Softgel Defects Explained: An AQL Inspection Guide for Capsule Buyers

A softgel can look flawless in a catalog photo and still disappoint when the carton is opened. Between the encapsulation line, the drying room, and a long sea or air journey, capsules pick up seam stress, surface marks, and moisture shifts that no certificate fully describes. For a buyer, the real question is not whether defects exist somewhere in the lot. It is whether the defect rate sits inside an agreed limit, measured the same way on both sides of the deal.

Most shipments arrive with a certificate of analysis. That paper confirms the fill met its specification on the day of production. It says little about what the shells endured in the weeks after. A short, disciplined receiving inspection closes that gap, and it gives both parties a shared vocabulary when something goes wrong.

A clause that simply says defective capsules will be replaced cannot be enforced, because nobody defined defective. Buyers get much further with a written list that describes each fault in one sentence:

• Seam splits and leakers: fill escapes at the joint, usually traced to sealing temperature or pressure drift.
• Pinholes: tiny openings in the shell surface, often linked to fill moisture or a worn die.
• Deformation and dents: soft shells from incomplete drying, or heat exposure in transit.
• Weight outliers: capsules outside the agreed fill weight window, which changes the dose per unit.
• Mottling or color shift: pigment dispersion problems, or early oxidation of a sensitive fill.
• Surface oil film and sticking: fill migration, or storage above the recommended temperature range.

Once faults are defined, inspection needs a size. The industry standard is ISO 2859-1, also known as ANSI Z1.4. It sorts defects into critical, major, and minor classes, then uses the lot size and an inspection level, normally level II, to fix how many capsules are drawn and how many failures are allowed before the lot is rejected. Two numbers do the work: the sample size and the acceptance number. A plan that draws 80 capsules from a 10,000 piece lot with zero acceptance for critical defects is easy to administer and hard to argue with later. Put the plan, the defect definitions, and the class limits into the quality agreement before production starts, not after a problem appears.

When a suspect lot arrives, process matters as much as the count:

• Quarantine the lot until inspection is signed off, and record the temperature on arrival.
• Photograph defects against a neutral background, with the same lighting and distance every time.
• Retain a sealed sample of at least 30 capsules per lot for the full shelf life claim.
• Agree on a claim window, commonly 14 to 30 days from delivery, plus a corrective action form.

Trend the results across lots, because a trend says more than any single shipment. Leakers clustered in one batch usually point at drying room humidity that day. A rate that climbs over three consecutive batches suggests tooling wear or a fill formula change, not rough handling, and that distinction decides who pays for the rework.

CapsulesBiotech manufactures single-dose softgels for facial serum oils, eye serums, hair oils, body lotions, face creams, and masks, in fills from 0.2ml to 1ml, with 100% plant-based shells or food-grade gelatin. Every lot ships with fill weight records, shell batch data, and a retained sample. Share your target market and positioning with us, and we will return a formula direction, fill specifications, and a production schedule.