Custom Compounders Since 1973

Product Comparison

Product Additives and Physical Properties

Plastics Group offers its customers a variety of products, compounded using additives that ultimately impact their strength, flexibility and thermal capacity.  Here is a brief overview to assist you in selecting the Polifil® product that best suits your application.  For additional guidance in selecting the most appropriate product we compound, please contact our sales department at

Talc-Reinforced Polypropylene

The addition of talc measurably impacts both the stiffness and high temperature performance of any polypropylene. As a result of the increased stiffness, talc can be used to decrease part thickness while maintaining part integrity, which in turn, ultimately provides cost savings. Typical applications for talc-reinforced polypropylenes are high-heat environments, including components for appliances, under-the-hood automotive parts, and thermo-formed packaging products, specifically microwaveable products.

Mica-Reinforced Polypropylene

Like talc, the addition of mica improves both product stiffness and high temperature performance, but due to innate structure of the mineral, provides an even greater boost to these properties. Expect end-use applications to be similar to those where talc is utilized. Additionally, the pearlescent nature of the material can allow for special effects, and as such, finds occasional use in packaging and housewares.

Calcium Carbonate-Reinforced Polypropylene

The addition of calcium carbonate yields a finished product with an excellent balance of stiffness and impact, and, in many instances, can enhance toughness of unfilled resins. Amongst fillers, it provides both exceptional appearance and color consistency. These materials are commonly used in building and construction products, and in any industrial applications where durability is an absolute requirement.

Glass-Reinforced Polypropylene

The incorporation of glass fibers in polypropylene (referred to as either glass reinforced or glass-filled polypropylene) produces compounds with a measurable increase in strength over any polypropylene without an additive. TPG offers a variety of the glass-filled polypropylene compounds that range in color, glass content, flame-retardant capability, and warp control.

In general, glass-reinforced polypropylene compounds are used in structural components that require higher levels of stiffness, strength and heat resistance and are appropriate for use in a variety of appliance, automotive, and furniture applications.

Thermoplastic Polyolefin-Reinforced Polypropylene

Adding thermoplastic polyolefin markedly increases product flexibility without sacrificing product sturdiness. This makes it an excellent option for applications that require outstanding impact properties at both ambient and low temperatures like automobile bumpers and lawn and garden machinery guards.

Water Safe (WS)

These grades are manufactured from raw materials such as PP homopolymer and glass fibers that will allow the compound to meet the requirements of NSF/ANSI 61 for potable water applications. Physical properties should be comparable to GFPPCC series values.

Laser Marking (LM)

These grades are manufactured with specialty additives that allow the compounds to be marked by means of a beam-steered laser in the 1060 to 1070 nm wavelength range. The radiant energy is absorbed by the material and converted to thermal energy. The thermal energy in turn induces reactions in the material substrate that allows for the marking of plastic extruded and injection molded parts. Physical properties should be comparable to non-LM grades.

Recycled Content (RC)

These grades are compounded in the event a customer needs some recycled content in their product to meet their requirements. Recycled content is normally in the 25% to 30% range, but can be as high as 50%. These materials will see a slight drop in physical properties at the 25% to 30% loading. However, at higher RC loadings, there will be a more severe drop off in physical properties.

Ultra Violet (UV)

These grades have a UV additive package incorporated during the extrusion compounding process to improve the polymers resistance to UV (ultra violet) attack. This attack is due to short wavelength UV radiation >275nm causing a free radical decomposition reaction of the polymer. These UV absorbers are free radical scavengers that convert UV thermal energy to vibration energy which is dissipated. These products are sacrificial and are consumed over time. Protection levels depend on concentration and outdoor exposure conditions. Physical properties are comparable to non-UV grades of the same composition.

UV grades are used in outdoor applications with both direct and indirect sunlight exposure. In the case of black, pre-colored materials, we can increase the carbon black loadings to increase the level of UV protection in the part.


These grades are manufactured with components that meet the Code of Federal Regulations with regard to food contact applications - specifically, 21 CFR 177.1520 (c) (3.1), 21 CFR 182.70, and 21 CFR 182.90. Physical properties are similar to comparable non-FDA grades.

The FDA grades are used for components that either store food products or components that are in food contact during the food manufacturing process.