Waterless and solid skincare — balms, solid cleansing bars, powders and oil-based serums — contains little or no free water, so microbes struggle to grow. But "waterless" does not mean "risk-free": once water from wet hands or a shower reaches the product, contamination can begin. Indie brands in NZ and Australia still need water activity checks, microbial testing and the right packaging before launch.
At The INCI Lab we're seeing more founders ask for solid and waterless formats — driven by lighter shipping, less packaging and a clean-beauty story. It's a great category for small brands. It just needs the same science as any other product, applied differently.
What counts as a waterless or anhydrous cosmetic?
An anhydrous product is made without a water phase. Typical examples are body butters, lip and healing balms, oil-based serums, cleansing balms, solid shampoo and conditioner bars, solid perfumes, and powder cleansers or masks. Because they contain little free water, their water activity is usually very low — often below 0.6, a level at which most bacteria, yeast and mould cannot multiply.
Do waterless products need a preservative?
Sometimes not in the container — but it depends on how the product is used. A balm that stays dry in a tin has a very low microbial risk. A solid shampoo bar, cleansing balm or powder cleanser is different: it meets water every time it is used, and it often sits in a damp bathroom between uses. Raw materials matter too. Botanical powders, clays and plant extracts can carry microbial spores, so ingredient microbial limit testing is part of the plan, not an optional extra.
The practical approach is to decide product by product. We assess whether the formula needs a protective system, measure water activity on the finished product, and use preservative efficacy testing where in-use water exposure makes it appropriate. Preservative efficacy testing is NZ$1,200 per formula.
What are the formulation challenges with solid formats?
Solid products trade one set of problems for another. Common ones include:
- Texture and melt point: balms and bars that are perfect in Auckland winter can soften or sweat in an Australian summer or a courier van. Wax and butter ratios need testing at realistic temperatures.
- Mildness: solid cleansing bars need gentle surfactants so they clean without stripping — soap-free, low-pH bars are a specialist formulation job.
- Oxidation: oil-rich products can go rancid, so antioxidant choice and shelf-life data matter.
- Cracking, blooming and sweating: butters can grain or bloom, and bars can crack or turn mushy in use.
These issues are exactly what stability testing is designed to surface before your customers do.
Is waterless skincare really more sustainable and cheaper to ship?
Often, yes — with caveats. Removing water means a concentrated product, lighter freight and the option of plastic-free packaging such as tins, paper tubes or glass. But sustainability claims need care: a bar packaged in a poorly matched container can fail in the field, and vague "eco" wording can breach claims rules. Have your claims checked against our guide to what you can legally claim in NZ and Australia, and confirm packaging suitability early (see packaging compatibility testing).
Can I make a small batch of solid or waterless products?
Yes, and it's one of the friendliest formats for small runs. Our MOQs sit at 100–500 units depending on your pathway. Pre-formulated, stability-tested bases in our Ready-to-Go range are the fastest route. If you want a signature balm or bar, The Accelerator (semi-custom, 4–6 months, starting from NZ$2,000–$5,000) or The Visionary (bespoke, 9–12 months, from NZ$4,000) give you a formula you can own — The Visionary includes full IP transfer before manufacturing. We can formulate vegan, cruelty-free and fragrance-free versions, and prepare documentation for NZ, Australia (including AICIS requirements for ingredients), the EU and the US.
How do I get started?
Start with the format you want and the story you want to tell, then let the chemistry follow. If you're not sure whether a bar, balm or powder suits your brand, book an Ask The Chemist session (30 minutes, NZ$150), or explore our services to choose a pathway.
Frequently asked questions
Is anhydrous the same as waterless?
Broadly, yes. Anhydrous means formulated without a water phase. Some products marketed as waterless still contain small amounts of water from ingredients such as extracts, so it's worth checking the INCI list and measuring water activity.
Do solid shampoo bars need preservatives?
Not always, but they are exposed to water during use and stored damp, so risk needs to be assessed. We test the finished product and recommend preservative efficacy testing where appropriate.
What is water activity and why does it matter?
Water activity measures how much water in a product is available to microbes, on a scale from 0 to 1. Low values, commonly below 0.6, strongly limit microbial growth.
Can waterless products be certified organic or vegan?
Yes, provided every ingredient meets the standard you're targeting. Waxes are a common trap — beeswax isn't vegan, so we'd use plant-based alternatives for vegan claims.
What's the minimum order for a solid skincare product?
MOQs are typically 100–500 units depending on the pathway and format.
Does a waterless product still need stability testing?
Yes. Heat, cracking, oxidation and texture changes are the main risks, and they only show up under proper testing.
Ready to explore a waterless range? Get in touch and we'll map the right pathway for your brand.