.5
    ∼7.5
    ), balancing pH is critical to prevent degradation (hydrolysis) of the sulfate group. 
    This video demonstrates the process of pH adjustment:
    Related video thumbnail
    45s
    Trish Hartzell
    YouTube• Aug 20, 2015
    Key Aspects of SLES pH Adjustment 
    • Optimal pH Range: While SLES can function in a broad range, it is most stable between 4.0 and 6.5. Final personal care formulations (shampoos, soaps) are usually set at pH 5.0–7.0.
    • Adjustment Agents:
      • Acidification: Citric Acid is commonly used to reduce the pH to acidic levels (e.g., for formulas requiring pH 5.0-5.5).
      • Alkalizing: Sodium Hydroxide (NaOH) is used during production to convert acid groups to their salt form and to raise the pH if necessary.
    • Stability Concerns: Improper pH, especially long-term exposure to high acidity (pH < 4), can cause hydrolysis, reducing the effectiveness of the surfactant.
    • Concentration Effects: The pH is usually checked and adjusted in a 10% solution of the product.
    • Equipment: Industrial production uses specialized pH adjustment tanks with agitators to monitor and maintain pH, along with other parameters like viscosity and dioxane levels. 
    • Unit 15 pH Adjustment
      The pH adjustment unit is to stabilize the pH value, homogenize the product and fine-tune the specifications when producing SLES a...
      WEIXIAN (Nanjing) Science Technology co., ltd
    • SLES in Liquid Detergents - green agrochem
      May 8, 2025 — Cocamide DEA/MEA: Improves foam and viscosity but is less common due to potential nitrosamine concerns. Thickening: Sodium chlorid...
      green agrochem
    • SLES in Personal Care Formulations - INTERSURFCHEM
      May 14, 2025 — pH Adjustment. SLES formulations typically require a pH range of 5-7 to ensure stability and skin compatibility. Citric acid or so...
      www.polymerchem.org
    • Preservative Selection for Sodium Laureth Sulfate (SLES ...
      Apr 15, 2026 — Answer. For a shampoo formulated with Sodium Laureth Sulfate (SLES), you need a broad-spectrum preservative that is stable in the ...
      MySkinRecipes
    • How to make SLES?. How to convert SLS to SLES? SLES ...
      Jun 27, 2023 — SLES product, sodium hydroxide (NaOH) is added gradually to adjust the pH and convert the acid groups into their sodium salt forms...
      4:42
      YouTube·Dr Samiran Chakraborty
    • SLES: 10 Facts I Need To Know - Camachem
      Aug 22, 2025 — PH Level. Sodium Laureth Sulfate is an anionic surfactant. 10% solution of it has been discovered to have a pH value of 7.5. This ...
      Camachem
    • Formulating with SLES: Tips for Using Sodium Laureth Sulfate ...
      Secondly, consider pH compatibility. SLES performs well across a range of pH values, but it is most stable in formulations with a ...
      NINGBO INNO PHARMCHEM CO.,LTD.
    • Unit 15 pH Adjustment
      The pH adjustment unit is to stabilize the pH value, homogenize the product and fine-tune the specifications when producing SLES a...
      WEIXIAN (Nanjing) Science Technology co., ltd
    • SLES in Liquid Detergents - green agrochem
      May 8, 2025 — Cocamide DEA/MEA: Improves foam and viscosity but is less common due to potential nitrosamine concerns. Thickening: Sodium chlorid...
      green agrochem
    • SLES in Personal Care Formulations - INTERSURFCHEM
      May 14, 2025 — pH Adjustment. SLES formulations typically require a pH range of 5-7 to ensure stability and skin compatibility. Citric acid or so...
      www.polymerchem.org
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    Videos
    WEIXIAN designed Sulphonation Process: Unit 15 SLES/SLS ...
    YouTube · WEIXIAN NANJING SCIENCE TECHNOLOGY CO.,LTD
    Jul 18, 2024
    YouTube · WEIXIAN NANJING SCIENCE TECHNOLOGY CO.,LTD
    1:14
    WEIXIAN NANJING SCIENCE TECHNOLOGY CO.,LTD
    YouTube·
    Jul 18, 2024

    WEIXIAN designed Sulphonation Process: Unit 15 SLES/SLS ...

    YouTube·WEIXIAN NANJING SCIENCE TECHNOLOGY CO.,LTD·Jul 18, 2024
    YouTube
    How to make SLES?. How to convert SLS to SLES? SLES ...
    YouTube · Dr Samiran Chakraborty
    Jun 27, 2023
    YouTube · Dr Samiran Chakraborty
    4:42
    Dr Samiran Chakraborty
    YouTube·
    Jun 27, 2023

    How to make SLES?. How to convert SLS to SLES? SLES ...

    YouTube·Dr Samiran Chakraborty·Jun 27, 2023
    YouTube
    PH balance || what is ph adjustment for cleaning products
    YouTube · Chemical Sirji
    Sep 20, 2022
    YouTube · Chemical Sirji
    10:03
    Chemical Sirji
    YouTube·
    Sep 20, 2022

    PH balance || what is ph adjustment for cleaning products

    YouTube·Chemical Sirji·Sep 20, 2022
    YouTube
    View all
    People also ask
    What is the pH stability of SLES?
    Stable in acidic to neutral pH ranges (5.5–7.5 for skin contact). Compatible with most anionic, nonionic, and amphoteric surfactants.

    Sodium Lauryl Ether Sulfate (SLES) - LONGKEY


    LONGKEY
    https://www.longkey.com › products › sodium-lauryl-eth...
    LONGKEY
    https://www.longkey.com › products › sodium-lauryl-eth...
    What solution is used for pH adjustment?
    pH Adjusters to Change the pH Value

    We offer commonly used pH adjustment chemicals including citric acid, hydrochloric acid, acetic acid and sodium hydroxide.

    pH Adjustment and Buffers - Sigma-Aldrich


    Sigma-Aldrich
    https://www.sigmaaldrich.com › buffers-and-ph-adjusters
    Sigma-Aldrich
    https://www.sigmaaldrich.com › buffers-and-ph-adjusters
    What is the ratio of SLES to water?
    This dilutable formulation is a sodium laureth sulfate (SLES)-based, concentrated shower gel. Dilute the formulation with tap water at a 1:3 ratio. Using 100 mL of concentrate will create a 400 mL shower gel.

    SLES-Based Concentrated Shower Gel - Stepan


    Stepan
    https://www.stepan.com › products-markets › formulary
    Stepan
    https://www.stepan.com › products-markets › formulary
    How much sodium hydroxide to increase pH?
    Sodium hydroxide is used to raise pH and to convert excess carbon dioxide to alkaline species. Typical concentrations used are 2–100 mg/L (as caustic soda), but higher concentrations may be required with waters of poor quality.

    Sodium hydroxide | Australian Drinking Water Guidelines - NHMRC


    Australian Drinking Water Guidelines - NHMRC
    https://guidelines.nhmrc.gov.au › treatment-chemicals › s...
    Australian Drinking Water Guidelines - NHMRC
    https://guidelines.nhmrc.gov.au › treatment-chemicals › s...

    Web results

    Unit 15 pH Adjustment


    WEIXIAN (Nanjing) Science Technology co., ltd
    https://www.njweixian.com › unit-15-sles-ph-adjusting_3...
    WEIXIAN (Nanjing) Science Technology co., ltd
    https://www.njweixian.com › unit-15-sles-ph-adjusting_3...
    The pH adjustment unit is to stabilize the pH value, homogenize the product and fine-tune the specifications when producing SLES and SLS.Read more

    Improving SLES dilution consistency for a cosmetics ...


    Tapflo
    https://tapflo.com › Home page › Case Studies
    Tapflo
    https://tapflo.com › Home page › Case Studies
    Apr 11, 2025 — pH control: the addition of a pH controller enabled real-time monitoring and adjustment of pH levels, ensuring product stability and shelf life.Read more

    Tips for Using Sodium Laureth Sulfate Effectively


    NINGBO INNO PHARMCHEM CO.,LTD.
    https://www.nbinno.com › ... › Sodium Laureth Sulfate
    NINGBO INNO PHARMCHEM CO.,LTD.
    https://www.nbinno.com › ... › Sodium Laureth Sulfate
    Secondly, consider pH compatibility. SLES performs well across a range of pH values, but it is most stable in formulations with a pH between 4.0 and 6.5.Read more

    SLES in Personal Care Formulations - INTERSURFCHEM


    polymerchem.org
    https://www.polymerchem.org › sles-in-personal-care-f...
    polymerchem.org
    https://www.polymerchem.org › sles-in-personal-care-f...
    May 14, 2025 — SLES formulations typically require a pH range of 5-7 to ensure stability and skin compatibility. Citric acid or sodium hydroxide may be used to ...Read more

    SLES in Liquid Detergents


    green agrochem
    https://www.greenagrochem.com › sles-in-liquid-deterg...
    green agrochem
    https://www.greenagrochem.com › sles-in-liquid-deterg...
    May 8, 2025 — pH Adjustment: Liquid detergents with SLES are typically formulated at pH 7–9 to optimize stability and minimize skin irritation. Citric ...Read more

    Study on acidic degradation of SLES and its impact on ...


    IISER Pune
    http://dr.iiserpune.ac.in › xmlui › bitstream › handle
    IISER Pune
    http://dr.iiserpune.ac.in › xmlui › bitstream › handle
    PDF
    by P PRASANTHAN · 2015 — Fig 10 Percentage of 20% SLES 1EO hydrolyzed with time at initial pH of 2 and 3, (pH adjusted using HCl) at T=800C. 3.3 Hydrolysis kinetics of SLES 2EO in a p.Read more

    Sulfate Content Titration in SLES | PDF | Chemistry


    Scribd
    https://www.scribd.com › document › Mettler-Sulfato
    Scribd
    https://www.scribd.com › document › Mettler-Sulfato
    Key steps include dissolving the SLES sample in water and ethanol, adjusting the pH to 3, and titrating with lead nitrate solution. Lead sulfate precipitates ...Read more

    Preservative Selection for Sodium Laureth Sulfate (SLES) ...


    MySkinRecipes
    https://www.myskinrecipes.com › Home › Browse Q&A
    MySkinRecipes
    https://www.myskinrecipes.com › Home › Browse Q&A
    Apr 15, 2026 — pH Control: Most preservatives are pH-dependent. Ensure your shampoo's final pH is adjusted (usually with Citric Acid) to the range required by ...Read more
    1 answer  ·  Top answer: For a shampoo formulated with Sodium Laureth Sulfate (SLES), you need a broad-spectrum preservative that is stable in the presence of anionic surfactants ...

    SLES: 10 Facts I Need To Know


    Camachem
    https://camachem.com › blog › SLES-Facts-I-Need-To-K...
    Camachem
    https://camachem.com › blog › SLES-Facts-I-Need-To-K...
    PH Level. Sodium Laureth Sulfate is an anionic surfactant. 10% solution of it has been discovered to have a pH value of 7.5. This shows that the chemical is ...Read more
    Missing: adjustment ‎| Show results with: adjustment
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