Kitchen sink materials compared: stainless steel, granite composite and more

A kitchen sink is fixed into the countertop, connected to the waste and the water supply and then used several times a day. Changing it later means cutting the counter again, so the choice should be made on the material, the mounting and the cabinet it will sit in rather than on the look alone. This guide compares the common materials sold in Singapore and the measurements to take before you order.

Stainless steel gauge and grade

Stainless steel is the default for a reason: it is light, hygienic, tolerates hot pans and does not chip. Two numbers tell you the quality. The gauge is the sheet thickness, and a lower number is thicker: 18 gauge is about 1.2 mm and 16 gauge about 1.5 mm. A 16-gauge bowl dents less, flexes less under a full basin of water and sounds duller when a tap runs into it. The grade is the alloy: 304 stainless (18 percent chromium, 8 percent nickel) resists rust and the salt and acids of cooking; the cheaper 201 grade is prone to rust spots over time and is best avoided for a sink.

The finish changes how the sink ages. A brushed or satin finish hides water marks and fine scratches; a mirror polish looks sharp on day one and shows every scratch afterwards. Nano or PVD coatings add a water-repelling layer that keeps the bowl cleaner and comes in colours such as gunmetal and black; they wear slowly at the drain and the front edge, so expect the colour to soften over years of use. Look for sound-deadening pads on the underside, which take the drumming out of a running tap.

Granite composite

Granite composite sinks are moulded from a high proportion (typically around 80 percent) of quartz or granite particles bound in acrylic resin. The surface is matte, hard and quiet, and it holds up to scratches from cutlery and pans better than stainless. Makers quote a heat-resistance figure that covers a hot pan, though a trivet is still wise for pans straight off the hob. Colours run from white and beige through grey to black, and the colour goes right through the material, so a chip does not show a different colour underneath.

Two practical points. First, weight: a composite sink is typically 15 to 25 kg empty, and an undermounted one needs a support frame or battens inside the cabinet, not just the adhesive. Second, care: lighter colours can take stains from tea and curry if they are left overnight, and abrasive powders dull the surface, so cleaning is a soft cloth and a mild cleaner. Fireclay and ceramic sinks behave similarly but chip more easily on the rim.

Undermount, top-mount or flush

How the sink meets the countertop decides both the look and what countertop it needs. An undermount sink sits below the counter with the cut edge of the counter exposed, so crumbs sweep straight into the bowl and there is no rim to clean around. It needs a solid countertop that can be polished at the cut edge: quartz, granite, solid surface or sintered stone. A laminate or plywood counter will swell at the exposed edge and is not suitable.

A top-mount (drop-in) sink rests on its rim over a rough cut-out and works with any countertop, including laminate; the rim is where grime collects and it stops you sweeping water off the counter into the bowl. A flush-mount sink sits level with the surface in a precise rebated cut-out and is the hardest to fabricate. For an undermount or flush sink the fabricator needs the sink's template and the maker's cut-out tolerance before cutting; confirm the exact model with the counter fabricator before the counter is made.

Single or double bowl and depth

The sink has to fit inside the base cabinet with room for the clips and the tap. As a rule the sink's overall width must be at least 40 to 50 mm less than the cabinet's internal width: a 600 mm cabinet takes a sink up to about 550 mm wide, an 800 mm cabinet up to about 750 mm and a 900 mm cabinet up to about 850 mm. In an HDB kitchen the sink cabinet is most often 800 or 900 mm, which fits a large single bowl or a 60/40 double bowl.

A large single bowl is the more practical choice for Singapore cooking: a wok and a roasting tray lie flat in it, and a colander or a second basin can be added when you want two zones. A double bowl suits households that wash by hand and want a rinsing side, at the cost of a smaller main bowl. Bowl depth of 200 to 230 mm is comfortable; deeper bowls hide dishes but mean more bending and less room for the trap underneath.

Check the waste outlet height. The bottom of the bowl plus the strainer and the bottle trap must sit above the waste pipe stub in the wall; a 230 mm bowl undermounted beneath a 40 mm counter on a typical base cabinet leaves less room than you expect, and a stub that is too high forces the trap to drain uphill. Measure from the cabinet floor to the centre of the waste stub and give it to the supplier with the counter thickness.

Matching the faucet

Decide where the tap will mount: through a pre-drilled hole in the sink deck (most top-mount sinks have one or two) or through the countertop behind an undermount sink. Count the holes you need: one for a single-lever mixer, a second for a soap dispenser or a filtered-water tap. Mixers need both hot and cold supply at the sink; if the kitchen has only a cold feed and no water heater point, choose a cold-water tap.

Pull-out and pull-down taps make a single bowl far more useful. Check the spout height against any wall cabinet or window ledge above the sink, and the spout reach so that water lands near the centre of the bowl rather than at the back wall, which is the main cause of splashing. An aerated flow (typically in the region of 6 to 8 litres a minute) is enough for a kitchen and splashes less in a shallow bowl.