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Shamp👀 · Deep Dive · Product Safety · 公開 2026-05-01 Updated 2026-05-01

Perm & Relaxer Chemical Safety: Sodium Hydroxide Handling — Deep Dive

要約

In-depth analysis of sodium hydroxide handling within perm & relaxer chemical safety for salons.

📑 目次
  1. 1. Context
  2. 2. Common pitfalls
  3. 3. Authority-recommended solutions
  4. 4. Operator dialogue
    1. 🦉 & 🐥 & 🐮 — Salon operator dialogue
  5. 5. KPI targets
  6. Primary sources (national & international authorities)
    1. Related Articles
    2. サロンの衛生記録を自動化しませんか？
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1. Context

Permanent-wave and relaxer solutions use strong reducing or alkaline agents to break and reform disulfide bonds in hair keratin[1]. Thioglycolate perms (pH 9-9.6), sodium hydroxide relaxers (pH 12-14), and ammonium bisulfite alternatives each carry distinct hazard profiles. In any country, the cosmetics safety regulator sets concentration limits and requires GHS-compliant labelling[2].

This deep dive focuses on sodium hydroxide handling — one of the most critical sub-areas within perm & relaxer chemical safety.

2. Common pitfalls

  1. General challenge
  1. General solution
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4. Operator dialogue

🦉 & 🐥 & 🐮 — Salon operator dialogue

🐥
Piyo: Poppo, are perm chemicals really that dangerous?
🦉
Poppo: Thioglycolate in perm solution is a strong reducing agent. Skin contact causes irritation, prolonged exposure can cause sensitisation, and ingestion is a medical emergency. The neutraliser (hydrogen peroxide) is an oxidiser. These are serious chemicals that happen to be used in a beauty context.
🐥
Piyo: What's the number one mistake salons make with perms?
🦉
Poppo: Not setting a timer. Over-processing isn't just bad for the hair — it means prolonged chemical exposure for both client and stylist. The SDS specifies exact processing times for a reason.
🐮
Mou: Strong, kind, beautiful — a beautiful perm starts with respecting the chemistry that makes it possible.

5. KPI targets

IndicatorBaselineTargetTimeMeasurement
Pre-service sensitivity screeningVariable100%ImmediateConsultation card
Processing time accuracyVariable100% per SDS timer1 weekTimer log
Neutraliser stock expiry checkMonthlyWeekly2 weeksStock audit
Ventilation compliance during permVariable100%1 weekVentilation log
Adverse reaction rateVariable0/quarter3 monthsIncident log

Primary sources (national & international authorities)

  1. WHO Guidelines on Hand Hygiene in Health Care (2009). https://www.who.int/publications/i/item/9789241597906
  2. EU Regulation (EC) No 1223/2009 on cosmetic products. https://eur-lex.europa.eu/eli/reg/2009/1223/oj
  3. FDA Modernization of Cosmetics Regulation Act (MoCRA, 2022). https://www.fda.gov/cosmetics/cosmetics-laws-regulations/modernization-cosmetics-regulation-act-2022-mocra
  4. Cosmetic Ingredient Review (CIR) — 4,740+ ingredient assessments. https://www.cir-safety.org/ingredients

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重要な免責事項： MmowWは美容衛生認証機関ではありません。上記の内容は、各国当局の一次ソース（WHO・FDA・EU規則1223/2009・各国衛生当局）から抽出した教育目的のベストプラクティス情報です。最終責任はサロン事業者および所轄当局にあります。常に一次ソースおよびお住まいの規制当局でご確認ください。
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澤井 隆行 — 行政書士

行政書士・MmowW創業者。世界中のサロン衛生コンプライアンスを極楽にする。

安全で、愛される。