Adeps Solidus 43

Pharmaceutical Grade Hard Fat Type 43 - Maximum-Melting GMP Base for Ultra-Sustained Release and Specialty Formulations

At the top of our melting-range ladder sits Pharmaceutical Grade Hard Fat Type 43 - a 42–44 °C melting-point grade built for the most demanding sustained-release and specialty applications. This is not a commodity grade. It is a specialized excipient for formulation teams developing 24-hour-plus rectal delivery systems, high-potency opioid products, and veterinary long-acting boluses where the base must remain intact for extended periods. If your development program has hit a wall with lower-melting grades because the release rate is too fast, Type 43 is the tool that will let you push the release window further.

We will be transparent: Type 43 is our most expensive grade, and it requires the most formulation development. But for the products that need it - high-value specialty drugs where a 24-hour release profile is a competitive differentiator - the cost of the base is negligible compared with the value of the finished product. If you are developing such a product, let us talk early. Our technical team can help you avoid the common formulation pitfalls that waste months of development time.

Pharmaceutical Grade Type 43 is specified for 24-hour to 36-hour sustained-release rectal opioid formulations (morphine, hydromorphone, fentanyl), where the slow erosion of the high-melting lipid matrix provides a steady drug plasma concentration over an extended period. It is also used in rectal corticosteroid formulations for inflammatory bowel disease maintenance therapy, and in veterinary long-acting boluses for cattle and horses where a single administration provides 72 hours of drug delivery.

For human pharmaceutical use, Type 43 is typically blended with Type 36 or Type 38 in ratios of 50:50 to 80:20 (Type 43:lower grade). The exact ratio depends on the target release profile, the API's lipid solubility, and the desired erosion rate. Our technical team can provide preliminary blend recommendations based on your API's physicochemical properties and target release time.

Processing: melt at 55–60 °C (the highest in our catalog). Critical: verify API thermostability at this temperature. For heat-sensitive APIs, use a solvent-granulation approach or consider a lower-melting grade with a higher Type 43 blend ratio. Pour at 44–47 °C. Mold cooling at 5–10 °C for efficient demolding.

Supplied in secure bulk packaging with protective inner liners, with alternative packaging formats available on request. Type 43 is the most transit-stable grade in our catalog - it will not soften or deform even in the most extreme shipping conditions. No cold chain or insulated container is required.

Full pharmaceutical-grade documentation package: Certificate of Analysis covering the full test panel, Certificate of Origin, TSE/BSE declaration, residual solvents statement, GMP certificate, ISO 9001 certificate, MSDS, and stability study summary. DMF reference LOA available on request. Quality agreements with adequate advance change-control notification are standard.

Because Type 43 is a specialty grade produced on a campaign basis, lead times follow a standard schedule and we recommend placing orders well in advance to align with your production timeline. For annual-contract clients, we offer dedicated production slots, a reserved safety stock allocation, and price protection for the contract duration.

Technical support: for clients developing Type 43-based formulations, we assign a dedicated technical contact who can assist with blend optimization, processing parameter recommendations, and troubleshooting. We can also provide small-scale development samples for formulation screening.

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