1. ABS performance:
ABS is synthesized from three chemical monomers of acrylonitrile, butadiene and styrene. (Each monomer has different characteristics: acrylonitrile has high strength, thermal stability and chemical stability; butadiene has toughness and impact resistance; styrene has easy processing, high finish and high strength.
Polymerization of the three monomers resulted in a two-phase terpolymer, one being a continuous phase of styrene-acrylonitrile and the other being a dispersed phase of polybutadiene rubber. From the morphological point of view, ABS is an amorphous material with high mechanical strength and good comprehensive properties of “hard, tough, steelâ€. It is an amorphous polymer. ABS is a general-purpose engineering plastic. It is widely used and widely used. It is also called “universal plastic†(MBS is called transparent ABS). ABS is hygroscopic and has a specific gravity of 1.05g/cm3. The water is slightly heavy), the shrinkage rate is low (0.60%), the size is stable, and it is easy to shape and process.
The properties of ABS are mainly determined by the ratio of the three monomers and the molecular structure in the two phases. This allows for great flexibility in product design and results in hundreds of different quality ABS materials on the market. These different quality materials offer different properties such as medium to high impact resistance, low to high finish and high temperature distortion. ABS materials have superior processability, appearance characteristics, low creep and excellent dimensional stability and high impact strength.
ABS is a light yellow granular or bead opaque resin, non-toxic, odorless, low water absorption, and has good comprehensive physical and mechanical properties, such as excellent electrical properties, wear resistance, dimensional stability, chemical resistance and surface gloss. And easy to shape. Disadvantages are weather resistance, poor heat resistance, and flammability.
2. ABS process characteristics
2.1 ABS has a large hygroscopicity and moisture sensitivity. It must be fully dried and preheated (for a minimum of 2 hours at 80-90C) before the molding process, and the moisture content should be controlled below 0.03%.
2.2 The melt viscosity of ABS resin is less sensitive to temperature (unlike other amorphous resins). Although the injection temperature of ABS is slightly higher than PS, it does not have a loose temperature range like PS. It is not possible to use a blind heating method to remove the viscosity. It is possible to increase the fluidity by increasing the screw speed or injection pressure. Generally, the processing temperature is preferably 190-235 °C.
2.3 ABS has a medium melt viscosity, which is higher than PS, HIPS and AS. It requires a higher injection pressure (500~1000 bar) of beer.
2.4 ABS material is better at medium and high speed injection speed beer. (Unless the shape is complex, thin-walled parts require a higher injection speed), the product nozzle is prone to gas crevices.
2.5 ABS molding temperature is higher, and its mold temperature is generally adjusted at 25-70 °C. When producing larger products, the temperature of the fixed mold (front mold) is generally about 5 °C higher than the dynamic mold (rear mold). (The mold temperature will affect the smoothness of the plastic part, and the lower temperature will result in a lower finish)
2.6 ABS should not stay in the high temperature barrel for too long (should be less than 30 minutes), otherwise it will easily decompose and yellow.
3. Typical application range:
Cars (dashboards, tool hatches, wheel covers, mirror boxes, etc.), refrigerators, high-strength tools (hair dryers, blenders, food processors, lawn mowers, etc.), telephone housings, typewriter keyboards Recreational vehicles such as golf carts and jet skis.
Top-mount Sinks
Drop-in kitchen sinks, also called self-rimming sinks, overmount sinks, or top-mount sinks, are sink basins that install and sit on top of your kitchen counter. There is a visible rim or lip on the perimeter of the basin that rests just over the cut-out for the sink. Drop-in sinks are supported by this lip and a series of hidden clips that attach to the underside of the countertop.
The Advantages of Drop-In Sinks
Drop-in sinks have some clear advantages over other styles, especially in the kitchen.
Cost
They`re generally cheaper to buy and easier to install than undermount sinks. In fact, even weekend warriors and DIY newbies should have no problem installing a basic overmount sink. If cost is a consideration in your kitchen, an overmount sink with a do-it-yourself install is a great way to stay within budget.
Cleaning
While cleaning may not be your foremost concern when choosing a kitchen sink, it should be considered. After all, you`ll have to care for and maintain your sink regularly. The basin of an overmount sink is easier to clean than the basin of an Undermount Sink.
Protection
If you`ve got soft countertops, drop-in sinks can help protect the edges of the sink cutout.
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Marble and some specialty counter finishes benefit from the added protection provided by the lip of a drop-in kitchen sink basin. It prevents the build up of water on the surface edges of the stone through repeated exposure of use.
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If you have laminate countertops, drop-in sinks are the only option: the particle board below the laminate surface isn`t strong enough to support undermount sinks but plays well with self-rimming basin types.
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