---
title: "Woodworking Engineering & B2B Knowledge Hub | KONAR"
description: "Industrial joinery insights: hardwood mechanics (EN 16139), marine D4 bonding (EN 204), High-Gloss mirror finishing, and OEM CNC tolerances."
locale: en
canonical: https://konar-meble.pl/en/blog/
url: https://konar-meble.pl/en/blog/
publishedAt: 2026-06-01
modifiedAt: 2026-08-18
alternates:
  en: https://konar-meble.pl/en/blog/
  pl: https://konar-meble.pl/pl/baza-wiedzy/
  nl: https://konar-meble.pl/nl/kennisbank/
  de: https://konar-meble.pl/de/wissen/
  fr: https://konar-meble.pl/fr/blog/
  da: https://konar-meble.pl/da/viden/
  sv: https://konar-meble.pl/sv/kunskapsbank/
---
# Woodworking Engineering & B2B Knowledge Hub | KONAR

> Industrial joinery insights: hardwood mechanics (EN 16139), marine D4 bonding (EN 204), High-Gloss mirror finishing, and OEM CNC tolerances.

## Published Engineering Articles

### [Beech vs Oak: Wood Strength for Contract Chair Frames under EN 16139](https://konar-meble.pl/en/blog/beech-vs-oak-contract-chair-frames-en-16139/)
- **Category:** Contract Furniture & HoReCa | **Published:** 2026-06-15 | **Author:** Jarosław Milewczyk
- **Norms:** PN-EN 16139, PN-EN 204, PN-EN 13183-1

Structural and mechanical analysis of European beech (Fagus sylvatica) and oak (Quercus robur) regarding bending strength, shrinkage anisotropy, and mortise-and-tenon joint durability in public spaces.

*[Read HTML Article](https://konar-meble.pl/en/blog/beech-vs-oak-contract-chair-frames-en-16139/) · [Direct Markdown](https://konar-meble.pl/md/en/blog/beech-vs-oak-contract-chair-frames-en-16139.md)*

### [D4 Adhesives (EN 204) and High-Gloss Lacquering in Marine & Yacht Furniture](https://konar-meble.pl/en/blog/d4-adhesives-high-gloss-finishing-marine-yacht-en-204/)
- **Category:** Marine & Yacht Interiors | **Published:** 2026-07-22 | **Author:** Jarosław Milewczyk
- **Norms:** PN-EN 204, WATT 91, IMO FTP Code Part 2/5

Comprehensive study of marine woodworking chemistry and finishing: 1K/2K PUR adhesives, marine plywood bonding, High-Gloss mirror polishing, and IMO FTP Code standards.

*[Read HTML Article](https://konar-meble.pl/en/blog/d4-adhesives-high-gloss-finishing-marine-yacht-en-204/) · [Direct Markdown](https://konar-meble.pl/md/en/blog/d4-adhesives-high-gloss-finishing-marine-yacht-en-204.md)*

### [CNC Tolerances (±0.1 mm), Moisture Balance (8–10%) and NDA in Serial B2B OEM Joinery](https://konar-meble.pl/en/blog/cnc-tolerances-moisture-balance-nda-oem-joinery-b2b/)
- **Category:** OEM & Contract Manufacturing | **Published:** 2026-08-17 | **Author:** Jarosław Milewczyk
- **Norms:** ISO 2768-m, PN-EN 13183-1, DIN 68871

Engineering handbook for European furniture brands: CNC mortise-tenon machining fits, batch quality control protocols, RAL/NCS lacquering, and pan-European logistics.

*[Read HTML Article](https://konar-meble.pl/en/blog/cnc-tolerances-moisture-balance-nda-oem-joinery-b2b/) · [Direct Markdown](https://konar-meble.pl/md/en/blog/cnc-tolerances-moisture-balance-nda-oem-joinery-b2b.md)*