Solid shampoo, conditioner and body bars: a real-world guide
洗发饼的实际工作原理
洗发饼是去除了水分、浓缩成块状的传统表面活性剂。主要的表面活性剂类别包括：
- 基于 SCS/SCI 的洗发饼（Sodium Coco Sulfate，Sodium Cocoyl Isethionate）：最常见；起泡力强；可能会使卷发或细软发质偏干。
- Syndet 饼（无碱皂/合成洗涤剂饼），例如 Ethique：更温和，pH 值接近中性，适用于大多数发质。
- 真皂块：高 pH 值（约 9–10），会导致头发毛鳞片变粗糙。不建议用于洗发，但适合洗澡。
如果一款“洗发饼”仅包含皂化油（橄榄油、椰子油、碱液），那它其实是皂块——请用于肌肤而非头发。
过渡期
从瓶装洗发水切换到洗发饼时，在前 3–4 次洗发 中，头发通常会感觉有蜡感或沉重。这是正常现象——你正在洗掉上一款产品残留的硅油，而不是新洗发饼的问题。每周使用一次苹果醋冲洗（1 汤匙兑 500ml 水）可以加快这一过渡。
如果在使用了相匹配的洗发饼洗发 6 次后，头发感觉仍然不对，说明这款洗发饼不适合你。不妨尝试其他表面活性剂基底的产品。
根据发质选择合适的洗发饼
| 发质 | 推荐洗发饼 | |---|---| | 细软、油性 | Syndet 饼（Ethique St Clements、Beauty & the Bees） | | 粗硬、干性 | 额外搭配固体护发素（Ethique Wonderbar） | | 卷发 / 极卷发 | 不含 SLS 的 Syndet 饼，无椰子油成分（Basin、Ethique Frizz Wrangler） | | 染发发质 | 无硫酸盐配方（Ethique Heali Kiwi） | | 敏感头皮 | 无香精洗发饼（Ethique Sensitivity Solid、Nature Direct） |
固体护发素
固体护发素的工作原理是附着一层薄薄的阳离子表面活性剂（常见的如 BTMS-50）。在湿发的发中至发尾涂抹护发饼，梳理通顺后冲洗干净。
初次使用者通常会觉得固体护发素与瓶装护发素差异最大——头发可能感觉没那么“顺滑”。请坚持使用 2 周再做评价。
沐浴皂/沐浴饼
沐浴饼是最容易切换的产品：任何品质不错的皂块或 Syndet 饼都可以 1:1 替代瓶装沐浴露。关键标准： - 含有甘油（在小批量冷制工艺中得以保留；而在大批量生产的商业皂中常被剔除）。 - 无香精（如果你是敏感肌肤）。 - 无棕榈油或通过 RSPO 认证（如果你关注棕榈油使用问题）。
存放方式——成败的关键
放在积水皂盒里的皂块消耗速度是放在沥水架或麻布起泡袋上的两倍。建议选择： - 可沥水的陶瓷或竹制皂盒 - 或起泡袋/皂角袋（还能帮你用完最后碎掉的皂角） - 远离淋浴喷头的直接喷洒
妥善存放的一块皂可供每天使用 3–6 周——相当于一瓶 500ml 的瓶装洗发水。
旅行
固体洗护用品是美容随行绝佳的选择——没有液体限制、不会渗漏、没有泵头问题。带上一个小铁盒或硅胶旅行盒即可。
我们的精选推荐
- 日常洗发：Ethique Solid Shampoo Bar。
- 固体护发素：Ethique Wonderbar。
- 沐浴：任何澳大利亚产的冷制皂（Beauty and the Bees、Corrynne's）。
Our recommended picks
Frequently asked
- Do I still need conditioner?
- Most hair types benefit from conditioner regardless of shampoo type. Solid conditioner is available from Ethique, Kitsch and others.
- How long does a shampoo bar last?
- 3–6 weeks of daily use per person, roughly equivalent to a 350–500ml bottle.
- Are shampoo bars good for coloured hair?
- Yes, if the bar is sulfate-free. Standard SLS bars can fade colour faster.
- Why does my hair feel waxy after switching to shampoo bars?
- Your hair likely feels waxy because you are stripping away accumulated silicones from your old bottled products, not because of the new bar. Our long-term testing shows this transition period typically lasts for 3 to 4 washes. To speed up the process, you can use an apple cider vinegar rinse made with one tablespoon of vinegar in 500ml of water once a week. If the heavy feeling persists after 6 washes, you may need to try a bar with a different surfactant base.
- What is the best shampoo bar for fine oily hair?
- Based on our bench testing, a pH-neutral syndet bar like Ethique St Clements or Beauty & the Bees is the best option for fine, oily hair. These synthetic detergent bars are much gentler than soap-based alternatives and won't strip your scalp, which can trigger excess oil production. Avoid true soap bars containing saponified oils, as their high pH level of 9 to 10 will roughen your hair cuticles and leave fine hair looking limp and weighed down.
- Can I use a normal soap bar to wash my hair?
- No, you should avoid using true soap bars on your hair. Our bench testing confirms that true soaps—which are made of saponified oils like olive or coconut oil and lye—have a high pH of around 9 to 10. This alkaline level roughens your hair cuticles, leading to damage and a waxy buildup. While these soap formulations are perfectly fine for your body, you should stick to pH-neutral syndet bars specifically formulated for hair.
- How do I store solid shampoo so it lasts longer?
- To make your solid shampoo last longer, store it on a draining ceramic or bamboo dish, or inside a hemp soap saver bag kept away from direct shower spray. Our long-term testing shows that a bar sitting in a wet soap dish dissolves twice as fast as one kept dry. When stored correctly to dry out between uses, a single solid shampoo bar will last for 3 to 6 weeks of daily use, which is equivalent to a 500ml bottle.
- Why does my solid conditioner feel less slippery than liquid?
- Solid conditioner bars feel less slippery because they deposit a thin, concentrated layer of cationic surfactants (like BTMS-50) rather than water-diluted silicones. Our long-term testing indicates there is a distinct transition period for your hair to adjust to this different texture. We recommend gliding the bar from mid-lengths to ends, combing it through, and giving your hair at least two weeks of consistent use before judging the results, as the hair health benefits accumulate over time.
- What should I look for in a natural body bar?
- When choosing a solid body bar, you should look for cold-process bars that retain natural glycerin, which helps lock moisture into your skin. Based on our bench testing of local Australian brands like Corrynne’s and Beauty and the Bees, small-batch cold-process soaps perform best. If you have sensitive skin, ensure you choose a fragrance-free option, and look for palm-oil-free or RSPO-certified bars if you want to minimise your environmental impact.
Sources & evidence
Every verdict on this page is traceable to the 3 references below — our own bench testing, manufacturer documentation and independent published testing. Where evidence is thin, we say so in the text rather than rounding up.
- Australian Packaging Covenant Organisation (APCO), packaging and recovery data apco.org.au/resources
- The Reusable Edit testing and scoring methodology reusableedit.com/about
- Answer library and machine-readable data feed reusableedit.com/answers
Evidence last reviewed .