BUTTER-C
Body care
Bath salt OEM/ODM manufacturing
Bath Salt · Salt Body Scrub · OEM/ODM
Bath salt comes in two forms that Vietnamese consumers call by the same name. The first is soaking salt: salt grains infused with essential oils and dried flowers, added to a bathtub or foot basin for relaxation. The second, more popular in the domestic market, is salt scrub: salt grains mixed with milk, herbs or nourishing oils, massaged onto damp skin and rinsed off for smoother skin after the shower. Both are dry or nearly dry, so the technical challenge lies not in an emulsion but in the salt grain: even grains, no caking in humid weather, a scent that does not fade, oil that does not separate, and grains soft enough not to scratch the skin. Butter-C offers turnkey OEM/ODM manufacturing, from formula development to labeled finished goods and the notification dossier.
Formula base
Salt grains, nourishing ingredients and fragrance
The type of salt and grain size determine how the product feels in use; the nourishing ingredients and fragrance determine its positioning.
Base salt
Refined sea salt, pink salt and Epsom salt (magnesium sulfate) for soaking salts; fine to medium sea salt for salt scrubs.
Foaming and water-softening agents
Sodium bicarbonate softens bath water for a silky feel; a small amount of mild surfactant helps salt scrubs rinse off easily with a light lather.
Nourishing ingredients
Milk, hydrolyzed milk protein, tamarind, turmeric, rice bran and plant oils build the product story and replenish moisture after the salt massage.
Fragrance and color
Essential oils, fragrances, dried flowers and colorants permitted for skin-contact products; fragrance level is set according to how well the salt holds scent.
Key technical points
Four factors that decide bath salt quality
No caking
Salt absorbs moisture very readily in humid weather. It is dried to the required moisture level, anti-caking agents are added when needed, and packing takes place in a dry room with moisture-barrier packaging.
Grain size and softness
Grains that are too large or sharp-edged can scratch skin; grains that are too fine dissolve on contact with water. Salt is sieved to the agreed grain size and checked for uniformity batch by batch.
Lasting scent
Fragrance is evenly loaded onto the grain surface using a type that holds up in salt; airtight packaging keeps the scent from fading after a few months on the shelf.
No oil separation
In paste-type salt scrubs, oil tends to rise to the top. The ratios of oil, oil-phase thickener and emulsifier are adjusted so the mixture stays uniform throughout the shelf life.
Three formulation directions
Three common bath salt formats
Relaxing soaking salt
Sea salt or Epsom salt infused with essential oils, with dried flowers; added to a bathtub or foot basin. Suits spas and gifting.
Dry salt scrub
Fine salt mixed with milk powder and herbal powders; users mix it with water or shower gel at the time of use. Affordable and easy to store.
Paste salt scrub
Salt pre-mixed in an oil base or rinse-off cream base; ready to use, with a noticeably nourishing feel and no dryness after rinsing.
Packaging designed with the formula
Screw-cap jars with a scoop, stand-up zipper pouches, glass jars. Packaging needs a good moisture barrier; salt can rust metal caps.
Parameters we monitor
What our R&D lab measures on every sample
These are the parameters Butter-C monitors during formula development and scale-up to production. Specific limits are agreed with you on the approved sample and then written into the product's in-house specification.
- Moisture content
- Measured on the base salt and on finished goods; the deciding parameter for caking.
- Particle size distribution
- Sieved through the agreed mesh sizes; fines and oversized grains are checked.
- Appearance
- Color, odor and uniformity of dried flowers and added ingredients, compared with the approved sample.
- Oil separation (paste type)
- Standing, centrifuge and 40°C tests; monitored for a floating oil layer and uniformity.
- Microbiology
- Tested at a GLP / ISO 17025-accredited laboratory, especially when milk and herbal powders are included.
- Heavy metals
- Mineral salts, pink salt and herbal powders are sources to control; checked against supplier certificates of analysis and tested on finished goods.
- Fragrance stability
- Scent assessed after accelerated aging and after repeated opening for use.
- Packaging compatibility
- Monitored for cap rust, oil seepage through packaging and moisture ingress through zippers.
Claims
Writing claims within cosmetic scope
Bath salts often come with promises that belong to the language of medical products (see the "Instead of" examples below). Butter-C reviews the wording on labels and marketing materials while preparing the notification dossier.
Removes dead skin cells for smoother skin
Instead of: regenerates skin, peels skin, treats folliculitis.
Provides a relaxing feeling while soaking
Instead of: relieves muscle aches, relieves joint pain, cures insomnia.
Skin looks brighter and smoother after bathing
Instead of: whitening bath, instant skin whitening.
Cleanses the skin on the back and chest
Instead of: treats back acne, treats dark spots.
Soothing, relaxing scent
Instead of: detoxifies, purifies the body.
Directions for use
State clearly not to massage onto broken skin, the face or sensitive areas.
Manufacturing specifications
Current capabilities
- Texture
- Dry salt grains, salt blended with powders, salt in an oil or cream base.
- Pack formats
- Screw-cap jars, stand-up zipper pouches, glass jars, single-use sachets. Fill weight agreed when packaging is selected.
- Minimum order quantity
- Agreed per order and per fragrance.
- Testing
- Performed at a GLP / ISO 17025-accredited laboratory, with a certificate of analysis delivered with every batch.
- Documentation
- Product Information File (PIF) and notification dossier prepared by Butter-C.
- Packaging
- Label design, printing and packing run in parallel with formula development.
Suggested product concept
Milk and tamarind salt body scrub
A product concept to help you picture the possibilities, not a ready-made product for sale. The actual formula is developed around your brand's positioning and price range.
Medium-grain sea salt
Rounded grains, textured enough to remove dead skin cells without scratching; dissolves gradually when massaged on damp skin.
Milk and tamarind
Two ingredients familiar from traditional Vietnamese skin care, for a relatable story.
Light lather, easy rinse
A small amount of mild surfactant keeps salt from clinging to skin after rinsing.
300 g jar with scoop
Moisture-proof screw-cap jar with a scoop so no water gets into the jar when taking salt out.
Customization options
What you can specify
Within the same product type, each brand targets a different customer group. Tell us your requirements in the areas below, and our team of pharmacists will develop a matching formula.
Product format
Soaking salt, dry salt scrub or paste salt scrub.
Salt type and grain size
Sea salt, pink salt, Epsom salt; fine, medium or coarse grain.
Featured ingredients
Milk, tamarind, turmeric, rice bran, coffee, green tea, rose, lavender.
Fragrance
Natural essential oils, fragrance or unscented; you can provide a reference scent sample.
Color and dried flowers
The salt's natural color, permitted colorants, or blended dried petals.
Pack format
Family-size jars, refill pouches, single-use sachets for spas and hotels.
Further reading
Related topics
Facial exfoliator OEM/ODM manufacturing
The principles of physical and acid exfoliation.
Shower gel OEM/ODM manufacturing
A companion to salt scrub in a body care set.
Cosmetic labeling rules
How to state net weight, directions and warnings (in Vietnamese).
Raw material quality management
Controlling incoming mineral salts and herbal powders (in Vietnamese).
How we work
From idea to finished batch
Eight steps and three milestones signed off by both sides: approved sample, notification number, finished batch. Step-by-step details (in Vietnamese) →
Get started
Tell us about the product you plan to launch
Send us your product direction and expected volume. Our team will get back to you during business hours (Vietnam time, GMT+7).
Head office: Huu Le village, Dai Thanh commune, Hanoi · Factory: Thanh Oai Industrial Cluster, Binh Minh commune, Hanoi, Vietnam
Hotline +84 987 964 764 · [email protected] · Privacy policy ← Full catalog