The difference is primarily the thermal and chemical compatibility. Traditionally the polyester is used on steel ring bags and polypropylene on the plastic flange. Our 100% polypropylene filter bag is manufactured from FDA compliant material for food grade applications. back to top) Why does my filter bag seem longer than my support basket? Filter bags are basically a two dimensional flat tube with a collar. It must fill up void spaces of a three dimensional support basket.

Polyester films, like USI OptiClear, are clearer and a higher quality than lower grade films, which tend to be foggy. Premium films also endure extreme environments and severe stress conditions more favorably. Films with higher polyester content are more rigid and feel thicker than films with more adhesive content. Polypropylene film is softer than polyester, but still has excellent clarity. See similar questions...

Polyester rope is bright white where as cotton rope is more of a beige color. Polyester rope will last longer outdoors then cotton rope. Some people say that cotton rope is more comfortable then polyester. This is largely a matter of opinion. See similar questions...

Lycra (Spandex) is softer and has greater stretch capability allowing for more flexibility. Its fabric has a rubberized elastic material. This is especially important for Synchro Swimmers. However due to the rubberized elastic material Lycra tends to breakdown earlier than Polyester because the chlorine attacks the rubberized elastic material in the fabric. See similar questions...

Polypropylene (PP) is a plastic with good chemical resistance, is strong, and has a high melting point making it good for hot-fill liquids. Polypropylene is found in flexible and rigid packaging to fibers and large molded parts for automotive and consumer products. See similar questions...

Polyester is a man-made fabric which results in a garment which is extremely light and comfortable to wear, with excellent quick drying and chlorine resistant properties. Polycotton is a more natural fabric and feels more like the t-shirts that you put on your children. This is ideal for infant or sensitive skins, but takes a little longer to dry than polyester. Both fabrics achieve the same SPF of 50+ and fit in the same way. See similar questions...

a) Acetate: Acetate provides excellent drapability and softness, and is moth resistant. Acetate is dry-clean only. b) Polyester: Polyester is strong; moth resistant; resistant to stretching, most chemicals, and abrasion; is crisp and resilient when wet or dry; retains heat-set pleats and creases; is more wrinkle resistant than Acetate; and is easily washed in ordinary washers and dryers. See similar questions...

For orders less than $100, your shipping charges will be calculated upon checkout. Note that you will learn your shipping charges BEFORE you finalize your order. When you checkout, simply select Standard-Residential (if delivery is to a home) or Standard-Business (if delivery is to a business). If you choose Standard-Residential or Standard-Business, based on what you order and the delivery address, we will ship your order either via U.S. Mail, FedEx Ground, or FedEx Home Delivery. See similar questions...

They are not recommended for use in high humidity or exposure to water, as volume swell and reduction of properties may result. Because of inherent advantages in low heat build-up, polyether-based urethanes are recommended for applications undergoing medium to high stress. See similar questions...

Yes. The material has no negative effect on health. It causes no itching or skin irritation. Heat-welded polyester does not release fibres into the air (which is a cause of medical concern). This is one reason why many hospitals and buildings with air-conditioning systems choose NOVAtherm and NOVAhush. See similar questions...

Laminating resin is greenish blue in color and is the basic first coat of resin; it is used to adhere the cloth to the blank (this resin will only dry tacky and not sandable!) Sanding or hot coat resin or filler coat is almost the same thing; it is lam resin with surfacing agent (styrene monomer and paraffin wax) mixed in. Paint it on the laminated surfboard to fill the fiberglass weave and make the board sandable. Gloss/finish Resin is pink in color and is the final coat of resin. See similar questions...

Yes, we do, but in most cases, surfaces such as Teflon, polyethylene and polypropylene are not easily bonded and require a surface treatment to achieve any desirable bond strengths. See similar questions...

UltraFiber 500™, with all its benefits, offers a significant combined advantage versus polypropylene fibers - superior finishing, excellent crack reduction, improved hydration, better bonding with cement, higher fiber tensile strength, cost effective bulk dispensing, and more. See similar questions...

Polypropylene is also known by the brand name of Kimdura?. Some automotive companies require the use of Polypropylene labels on parts being shipped to their assembly lines. Polypropylene is resistant to moisture tearing, dirt and grease. Some other suitable applications include identification and barcoding for warehouse shelf and bin labels. You can use wax and wax/resin ribbons to print on polypropylene labels. See similar questions...

Not a good plan. You've gone through all that trouble to put a wicking layer close to your skin, don't stick a highly absorbant thermal conducting layer in between you and that great wicking stuff. See similar questions...

UltraFiber 500™ fibers are flexible, bond well with cement paste, disperse quickly and efficiently in concrete, and are not ionically attracted to one another. As a result, unlike polypropylene, UltraFiber 500™ fibers do not ball under the broom, do not stick to troweling tools, do not create surface blemishes, do not exhibit surface "fuzz," and do not slow down the finishing process. See similar questions...

UltraFiber 500™ in concrete has higher fiber tensile strength than typical polypropylene. The fiber tensile strength of UltraFiber 500 is 90-130 KSI, and this compares to typical polypropylene with fiber tensile strength of 30-70 KSI. See similar questions...

ANSWER: Yes and No. The 1˝ and larger polypropylene models are fiberglass reinforced and CANNOT be used with hydrofluoric acid. The 1/4˝ and 1/2˝ models are pure polypropylene and can safely be used with hydrofluoric acid. 1˝ bolted plastic pumps are pure polypropylene and may also be used for Hf. ANSWER: The degree symbol means degrees baume. In this case the 66° is actually 98% in strength. You will find this symbol oftentimes used when describing sulfuric acid. See similar questions...

They differ in many ways, but as reinforcement for concrete, these differences are especially notable. Polypropylene, nylon and the other synthetic fibers used in concrete serve only one purpose: to restrain plastic shrinkage during the first 24 hours after concrete is poured. Because of their high elongation, or "stretchiness", these fibers are essentially useless for the drying shrinkage and other sorts of cracking that all concrete suffers from. See similar questions...