CAS 103597-45-1 ·
No specific rule on file.
Approved UV filter Annex VI/23a
Maximum: 10 %(*) (*) In case of combined use of Methylene Bis-Benzotriazolyl Tetramethylbutylphenol and Methylene Bis-Benzotriazolyl Tetramethylbutylphenol (nano), the sum shall not exceed the limit given in column g.’.
Conditions: Not to be used in applications that may lead to exposure of the end user's lungs by inhalation. Only nanomaterials having the following characteristics are allowed: — Purity ≥ 98,5 %, with 2,2′-methylene-bis- (6(2H-benzotriazol-2-yl)-4-(isooctyl)phenol) isomer fraction not exceeding 1,5 %; — Solubility < 5 ng/L in water at 25 °C; — Partition coefficient (Log Pow): 12,7 at 25 °C; — Uncoated; — Median particle size D50 (50 % of the number below this diameter): ≥ 120 nm of mass distribution and/or ≥ 60 nm of number size distribution.
Source: EU CosIng — Annex VI · checked Oct 17, 2026
Not an FDA-listed sunscreen active M020 (not listed)
Conditions: Permitted as a UV filter elsewhere, but not on the FDA list of sunscreen active ingredients (§M020.10). It cannot be the active ingredient of a sunscreen marketed in the U.S. under the monograph.
Source: FDA OTC Monograph M020 (sunscreens) · checked Oct 17, 2026
This is a UV filter. In the U.S., sunscreens are regulated as over-the-counter drugs, so a filter must be on the FDA's list of permitted sunscreen actives to be used in a sunscreen sold there. Compare all filters on Sunscreen filters: Korea vs EU vs U.S.
METHYLENE BIS-BENZOTRIAZOLYL TETRAMETHYLBUTYLPHENOL (NANO)
Information only, not medical advice. Rules change — always check the linked official source. If you are pregnant, have a skin condition or allergies, ask a dermatologist or pharmacist.
In the EU's CosIng records it is listed as “Approved UV filter” (EU CosIng — Annex VI). The maximum allowed is 10 %. It is allowed for that use within the stated conditions.
We found no specific rule for it in Korea's MFDS records. That is not an approval or a safety statement.
In the FDA's records it is listed as “Not an FDA-listed sunscreen active” (FDA OTC Monograph M020 (sunscreens)).
2 products we checked list it, for example Ksecret SEOUL 1988 Sun : Pine Tree + Ceramide, IOPE UV Shield Sun Protector 50ML.
CAS 103597-45-1 (from official records).