Rustic Oak 190mm Long Plank Engineered Flooring EF Grade | AMUER NC-02 | Long Plank Flooring | AMUER Engineered Hardwood Flooring Manufacturer

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Categories	Long Plank Flooring
Brand	AMUER Engineered Hardwood Flooring Manufacturer
Model	NC-02
FOB port	Dalian
Terms of Payment	L/C, T/T

AMUER · OAK 3-LAYER · CHINA FACTORY

Rustic Oak 190mm Long Plank Engineered Flooring EF Grade — NC-02

NC-02 is a 190mm long plank rustic oak engineered floor in EF maximum natural character grade, brushed and finished with UV lacquer: 14/3mm three-layer construction with a 3mm solid European oak wear layer, click floating installation. EF grade is the highest natural character specification available in the AMUER range. Where AB or ABC grades are selected for their refined, clean natural character, and DE and DEF grades for their prominent knots and bold grain, EF grade is specified for maximum raw drama — the full, unfiltered spectrum of European oak’s natural character including large open and filled knots, black mineral streaks, prominent filled cracks, bark inclusions, wild swirling grain, and the widest possible colour variation from pale cream sapwood to deep amber heartwood. NC-02 presents this maximum character in a 190mm wide long plank format that is wide enough to display each board’s full individual character from edge to edge. The brushed surface opens the grain structure to add tactile texture without obscuring the natural features that make EF grade distinctive, and UV lacquer provides a durable, low-maintenance protective film over the raw natural character of the species. NC-02 is the specification for projects that want genuine, maximally-dramatic European oak character — a floor that reads as emphatically natural, aged, and materially alive in every board.

CE · FSC Chain of Custody · EUDR · ISO 9001:2015

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arboren@arboren.com

www.amuerflooring.com

Full Product Specification

Specification	NC-02 Detail
Product Code	NC-02
Species	Top layer European Oak; Poplar core and backing layer
Construction	3-Layer Engineered Wood Flooring — cross-ply solid timber core for dimensional stability
Total Thickness	14/3mm (14mm total, 3mm wear layer)
Top Layer	3mm solid European oak — supports 1–2 light sanding cycles
Board Width	190mm
Board Length	1,900mm
Colour	NC-02 Natural EF — warm honey-amber to rich amber-gold; the authentic unmodified natural colour of European oak at EF grade; EF grade produces the widest colour range available: pale cream sapwood at one extreme, deep warm amber-brown heartwood at the other, with dramatic board-to-board colour variation across the full installed floor; black and dark-grey mineral streaks appear as strong colour accents across the warm honey ground; no stain, bleach, dye, or chemical treatment — 100% natural oak colour; the warm tone deepens slightly under UV lacquer
Surface Treatment	Brushed — wire-brush treatment opens the natural grain structure by removing softer early-wood fibres; leaves harder late-wood grain ridges raised; adds visible grain texture to every board face; on EF grade, the brushed treatment accentuates the dramatic natural features — knot halos, wild grain swirls around knots, mineral streak edges — with a raised-grain texture that adds tactile and visual depth to each feature; in directional light, the brushed grain adds micro-shadow to the complex EF grade topography, further emphasising the natural character features
Finish	UV Lacquer — UV-cured polyurethane lacquer; hard, durable surface film over the brushed EF grade surface; enhances and slightly enriches the natural honey-amber oak colour; satin sheen level; low-maintenance: no periodic re-oiling required; strong resistance to everyday wear, scuffs, and household liquid spills; seals the EF grade’s open features (factory-filled knots, mineral streaks, filled cracks) with a stable, protective film
Grading	EF — Maximum Natural Character Grade: the highest available character specification in the AMUER range; all naturally occurring features of European oak are present and maximised: large open knots (factory-filled) from 20mm to 70mm+; prominent black and dark-grey mineral streaks running across the full board face; filled cracks and checks; bark inclusions; wild swirling grain around knots; interlocked and cross-grain patterns; dramatic colour variation from pale cream sapwood to deep amber heartwood; significant sapwood inclusion; all features structurally stable and factory-filled where required; EF grade is not selected for uniformity — it is selected because every board is a unique expression of the species’ full natural range
Edge Profile	Micro-Bevel — precision machined chamfer on all four board edges; uniform V-groove shadow line between boards; on a wide 190mm board with maximum EF character, the micro-bevel shadow line provides a clean, consistent board boundary that gives the eye a reference point amid the dramatic natural features of each board face
Installation	Click floating (Uniclic-compatible) — no adhesive required; suitable for concrete screed, existing tiles, timber subfloor; expansion gap minimum 12mm at all walls; 48-hour acclimatisation required
Underfloor Heating	Compatible — maximum surface temperature 27°C (hydronic and electric)
Emission Class	E1
Certifications	CE (EN 13489) · FSC Chain of Custody · EUDR · ISO 9001:2015
MOQ	200 m² per SKU
Lead Time	45 business days (standard) — 10–15 days for repeat orders with spec on file
Packaging	Carton box with protective foam · Custom OEM packaging available
Production	AMUER China Factory — 50,000 m² · ~300 workers · Est. 1997

PRODUCT OVERVIEW · NC-02 RUSTIC OAK EF GRADE

EF Grade at 190mm — Maximum Natural Character in a Wide Long Plank

NC-02 is the maximum natural character product in the AMUER long plank range: a 190mm wide brushed oak long plank in EF grade, finished with UV lacquer and installed as a click floating floor. EF grade is the top of the character grading hierarchy — above DE, DEF, CDE, and all other grades in the AMUER catalogue. Where a DE or DEF grade floor has prominent knots and bold grain, an EF grade floor has all of this and more: larger knots, more dramatic mineral streaks, filled cracks and checks, bark inclusions, wilder grain, and the widest possible colour variation. EF grade is not specified by clients who want a clean, consistent floor; it is specified by those who want the most emphatically natural, most materially alive, most dramatically characterful European oak available.

At 190mm width, each board in NC-02 is wide enough to display the full drama of EF grade character at board-face scale. A large open knot with a 50mm diameter and a swirling halo — common in EF grade — is visible from across the room on a 190mm board; on a narrower board it would be cropped or divided by the board edge. The 190mm format allows each board to present its individual character as a complete composition: the knot at one position, the mineral streak running diagonally across the board face, the pale sapwood band at one edge, and the wild grain arching around the knot halo — all readable within a single board. The 1,900mm board length gives sufficient run for the grain to establish its direction, arc, and movement before the end joint.

The brushed surface on NC-02 is calibrated to the EF grade’s dramatic topography. The wire-brush treatment opens the grain channels and leaves the late-wood ridges raised, adding texture to the entire board face — including across the knot halos, along the mineral streak edges, and through the wild grain swirls. In directional or raking light, this brushed texture adds micro-shadow to the complex EF grade surface, further emphasising the natural features. The combination of maximum character and brushed texture produces a floor that reads as richly three-dimensional in its natural quality — not flat, not lacquered-looking, but genuinely alive with material depth.

UV lacquer is the correct finish for NC-02. The EF grade’s open and factory-filled knots, filled cracks, and mineral streaks are sealed and protected by the UV lacquer film, which prevents any lifting or deterioration of the filled features in residential use. UV lacquer also means no periodic re-oiling — the natural honey-amber colour and brushed grain texture remain stable and protected without maintenance, making NC-02 a practical choice despite its high-character specification.

Design Guide

NC-02’s EF grade natural oak, warm honey-amber colour, 190mm wide long plank, brushed grain texture, and UV lacquer finish place it in warm, characterful, and emphatically natural interior contexts. The EF grade’s dramatic natural features make the floor a design statement in itself — the interior palette should complement and frame it rather than compete with it.

Farmhouse, Barn & Country Natural

NC-02 is at home in farmhouse, barn conversion, and country-natural interiors where raw material quality and honesty are the primary aesthetic values. EF grade oak with its large knots, mineral streaks, and wild grain reads as the authentic floor material of these spaces — the material that was always there before engineered replacements existed. Works with stone walls, lime-washed plaster, rough-sawn timber, natural linen, undyed wool, and earthenware ceramics.

Warm Scandi & Natural Wabi-Sabi

In warm Scandinavian and wabi-sabi interiors, NC-02’s EF grade celebrates the imperfection and natural authenticity that both aesthetics value at their core. The knots, mineral streaks, and colour variation are not flaws to be minimised but features to be appreciated and celebrated. Works with raw plaster walls, warm white painted surfaces, natural linen and undyed cotton, handmade ceramics, and simple wood furniture.

Bold Maximalist & Rich Colour

NC-02’s warm honey-amber EF grade is an outstanding floor partner for maximalist interiors with rich, warm wall colours. Against deep terracotta, warm ochre, forest green, or aged brick, the natural oak creates a warm, organic material ground that is complex enough to hold its own against intense colour. The EF grade’s knots and grain add visual energy that matches the richness of a bold interior palette.

Installation & Room Suitability

Click Installation (Floating)

NC-02 uses Uniclic-compatible click floating installation. No adhesive required. Boards lock together and float over the subfloor on an approved acoustic/thermal underlay.

•No adhesive — click lock floating installation

•Subfloor flatness: 3mm per 2m maximum

•Approved underlay: acoustic/thermal, 3mm maximum

•Expansion gap: minimum 12mm at all walls

•Acclimatisation: 48 hours at room temperature before laying

•Install along the longest room dimension

•Stagger end joints: minimum 300mm between adjacent rows

•Micro-bevel joints: do not fill or caulk

Board selection: lay boards from multiple boxes simultaneously to distribute EF grade colour variation naturally across the floor

Underfloor Heating

NC-02 is compatible with both hydronic and electric UFH. The UV lacquer finish is more moisture-resistant than wax oil or natural oil finishes.

•Maximum surface temperature: 27°C

•Switch off UFH 48 hours before installation

•After installation: increase +1–2°C per day to target

•Maintain indoor humidity: 45–60% RH year-round

•UV lacquer more stable than wax oil under UFH cycling

•Thermal resistance: 0.15 m²K/W maximum

Room Suitability

Room / Application	Suitability	Notes
Farmhouse & Country House Living Rooms	Exceptional	NC-02 is the definitive floor for farmhouse, barn conversion, and country house living rooms. The EF grade knots, mineral streaks, and wild grain read as the authentic material of aged and weathered timber — the quality that reclaimed floors aspire to but cannot guarantee. The 190mm wide format at full EF character creates a living room floor of genuine natural drama and warmth.
Large Living Rooms (open plan)	Exceptional	At 190mm width in EF grade, NC-02 creates a warm, richly characterful ground plane across a large living room or open-plan space. The dramatic colour variation distributes naturally across a large floor area, creating a tonal range that shifts in different lighting conditions throughout the day.
Heritage & Period Properties	Exceptional	NC-02’s EF grade character — with its large knots, mineral streaks, and wild grain — is the engineered equivalent of antique or reclaimed oak flooring. For period properties, barn conversions, and heritage restorations where authenticity of natural character is paramount, NC-02 is the correct specification: engineered stability and click installation with the visual quality of old-growth timber.
Rustic & Natural Aesthetic Interiors	Exceptional	NC-02 is the natural specification for interiors where the design intent is raw material quality, authenticity, and connection to natural materials. Stone walls, lime-washed plaster, rough-sawn timber, natural linen and wool — NC-02’s EF grade character is the floor that belongs in these spaces.
Dining Rooms	Excellent	UV lacquer resists dining spills. EF grade warm honey-amber reads beautifully in warm dining light and candlelight. The 190mm wide boards create a sense of generous, unhurried material quality in a dining room.
Bedrooms	Excellent	EF grade natural oak creates an enveloping, warm bedroom. The natural variation means no two mornings look identical as the light changes across the floor. UV lacquer requires no re-oiling maintenance.
Kitchens (open plan, dry zone）	Very Good	UV lacquer resists kitchen spills effectively. EF grade warm tone very forgiving of everyday kitchen marks. The natural character conceals minor wear better than uniform-grade floors. Suitable for dining and living zones; avoid directly in front of sinks.
Home Offices	Very Good	Natural oak character creates an organic, warm working environment. UV lacquer durable for desk chair use with mat protection.
Bathrooms / Wet Areas	Not Recommended	Not suitable for wet environments.

Care & Maintenance — UV Lacquer on EF Grade Brushed Oak

Task	Method
Daily	Dry sweep or vacuum with a soft brush head along the grain direction. The brushed grain channels collect fine grit; remove before it abrades the UV lacquer surface. The warm honey-amber tone and the natural variation of EF grade are forgiving of everyday dust and marks.
Weekly	Damp mop with a well-wrung cloth and pH-neutral UV lacquer floor cleaner only. No steam mop. No standard household cleaners. No standing water. Mop along the board length direction.
Spills	Wipe immediately with a dry cloth. UV lacquer provides strong resistance to household liquid spills. Do not allow liquids to stand in micro-bevel joints.
Micro-bevel	Do not fill or caulk micro-bevel joints. The uniform V-groove shadow line is an intentional design feature. Vacuum along joint direction to clean.
No re-oiling	UV lacquer requires no periodic re-oiling. The natural oak colour and brushed grain texture remain stable without maintenance oil. Never apply wax, oil, or maintenance oil products to NC-02 — adhesion failure with the UV lacquer will result.
Furniture	Felt pads under all furniture legs. Protective mat under desk chairs. The natural colour range of EF grade means that scratches are less visually uniform than on a single-tone floor, but felt protection is still essential.
EF grade features	The factory-filled knots, mineral streaks, and filled cracks in EF grade boards are sealed under the UV lacquer and do not require special maintenance. Do not attempt to sand or reopen factory-filled features between full professional refinishing cycles.
Never	Steam mop · standing water at joints · wax or oil on UV lacquer · standard household cleaners with ammonia or bleach · abrasive pads · filling micro-bevel joints · attempting to open factory-filled knots or cracks.

Certifications & Factory

Manufactured by AMUER — China Factory

NC-02 is manufactured at AMUER's China factory: 50,000 m², approximately 300 workers, producing engineered hardwood flooring since 1997. The 14/3mm 3-layer construction, 190mm × 1,900mm live sawn EF grade boards, brushed surface treatment, and UV lacquer finish are produced under ISO 9001:2015 certified quality management. Every NC-02 shipment carries:

•CE Marking (EN 13489) — required for all EU market sales

•FSC Chain of Custody — sustainable timber sourcing documentation

•EUDR — EU Deforestation Regulation compliance

•E1 Emission Class — lowest European formaldehyde standard

•ISO 9001:2015 — certified quality management system

FAQ

Q1. What is EF grade oak engineered flooring?

EF grade oak engineered flooring is the maximum natural character specification for European oak flooring. EF grade includes the full spectrum of naturally occurring features without restriction: large open and filled knots from 20mm to 70mm+ in diameter; prominent black and dark-grey mineral streaks running across the board face; filled cracks and checks; bark inclusions; wild swirling grain around knots and branch intersections; and the widest possible colour variation from pale cream sapwood to deep amber heartwood. All features are structurally stable and factory-filled where open. EF grade is not selected for uniformity; it is selected for maximum natural character and drama.

Q2. Are the open knots and cracks in NC-02 structurally stable?

Yes — all open features in NC-02 EF grade boards are factory-filled with colour-matched resin before finishing. The filled knots, mineral streaks, and cracks are structurally stable, sealed under the UV lacquer film, and will not develop further in normal residential use. The UV lacquer provides an additional protective seal over all filled features. Do not attempt to open, sand, or re-fill factory-filled features between professional refinishing cycles.

Q3. What is the difference between EF grade and DE grade oak flooring?

Both EF and DE grades include prominent knots and natural character features. EF grade is the higher specification: it includes larger knots (up to 70mm+ vs 30–40mm typical in DE grade), more prominent and darker mineral streaks, more filled cracks, more wild grain movement, more sapwood inclusion, and a wider colour variation range. DE grade produces a high-character floor with natural drama; EF grade produces a floor at the maximum end of European oak’s natural character range. NC-02 (EF) and NC-01 (DE) in the AMUER range represent these two positions.

Q4. How do I distribute EF grade boards when installing NC-02?

For the most natural and balanced result, open boards from multiple cartons simultaneously when installing NC-02, rather than emptying one carton before opening the next. EF grade has significant colour variation — pale sapwood boards, mid-tone honey boards, and rich amber heartwood boards — and distributing these evenly across the floor produces a natural-looking tonal blend similar to the variation in old-growth or reclaimed timber. Avoid concentrating all pale or all dark boards in one area of the floor.

Q5. Can NC-02 be used over underfloor heating?

Yes — NC-02 is compatible with both hydronic and electric UFH, maximum surface temperature 27°C. The UV lacquer finish is more moisture-resistant than wax oil or natural oil. Maintain indoor humidity at 45–60% RH year-round. Click floating installation accommodates thermal expansion without adhesive constraint. Switch off UFH 48 hours before installation and activate gradually afterward.

Q6. Is EF grade suitable for a contemporary interior or only for rustic styles?

EF grade is most naturally suited to farmhouse, country, heritage, and rustic-natural interior aesthetics where the dramatic natural features read as authentic material quality. However, EF grade can be used in contemporary interiors as a bold material counterpoint — a maximally-natural floor in a spare, minimal room creates a powerful tension between the rawness of the material and the restraint of the design. The key is that EF grade’s drama should be the intentional design choice, not something to be minimised or hidden.

Q7. What is the minimum order for NC-02?

The standard minimum order for AMUER NC-02 is 200 m² per SKU from our China factory. Free samples available — email arboren@arboren.com. Dispatched to EU, Australian, and most international addresses within 4-5 business days.

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Specify NC-01 for Your Next Project

Natural Character Brushed Oak · 190mm Wide Plank · DE Grade · UV Lacquer · Click

14/3mm · 3mm wear layer · 1,900mm length · CE & FSC certified · Factory direct AMUER China · 200 m² MOQ

arboren@arboren.com · www.amuerflooring.com

[ Request a Free Sample ] [ Get a Factory Price Quote ]