Alpha International G2418 Granite Composite Single Bowl Undermount Cutout
Description
The Alpha International G2418 granite composite undermount sink represents a premium alternative to traditional stainless steel, offering the aesthetic richness and acoustic advantages of composite materials in a substantial 24" x 18" single bowl configuration. With an impressive 9.5" depth and generous 22" x 16" bowl interior, this model provides exceptional workspace for demanding kitchen applications while complementing stone countertop installations through coordinated material aesthetics. For countertop fabricators, the G2418 presents distinctive installation characteristics—the 1" perimeter rim combined with R10 radius corners (approximately 0.394") creates gentle curves that simplify CNC programming compared to zero-radius designs while maintaining contemporary visual appeal. This comprehensive DXF template package delivers manufacturer-verified specifications across four essential installation variants, ensuring precision fabrication regardless of countertop material or design approach. The granite composite construction introduces weight and structural considerations beyond standard stainless steel sinks, making proper template selection and installation technique critical for long-term performance.
Dimensions
- Overall Width
- 24"
- Overall Depth
- 18"
- Bowl Width
- 22"
- Bowl Depth
- 16"
- Corner Radius
- 0.3937"
Specifications
- Manufacturer
- Alpha International
- Model Number
- G2418
- Installation Type
- Undermount
- Bowl Configuration
- Single
- Material
- Granite-Composite
- Min. Cabinet Width
- 27"
- Downloads
- 0
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The Alpha International G2418 granite composite undermount sink represents a premium alternative to traditional stainless steel, offering the aesthetic richness and acoustic advantages of composite materials in a substantial 24" x 18" single bowl configuration. With an impressive 9.5" depth and generous 22" x 16" bowl interior, this model provides exceptional workspace for demanding kitchen applications while complementing stone countertop installations through coordinated material aesthetics. For countertop fabricators, the G2418 presents distinctive installation characteristics—the 1" perimeter rim combined with R10 radius corners (approximately 0.394") creates gentle curves that simplify CNC programming compared to zero-radius designs while maintaining contemporary visual appeal. This comprehensive DXF template package delivers manufacturer-verified specifications across four essential installation variants, ensuring precision fabrication regardless of countertop material or design approach. The granite composite construction introduces weight and structural considerations beyond standard stainless steel sinks, making proper template selection and installation technique critical for long-term performance.
Installation Overview
Installing the Alpha International G2418 granite composite sink requires understanding both standard undermount protocols and the material-specific characteristics of composite construction. The sink's substantial 24" x 18" overall footprint with 22" x 16" bowl opening creates a 1" rim perimeter for mounting systems, while the R10 corner radius (approximately 10mm or 0.394") provides gentler stress distribution compared to sharp-cornered designs. This template package includes four proven cutout variants: the no-reveal configuration (22" x 16") cuts flush to the bowl edge, maximizing visible bowl opening and creating seamless transitions between sink and stone—popular in contemporary installations where visual continuity is emphasized. The 1/8" reveal variant (21.75" x 15.75") is the industry-standard specification, creating a subtle shadow line that provides installation tolerance while maintaining refined aesthetics—this is the most commonly requested option for residential projects. The 1/2" overhang configuration (21" x 15") delivers substantial stone coverage onto the sink rim, maximizing contact area for both mechanical clips and adhesive bonding systems—particularly important for granite composite sinks which weigh significantly more than equivalent stainless steel models (typically 25-35 lbs vs. 10-15 lbs). The drop-in variant (24" x 18") matches the sink's outer dimensions and can accommodate alternative top-mount installation if design requirements change. Granite composite material requires specific adhesive compatibility—verify that undermount adhesives are rated for non-metallic sinks, as some silicone formulations designed for stainless steel may not achieve optimal bonding with composite surfaces. The G2418 requires minimum 27" cabinet width, though 30" or 33" bases provide better access for plumbing, disposal units, and under-sink storage. The generous 9.5" depth offers exceptional functional capacity but demands verification of disposal and plumbing clearances beneath standard height countertops.
CNC Cutting Notes
CNC fabrication of the G2418 cutout benefits from the R10 corner radius (approximately 0.394"), which significantly simplifies tool path programming compared to zero-radius rectangular designs. The gentle corner allows continuous tool paths without plunge-and-retract sequences or specialized corner-cutting routines. For natural stone materials (granite, marble, quartzite), use 1/2" diameter end mills that can navigate the radius corners smoothly while maintaining reasonable cutting speeds. Program tool paths with full radius corner transitions, eliminating the stress concentration and chip-out risk associated with sharp corners. In quartz and porcelain slabs, the radiused corners still require conservative feed rates but present substantially lower chipping risk than zero-radius geometry—maintain 60-70% of straight-run feed rates through corner transitions. The G2418's substantial cutout area (approximately 352 square inches for the no-reveal variant) generates significant waste material requiring robust support during cutting. Use multiple vacuum zones or mechanical clamps positioned well outside the cut perimeter, ensuring the waste piece remains stable through final breakthrough. For slabs with dramatic veining or color variation, orient the cutout to optimize aesthetic appearance around the sink perimeter—the large bowl opening makes material selection and orientation particularly important. When programming the 1/8" and 1/2" reveal variants, verify that reduced cutout dimensions still provide adequate rim coverage, particularly at the radiused corners where geometric calculations differ from straight edges. The sink's 1" rim width accommodates standard undermount clip systems, though the composite material's weight demands more clips than equivalent-sized stainless sinks—specify 8-10 clips minimum for the G2418 (3 per long side, 2 per short side). Leave 0.020-0.025" stock on all exposed edges for hand-polishing to final dimension and desired edge treatment. The R10 corner radius simplifies hand-finishing compared to zero-radius designs, as fabricators can use flexible hand pads to create smooth, uniform corners without the precision demands of sharp geometry. For 3cm materials, verify that the sink's 9.5" depth and composite construction weight are compatible with your selected undermount clip system—some shallow-reach clips may not provide adequate support for this combination.
Material Compatibility
The G2418 template supports professional fabrication across all contemporary countertop materials, with the granite composite sink material creating natural aesthetic coordination with stone countertops. Quartz surfaces (Cambria, Caesarstone, Silestone, Q Premium) pair exceptionally well with granite composite sinks, as both materials share engineered construction and can be color-coordinated for integrated appearance. The radiused corners reduce stress concentration in quartz, making this sink configuration more forgiving than zero-radius designs in brittle engineered materials. Use sharp diamond tooling and maintain conservative feed rates through corners despite the radius—quartz remains prone to microchipping if cutting parameters are too aggressive. Natural granite creates ideal aesthetic harmony with granite composite sinks, offering opportunities for near-perfect color matching between countertop and sink materials. The G2418's substantial size works well in granite slabs, providing ample surrounding material for structural integrity even in exotic varieties with pronounced veining. Orient high-movement grain patterns away from narrow land areas to maximize structural performance. Marble applications work well with the G2418 provided adequate land areas are maintained (3" minimum, 4" preferred from cutout edge to slab perimeter). The radiused corners distribute stress more evenly than sharp geometry, reducing fracture risk in marble's comparatively low tensile strength. Consider the color and veining relationship between white/light marbles and darker granite composite sinks, as high contrast can be either dramatic or discordant depending on overall design intent. Solid surface materials (Corian, Hi-Macs) machine easily with this template and offer interesting design possibilities—composite sinks in coordinating or contrasting colors can create custom integrated appearances. The radiused corners are trivial to cut in solid surface using standard router bits. Porcelain slabs provide excellent structural performance and can be color-coordinated with granite composite sinks in black, grey, or brown tones popular in both material categories. The R10 corners cut cleanly in porcelain with proper diamond tooling and water cooling. Ultra-compact surfaces (Dekton, Neolith) represent premium pairings with granite composite sinks, as both materials target high-performance markets. The G2418's radiused corners reduce tool wear compared to zero-radius cuts in these extremely hard materials.
Where to Buy
The Alpha International G2418 granite composite sink is available through professional plumbing distributors, kitchen and bath showrooms, fabrication material suppliers, and Alpha International's dealer network. As a composite material product, the G2418 typically commands higher pricing than equivalent stainless steel models, generally retailing between $250-450 depending on color selection, gauge specification, and order volume. Professional fabricators should establish accounts with authorized Alpha International distributors to access contractor pricing on both sinks and related installation materials. The G2418 (product designation GU2418B in Alpha's catalog) is offered in multiple color options including black, white, beige, and grey tones designed to coordinate with popular countertop materials—verify color availability as some options may be special-order items with extended lead times. Online retailers including specialized kitchen fixture e-commerce platforms stock various Alpha International granite composite models, though color selection may be limited compared to distributor ordering. The manufacturer's website (alpha-int.com) provides a DXF file library where the G2418/GU2418B specifications can be downloaded for template verification and CNC programming—this resource is particularly valuable for confirming dimensions before sink arrival and identifying the exact corner radius specification. Lead times for granite composite sinks typically run 7-21 days depending on color and finish, somewhat longer than stainless steel models due to more complex manufacturing processes. When ordering, specify the exact color designation and verify that undermount installation hardware is compatible with composite materials—some clip systems designed specifically for stainless steel may not perform optimally with composite construction. Professional installation requires undermount adhesive rated for non-metallic sinks; verify compatibility before ordering standard silicone products designed for stainless steel. For commercial projects or custom color matching requirements, contact Alpha International directly regarding special-order capabilities and volume pricing. Companion accessories including protective sink grids sized for the 22" x 16" bowl interior are available separately and recommended for preserving the composite surface finish.