護唇膏與油膏

solids %        = (waxes + butters) ÷ total × 100
mean melting pt = Σ(massᵢ × Tᵢ) ÷ Σmassᵢ     # over what publishes one
containers      = ⌊batch ÷ (V × ρ × fill)⌋   # ρ ≈ 0.92 g/mL, not 1

• Solid fraction = Σ(mass of waxes and butters) ÷ total mass. A composition figure, not a measurement of the finished balm.
• Mass-weighted mean of the ingredients’ own published melting points: T = Σ(massᵢ × Tᵢ) ÷ Σmassᵢ, each Tᵢ from that ingredient’s record. — A mixture does not melt at the mean of its components’ melting points — it softens over a range, and a wax network can hold a much lower-melting oil solid well above that oil’s own melting point. Read this as a comparison between two of your own formulas, not as the temperature the balm melts at.
• Beeswax as a share of the balm, as the craft formulates it: lip balm in a tube about 20–30 %, in a tin or pot 12–20 %, a salve 10–20 % (beeswax to oil 1:4 to 1:8), a lotion bar 25–35 % (1:1:1 wax, butter and oil is 33 %). Collected from published formulations: Humblebee & Me’s beeswax to oil ratios; Formula Botanica on natural cosmetic waxes; Mountain Rose Herbs’ salves and lotion bars; Kasparavičienė et al. 2016 on lipstick (a firm stick at 19.6 % beeswax). — Conventions collected from how balms are written, not measured thresholds, and for beeswax: candelilla, carnauba and sunflower wax set the same firmness at a lower share. Hard butters add structure too, which the solid fraction shows. Warm climates push every band up.
• Tubes and tins are sold by volume; a balm’s density is close to that of its oils, ≈ 0.90–0.95 g/mL. The default assumes 0.92. — Weigh one filled tube to calibrate. Fill weight also depends on how far from the rim you stop.