膩子粉市場魚龍混雜，價格從十幾塊到幾十塊一袋不等。便宜的未必差，貴的未必好——關鍵看你會不會挑。以下4招，幫你避開劣質膩子的坑。

The putty powder market is a mix of good and bad, with prices ranging from tens to tens of yuan per bag. Cheap may not be bad, expensive may not be good - it depends on whether you can choose. Here are 4 tips to help you avoid the pitfalls of inferior putty.

第一招：看包裝——合格證和標準號是第一道門檻。 選購時先看包裝上的生產標準、合格證、廠址、生產日期是否齊全。環保標準要看 GB 18582-2020（《建筑用墻面涂料中有害物質限量》），這個標準對甲醛、VOC等有害物做了嚴格限制，要求每公斤VOC含量≤10g。性能標準看 JG/T 298-2010（室內用膩子）或 JG/T 157-2009（外墻用膩子）。沒有這些標準號的，直接pass。

The first trick: Look at the packaging - the certificate of conformity and standard number are the first threshold. When making a purchase, first check whether the production standards, certificate of conformity, factory address, and production date on the packaging are complete. The environmental standards should refer to GB 18582-2020 (Limits of Hazardous Substances in Building Wall Coatings), which strictly limits harmful substances such as formaldehyde and VOC, requiring a VOC content of ≤ 10g per kilogram. The performance standards can be found in JG/T 298-2010 (Putty for Indoor Use) or JG/T 157-2009 (Putty for External Walls). Without these standard numbers, just pass.

第二招：用手捏——一捏就散的肯定不行。 好的膩子粉手感細膩、粘性大。用手捏一捏，如果一捏就散開，說明粘結力差，質量很一般。質量好的膩子粉是由合理的材料配比、機械化方式生產出來的，粘結力強、耐候性好。劣質膩子通常只是把單一組分膠粉與雙飛粉簡單混合而成。

Second move: Pinch with your hands - it definitely won't break apart with just one pinch. Good putty powder has a delicate touch and high viscosity. Pinch it with your hand, and if it spreads out immediately, it indicates poor adhesion and mediocre quality. Good quality putty powder is produced by reasonable material ratios and mechanized methods, with strong adhesion and good weather resistance. Poor quality putty is usually made by simply mixing a single component rubber powder with double fly powder.

第三招：試和易性——用灰刀鏟一下就知道。 用灰刀鏟一些調好的膩子，反過來拿，如果很快就掉下來，說明粘性小、質量差。好的膩子粘性大，不易掉落。另外注意觀察：發散、有針孔的膩子質量差。

The third move: trial and easy - just use a gray knife to shovel and you'll know. Scrape some pre mixed putty with a gray knife and take it in reverse. If it falls off quickly, it indicates low viscosity and poor quality. Good putty has high viscosity and is not easy to fall off. Also, pay attention to observation: the quality of putty with divergence and pinholes is poor.

第四招：看防偽——品牌膩子通常有防偽標識。 品牌膩子粉廠家一般防偽意識較強，包裝上會有防偽標識或查詢碼。刮開涂層查真偽，是辨別正品和山寨貨的有效手段。

The fourth trick: Look for anti-counterfeiting - Brand putty usually has anti-counterfeiting labels. Brand putty powder manufacturers generally have a strong awareness of anti-counterfeiting, and there will be anti-counterfeiting labels or query codes on the packaging. Scratching off the coating to check authenticity is an effective means of distinguishing between genuine and counterfeit products.

補充一點：膩子粉不是越白越好，過分追求白度可能添加了有害增白劑。正常的優良膩子應該是自然的白色，白度在90以上就算合格。選膩子，安全第一、性能第二、價格第三。

Additional point: Putty powder is not necessarily the whiter the better, excessive pursuit of whiteness may add harmful whitening agents. Normal high-quality putty should be naturally white, and a whiteness of 90 or above is considered qualified. Choose putty, safety first, performance second, and price third.

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