✦ High-purity cationic conditioning emulsifier with approximately 85% active Behentrimonium Methosulfate, requiring lower use levels than standard BTMS 50.
✦ Delivers exceptional detangling, cuticle smoothing, and frizz reduction in rinse-off and leave-in haircare formulations.
✦ Functions simultaneously as a conditioning agent and primary emulsifier, simplifying formula design and reducing overall ingredient count.
✦ Compatible with silicones, fatty alcohols, cationic conditioning polymers, and nonionic emulsifiers for advanced formulation stacking.
✦ Effective in creams, body lotions, and hair masks at use levels as low as 1.5 to 3%, producing stable, elegant emulsions.
✦ Biodegradable and globally accepted for cosmetic use; not listed as a restricted substance in EU Cosmetics Regulation Annexes.
✦ More concentrated and economical than BTMS 50 — produces equivalent conditioning performance with measurably less product per batch.

BTMS 85 is a cationic conditioning emulsifier based on Behentrimonium Methosulfate, a quaternary ammonium compound derived from behenic acid, a long-chain fatty acid found naturally in canola, rapeseed, and peanut oil. It was adopted into professional haircare formulation during the latter part of the twentieth century as a gentler, more effective alternative to heavy cationic conditioning agents. Today it is a foundational ingredient in premium conditioner manufacturing and is widely used by independent cosmetic brands and professional formulators worldwide.

What distinguishes BTMS 85 from standard BTMS grades is its elevated active concentration of approximately 85%, which translates into greater efficiency per gram added to a formula. The cationic charge of Behentrimonium Methosulfate creates a strong electrostatic attraction to the negatively charged surface of chemically treated, heat-damaged, or naturally porous hair. This targeted deposition mechanism allows it to coat the cuticle uniformly, reduce fiber-to-fiber friction, improve wet and dry combability, and impart softness and shine without the heavy, waxy buildup associated with less refined conditioning agents.

Bio Shop Pakistan supplies cosmetic-grade BTMS 85 suitable for professional cosmetic formulators, independent haircare brands, and serious DIY beauty crafters.

INCI Name : Behentrimonium Methosulfate (and) Cetearyl Alcohol
Chemical Name : Docosyltrimethylammonium methyl sulfate (with cetearyl alcohol)
CAS Number : 81646-13-1
Molecular Formula : C26H57NO4S
Appearance : White to off-white waxy flakes or pastilles
Odor : Mild, faint characteristic odor
pH (1% solution) : 5.0 – 7.0
Solubility : Insoluble in cold water; dispersible in warm water above 65°C; soluble in heated oils
Specific Gravity : Verify with supplier
Flash Point : >100°C
HLB Value : Not applicable (cationic emulsifier; equivalent ~11 — verify with supplier)
Recommended Use Level : 1% – 5% (leave-on); 2% – 6% (rinse-off)
Type : Cationic conditioning emulsifier
Shelf Life : 24 months from date of manufacture when stored correctly

Skincare (Creams, Serums, Lotions)
★★★★☆
BTMS 85 performs reliably as a primary O/W emulsifier in body lotions and lightweight creams where a smooth skin feel is desired. Use at 2 to 3.5% in the heated oil phase alongside stearyl or cetyl alcohol for stable, well-structured emulsions.

Haircare (Conditioners, Masks, Deep Treatments)
★★★★★
BTMS 85 is the principal conditioning emulsifier for rinse-off conditioners and intensive hair masks, delivering unmatched detangling, slip, and cuticle repair. Melt fully into the oil phase at 70 to 75°C and combine with cetyl alcohol at 3 to 5% for ideal viscosity and creamy texture.

Hair Styling Products (Leave-in, Curl Creams, Heat Protectants)
★★★★★
BTMS 85 excels in leave-in conditioning sprays, curl-defining creams, and heat protectant formulas, providing light conditioning without weighing fine or wavy hair down. Pair with Panthenol or glycerin at 3 to 5% for enhanced moisture retention and long-lasting hold.

Body Care (Butters, Lotions, Balms)
★★★☆☆
BTMS 85 can serve as an emulsifying component in conditioning body lotions and whipped body butters where a water phase is present. Keep use level to 1.5 to 2.5% in body formulas to avoid any waxy residue on skin.

Functional Cosmetics (Deodorants, Baby Care, Conditioning Rinses)
★★★☆☆
BTMS 85 is suitable for creamy deodorant sticks and mild baby rinse-off products as an emulsifier and gentle skin conditioner. Confirm compatibility with any functional actives and verify final pH is within range for the intended application.

When I formulate with BTMS 85, I treat it as both primary emulsifier and conditioning agent in one, which keeps my ingredient list lean and reduces cost per unit. Because of its high active content, I start at the low end of the range — typically 1.5 to 2.5% for leave-on products and 2.5 to 3.5% for rinse-off — and only adjust upward if the emulsion fails stability screening. The most common beginner error I see is using BTMS 85 at BTMS 50 levels, which produces a heavy, waxy conditioner that feels like a coating rather than a treatment.

ADVANCED TIP: For a lightweight, salon-quality rinse-off conditioner, combine BTMS 85 at 2.5% with cetyl alcohol at 4% and Behentrimonium Chloride at 0.5% in the heated oil phase. Process the emulsion at 75°C, cool to 45°C, then add Dimethicone at 1 to 2% and adjust to pH 4.5 to 5.0 with a 10% citric acid solution. This three-component conditioning stack delivers excellent slip, shine, and detangling with minimal product buildup across all hair types.

Normal Skin : ★★★★☆ — Functions well as an emulsifier in balanced daily moisturizers and body lotions at low to moderate use levels.
Dry Skin : ★★★★★ — Provides genuine conditioning and emolliency when combined with heavier fatty alcohols, butters, and hydrating humectants.
Oily Skin : ★★★☆☆ — Use at 1 to 2% maximum in lightweight, water-dominant formulas to avoid a creamy or heavy skin feel.
Combination : ★★★★☆ — Works well at moderate use levels in targeted formulas when lighter esters or toners are included to balance the finish.
Sensitive Skin : ★★★★☆ — Generally well-tolerated; cationic compounds can occasionally cause mild irritation at concentrations above 5%, so patch testing is advised.
Mature Skin : ★★★★★ — Excellent in rich conditioning creams and body preparations where improved texture, emolliency, and moisture retention are priorities.
Acne-Prone : ★★☆☆☆ — Cationic emulsifiers are not ideal for acne-prone skin; use with caution and prefer non-comedogenic, gel-based, or lightweight nonionic systems instead.

CONCEPT 1: Intensive Repair Rinse-Off Conditioner
Usage Level : 3%
Key Ingredients: Cetyl Alcohol, Hydrolyzed Keratin, Dimethicone, Panthenol
Result : A rich, creamy conditioner that rebuilds damaged cuticles, reduces breakage, and leaves all hair types feeling silky and manageable from the first use.

CONCEPT 2: Lightweight Leave-In Curl Defining Cream
Usage Level : 2%
Key Ingredients: Glycerin, Aloe Vera Juice, Behentrimonium Chloride, Fragrance Oil
Result : A non-greasy leave-in cream that defines curl pattern, eliminates frizz, and sustains moisture balance in wavy and curly hair without weighing strands down.

CONCEPT 3: Conditioning Daily Body Lotion
Usage Level : 2.5%
Key Ingredients: Shea Butter, Glycerin, Stearyl Alcohol, Tocopherol (Vitamin E)
Result : A velvety, fast-absorbing body lotion with a smooth, non-tacky finish that delivers daily hydration and mild skin conditioning suitable for all skin types.

NCI Declared : Yes — full INCI declaration required in all cosmetic products in the EU and globally
EU Cosmetics Reg : Permitted — Behentrimonium Methosulfate is not listed in restricted Annexes; used in standard cosmetic practice
Rinse-Off Limit : No specific regulatory limit established; typical industry use up to 6%
Leave-On Limit : No specific regulatory limit established; typical industry use up to 5%
Allergen Alert : No — not classified as a known contact allergen at recommended use levels
Skin Safety : Safe at recommended levels; may cause mild irritation if used above 8% in leave-on formulations
Eye Area Use : Use with caution — avoid high concentrations in eye-area or sensitive periorbital products
Ingestion : Not for internal use
Pregnancy Use : Considered safe in cosmetic applications; consult physician for intensive leave-on products
Child Safety : Safe above 3 years of age in rinse-off formulations at standard use levels
Ventilation : Not required under normal handling conditions
Storage : Store below 25°C in a cool, dry place away from heat sources and direct sunlight
Container : HDPE or polypropylene containers recommended; avoid reactive metals

⚠️ BTMS 85 is a cationic compound and is incompatible with anionic surfactants (SLS, SLES, ALS) and anionic polymers. Combining with these ingredients without compatibility testing will result in precipitation, loss of emulsion stability, or complete formulation failure. At leave-on concentrations above 8%, mild skin irritation is possible in sensitive individuals.

Working pH Range : 4.0 – 7.0 (optimal conditioning performance achieved at pH 4.5 – 5.5 for haircare)
Heat Stability : Stable; melt fully at 65 – 70°C during processing; stable up to 80°C
Freeze-Thaw Stable : Yes
Emulsion Type : O/W
Emulsification Phase: Hot (incorporate into oil phase at 65 – 75°C before combining with water phase)
Compatible With : Fatty alcohols (cetyl, stearyl, cetearyl), silicones (Dimethicone, Cyclomethicone), nonionic emulsifiers, cationic conditioning polymers (Polyquaternium-10, guar hydroxypropyltrimonium chloride), humectants (glycerin, Panthenol, sorbitol)
Incompatible With : Anionic surfactants (SLS, SLES, ALS), anionic polymers (carbomer at full neutralization), soap bases, high-concentration citric acid above pH 3.5
Oxidation Risk : Low — no antioxidant required under normal processing and storage conditions
Discoloration Risk : None under standard conditions; prolonged exposure to temperatures above 85°C may cause faint yellowing of the finished product
Formulation Notes : BTMS 85 must be fully melted in the oil phase before emulsification begins; incomplete melting will produce white particles and an unstable emulsion. Always pair with a co-emulsifier such as cetyl alcohol or stearyl alcohol at 2 to 5% to build viscosity and improve long-term stability.

Q: What is BTMS 85 and how does it differ from BTMS 50?
A: BTMS 85 contains approximately 85% active Behentrimonium Methosulfate versus roughly 50% in BTMS 50, making it significantly more concentrated. You can achieve the same conditioning and emulsifying result at nearly half the addition rate, which reduces formula cost and simplifies weighing for small-batch production.

Q: Can BTMS 85 be used as the sole emulsifier in a hair conditioner?
A: Yes, BTMS 85 can function as a standalone emulsifier in a basic conditioner, but pairing it with cetyl alcohol at 3 to 5% produces a dramatically more stable, thicker, and more elegant product. The fatty alcohol acts as a co-emulsifier and viscosity builder, which BTMS 85 alone cannot adequately provide.

Q: Is BTMS 85 safe for color-treated or chemically processed hair?
A: Yes, and it is particularly well suited for damaged hair because its cationic charge selectively deposits onto the most porous, negatively charged areas of the cuticle. It smooths the surface, reduces color fade from friction, and improves combability without stripping or interfering with color chemistry.

Q: Why is my BTMS 85 conditioner turning out too thin?
A: BTMS 85 is an emulsifier and conditioning agent, not a thickener — viscosity must be built separately. Add cetyl alcohol at 4 to 6% or stearyl alcohol at 3 to 5% to the oil phase, and optionally include guar hydroxypropyltrimonium chloride or Polyquaternium-10 in the water phase to achieve the cream thickness typical of commercial conditioners.

Q: How does BTMS 85 compare to BTMS 50 or Emulsifying Wax NF for conditioner making?
A: BTMS 85 and BTMS 50 share the same active ingredient and conditioning mechanism, with BTMS 85 being more concentrated and requiring lower use levels with less risk of waxy buildup. Emulsifying Wax NF is a nonionic emulsifier with zero conditioning function and is better suited to skincare emulsions — for haircare where detangling and slip are priorities, BTMS-based emulsifiers are the clear technical choice.