Silicone Concentrates

*Faster Molding Cycles
Adell's silicone concentrates insure fast, effective part ejection and eliminate the need for manually applied (spray-on) release agents. Cycle times can be reduced by as much as 25% - and more.

*Automatic Part Ejection
Internal lubricant system provided by the concentrate permits fully automated production of both conventional and complex parts.

*Uniform Dispersion
The silicone is uniformly dispersed in minute droplets throughout the resin and does not migrate to the surface. There is no contamination of the molded parts or ambient atmosphere.

*Effective Mold Release
Improved distribution of silicone in the resin makes for a more positive mold release system and higher overall molding efficiency. A standard Adell concentrate contains 20% silicone: typical let-downs range from 10:1 to 100:1

*Better Flow - Lower Pressures
Silicone concentrates improve the flow characteristics of most polymers, reducing molded-in stresses and minimizing part warpage. They also permit molding at lower pressures and temperatures, eliminating outgassing, flashing and overpacking. Filling cavities at lower pressures can also cut resin consumption by as much as 5%.

*Far Fewer Rejects
Part rejects caused by poor release, scuffing, sink marks, excessive flashing or short shots are substantially reduced and in most cases eliminated.

*Economical
The cost of Adell's silicone concentrates is much lower than molybdenum disulfide, TFE, spray-on agents and other lubricating methods. Additional savings may be realized when the concentrate is combined with colorants and other additives into a multi-purpose concentrate system.

*Decorates without Need for Cleaning
Since the uniform dispersion virtually eliminates surface residue, molded parts can be readily decorated without cleaning. Parts can be hot stamped, screened, printed, painted, vacuum metalized or labeled with uniformly good results. Secondary welding, joining and sealing operations can be easily accomplished.

*Improves Wear and Bearing Properties
Silicone concentrates, when used in recommended amounts, substantially reduce friction and wear and can also increase the PV limit* of many thermoplastics. Because of the improved wear and bearing properties, use of silicone concentrates may also make it possible to substitute lower priced materials for higher priced resins.

Recommended procedures for obtaining higher productivity with use of Adell Silicone Concentrates

Through Improvement in Mold Release
Desired results can be obtained by adding silicone concentrate in the let-down ratio of 80:1 to 100:1 without changing molding conditions.
Through Improvement in Production Rate
The let-down ratios of 20:1 to 40:1 should be sufficient to do the job. Molding trials will determine optimum concentrate usage. After blending the concentrate with the resin at the desired let-down ratio, proceed as follows:
1. Drain hopper of resin, keeping machine in operation.
2. Fill hopper with resin-concentrate blend and continue operation at normal molding cycles.
3. Wait until approximately 15 shots have been processed before changing processing variables.

The increased rate of flow derived from the use of silicone concentrates will enable the molder to reduce cycles limited by cure time. After the optimum let-down has been determined, stock temperatures can be lowered until parts underfill. Temperatures should then be increased until all cavities fill, at which point cure time can be reduced based on the molder's judgment. Generally speaking, in most cases, the injection pressures and speed will remain the same throughout this process; however, some changes may be necessary depending on the part.
To Enhance Wear and Bearing Properties
Typically, let-down ratios of 10:1 to 5:1 are sufficient to produce the desired results. Optimum concentrate usage should be determined by physical property evaluations of the molded specimins.

Adell Silicone Concentrates are available in the following base resins:
Base Resin
Nylon 66
Nylon 6
Nylon 612
Polycarbonate
Polypropylene (Homopolymer)
Acetal (Delrin*)
Acetal (Celcon*)
Polyester (PBT)
High Impact Polystyrene
Medium Impact Polystyrene
High Density Polyethylene
Low Density Polyethylene
ABS
SAN
Ionomer (Surlyn*)
Modified PPO (Noryl*)
EVA
Polyester (ET)

* Registered Trademarks

Delrin - E.I. DuPont de Nemours & Company, Inc.
Celcon - Ticona
Surlyn - E.I. DuPont de Nemours & Company, Inc.
Noryl - General Electric Company

Adell Code
AV-14
BV-14
CV-14
DV-14
EV-14
FV-14
GV-14
HV-14
IV-14
JV-14
KV-14
LV-14
MV-14
NV-14
PV-14
QV-14
VV-14
WV-14

Coefficient of Friction
The coefficient of friction of nylon 66 is reduced by more than 50% when 3% silicone is added as a polyblend. A 10% addition of silicone shows even more dramatic results.
Tests of glass-filled nylon 66 with silicone demonstrated properties very similiar to the unfilled resin.

Adell's proprietary silicone concentrates, supplied in pelletized form, are available for most thermoplastic materials and offer considerable cost-saving advantages while improving the physical properties of molded parts.

Our line of silicone concentrates constitutes part of a family of high performance thermoplastic compounds which Adell offers to the plastic processor. Our proprietary product line includes nylon 6 and nylon 66; glass-reinforced polypropylene and polyethylene; talc filled, calcium carbonate filled and mica filled polypropylene and others. Write or phone for complete information.