裝修後甲醛從何而來?香港單位釋放年期參考
新裝單位完工後,甲醛主要來自三大源頭:人造板材(密度板、刨花板)、油漆塗料、以及黏合劑。世衛將甲醛列為一級致癌物,長期吸入低濃度可引致呼吸道問題、皮膚過敏、甚至白血病風險上升。最令人頭痛嘅係,甲醛釋放期長達 3 至 15 年,並非「住三個月就無事」。香港夏天潮濕悶熱,氣溫每升 8°C,甲醛揮發速度加倍,所以 5 至 9 月入伙嘅業主一定要做足除醛功夫。AC 設計師喺報價階段已會提醒客戶,與其裝修後狂噴除甲醛劑,不如喺室內設計流程嘅選材步驟揀低甲醛物料,事半功倍。
光觸媒|原理、效用與香港實價
光觸媒核心成份係二氧化鈦(TiO₂),需要紫外線或藍光激發,將甲醛分解為水同二氧化碳。市面常見產品分兩種:
- 噴塗式光觸媒:師傅持槍均勻噴灑於櫃內、牆面、地板,香港收費約 HK$15-25/呎,500 呎單位約 HK$8,000-12,500
- 納米光觸媒塗層:適合冷氣濾網、窗簾,套裝價約 HK$1,200-2,500
光觸媒最大限制係要有光,深櫃底、抽屜內、床下底等暗位效果大打折扣。揀供應商時務必查證 SGS 或 CMA 檢測報告,市面有不少劣質產品純粹噴清水兼香精,毫無分解能力。
活性碳|被高估的「除醛神器」
活性碳係物理吸附,並無化學分解能力,飽和後反而會「回吐」釋放污染物。香港夏天高溫加速飽和,建議 每 2 至 4 星期日曬翻新一次,或者直接更換。椰殼活性碳每包(500g)約 HK$50-120,新裝 400 呎單位起碼擺 8-12 包先有可感效果。活性碳適合作為通風期間嘅輔助手段,唔好當主力武器。揀產品時注意碘值(≥800 mg/g 為佳)、灰份(<10%)兩大指標。
通風才是王道|香港小單位實戰三招
所有除醛專家共識:持續通風係性價比最高嘅方法。理論上開窗 6 至 8 個月、每日 12 小時以上就能令甲醛降至安全水平(<0.08 mg/m³)。但香港夏天打風落雨、冬天冷風刺骨、外牆灰塵噪音都係阻力。AC 設計師推薦三招實戰:
- 新風系統:壁掛式 HK$8,000-15,000,全屋管道式 HK$25,000-50,000,可全天候換氣兼過濾 PM2.5
- 抽氣扇強排:浴室、廚房抽氣扇 24 小時開,配合對流窗形成負壓,慳錢有效
- 工業大風扇:入伙前 1 個月每日吹 8 小時,配合 28°C 暖氣加熱地板櫃身,加速甲醛揮發再排走
如果單位有開放式廚房玻璃門或者趟摺門設計,亦有助形成空氣對流路徑,係除醛通風嘅暗藏優勢。
AC 設計師源頭減量 5 大重點
除甲醛最高招係「冇得釋放」。AC Design 喺全屋裝修服務會堅持以下標準:
- 板材揀 E0 級或無醛級:愛格、克諾斯邦、大亞均有 NAF 認證系列,比普通 E1 板貴 30-50%,每呎只升 HK$80-150
- 油漆揀水性低 VOC:Dulux Forest Breath、Nippon Spotless 系列,HK$650-1,200 一加侖
- 地板優先石材或實木:詳見地板 vs 地磚對比,盡量避免複合木地板嘅基層膠水
- 訂造傢俬封邊到位:四邊全封 PVC 條,唔好留板邊裸露
- 窗簾、梳化選 OEKO-TEX 認證布料
實際操作中,AC 設計師建議「源頭減量 70% + 通風 20% + 光觸媒 10%」嘅黃金組合。完工後仲會建議客戶空置通風最少 6 星期,孕婦及嬰幼兒家庭延長至 3 個月。詳細裝修工期同收費規劃,可參考完整對照表。
實戰案例|BB 家庭健康屋方案
近期 AC 完成嘅寶琳慧安園 B 室現代簡約案例,業主家有初生 BB,全屋採用 E0 板材 + 水性漆 + SPC 地板組合,加裝壁掛新風系統,入伙前實測甲醛 0.05 mg/m³,遠低於國標 0.08 mg/m³。如果你都諗緊新居除甲醛方案,歡迎瀏覽過往住宅作品集或者直接聯絡我哋傾傾方案。
免費諮詢服務|AC Design 提供裝修方案諮詢、低甲醛物料推薦、預算評估。致電 5222 1129 或 WhatsApp 查詢,亦可線上聯絡我哋。
English Summary: Post-Renovation Formaldehyde Removal in Hong Kong (2026)
Formaldehyde released from particle boards, paint, and adhesives can off-gas for 3–15 years, posing serious health risks especially during Hong Kong’s hot, humid summers when emission rates double with every 8°C rise in temperature. This guide compares three mainstream removal approaches with real Hong Kong market pricing.
Photocatalysts (TiO₂) chemically break down formaldehyde into water and CO₂ under UV or blue light. Professional spray service costs HK$15–25 per sqft (HK$8,000–12,500 for a 500 sqft flat). The catch: it only works in lit areas, leaving deep cabinets and under-bed zones largely untreated. Always demand SGS or CMA test reports — many cheap “photocatalyst” products are little more than scented water.
Activated carbon is over-marketed. It only physically adsorbs pollutants and will re-release them once saturated. Hong Kong’s heat accelerates saturation; bags need sun-renewal every 2–4 weeks. Use as a supplement, not a primary defense. Look for iodine value ≥ 800 mg/g and ash content under 10%.
Ventilation remains the gold standard. 6–8 months of 12-hour daily airing can reduce formaldehyde below the 0.08 mg/m³ safety threshold. For Hong Kong’s small flats and weather constraints, AC Design recommends wall-mounted ERV/HRV fresh-air units (HK$8,000–15,000), 24-hour bathroom and kitchen exhaust fans, or industrial fans with 28°C heating before move-in.
AC Design’s golden formula: 70% source reduction + 20% ventilation + 10% photocatalyst. We insist on E0 or NAF-certified boards (Egger, Kronospan, Dare), water-based low-VOC paints (Dulux Forest Breath, Nippon Spotless), stone or solid-wood flooring, full PVC edge banding on custom furniture, and OEKO-TEX certified fabrics. New homeowners should leave units empty and ventilated for at least 6 weeks, extended to 3 months for families with infants or pregnant members.
For a free consultation on low-formaldehyde material specifications and ventilation system planning, call 5222 1129 or WhatsApp us anytime.