EVA発泡材シート技術ガイド：密度、硬度、品質の理解
Whether you are an engineer designing shock-absorbing industrial pads, a footwear manufacturer looking for the perfect midsole, or a creative professional building intricate props, the success of your project hinges on one thing: selecting the right material. At Damao Tech, we understand that not all foam is created equal.
In this comprehensive guide, we dive deep into the technical specifications of EVA foam sheets, helping you navigate the complexities of density, hardness, and durability to ensure you get the exact performance your project demands.
エチレンとビニルアセテートの共重合体から作られた閉孔材です。ゴムのエラストiciティとプラスチックの堅牢性を組み合わせて、非常に多様なオプションとなります。EVAフォームは、優れた柔軟性、弾性、防水性、および化学安定性で知られており、これらすべてがゴムシートや密封材の適用に特に適しています。
Ethylene-Vinyl Acetate (EVA) is a closed-cell copolymer foam known for its exceptional versatility. It bridges the gap between soft rubber and rigid plastics, offering a unique balance of durability, flexibility, and water resistance. However, to truly unlock its potential, you must understand the two critical metrics that define its character: Density 熱可塑性ポリウレタン（TPU）です。 硬度.
Understanding EVA Density: The Core of Durability
Density is defined as the mass of the foam per unit of volume, typically measured in kilograms per cubic meter ( kg/m ³). It is the single most important factor regarding the longevity and resilience of the material.
Why “Ultra High Density” Matters
While standard EVA foam is excellent for lightweight cushioning, ultra high density EVA foam sheets represent the pinnacle of durability. Ranging from 150 kg/m ³ to 280 kg/m ³, these high-density sheets are engineered to withstand rigorous stress without collapsing.
- Compression Resistance: Lower density foams may permanently flatten (bottom out) under heavy loads. Ultra high density options bounce back, maintaining their thickness and cushioning properties over years of use.
- Surface Finish: Higher density results in a smoother, finer cell structure. This is vital for applications requiring a pristine aesthetic or precise machining, such as laser cutting or CNC routing.
- Water & Chemical Resistance: A denser cell structure provides a superior barrier against moisture and mild chemicals, making it ideal for marine decking or industrial gaskets.
At Damao Tech, we offer a wide range of densities, recommending high-density grades for heavy-duty applications where failure is not an option.
The Hardness Spectrum: Finding the Right Balance
While density measures weight, hardness measures the material’s resistance to indentation. In the EVA industry, this is measured on the Shore A durometer scale. This spectrum typically ranges from 15 (very soft) to 80 (very hard).
Choosing the correct hardness is critical for the feel and function of your product:
1. Soft / Low Hardness (Shore A 25–35)
- 感覚： Similar to a soft gel insert or a plush yoga mat.
- OEM： Ideal for interior padding, helmet liners, therapeutic insoles, and costume comfort layers. It prioritizes comfort and flexibility over structural support.
2. Standard / Medium Hardness (Shore A 38–45)
- 感覚： Firm but flexible, similar to a standard exercise mat or flip-flop sole.
- OEM： This is the industry standard for most general-purpose applications. It offers the perfect balance between cushioning and durability, widely used in packaging inserts, gym mats, and toys.
3. Rigid / High Hardness (Shore A 60–75+)
- 感覚： Hard and tough, similar to a car tire or a shoe heel.
- OEM： Designed for outsoles, automotive protective bumpers, heavy-machinery vibration pads, and structural elements. It resists abrasion and holds its shape under pressure.
Customization at Damao Tech: Do you need a specific hardness, such as Shore A 55? We can customize the formulation to meet your precise technical requirements.
EVA Foam Sheets Product Info and Reviews: How to Spot Quality
When searching for eva foam sheets product info and reviews online, it can be difficult to separate marketing claims from technical reality. As industry experts, we advise looking for specific indicators of quality that we prioritize in our manufacturing process:
- Cell Uniformity: Cut a cross-section of the sheet. High-quality EVA should have uniform bubbles (cells) visible to the naked eye. Inconsistent cell sizes lead to weak spots and uneven tearing.
- Color Consistency: Professional-grade sheets should have a consistent color throughout the entire thickness, not just on the surface.
- Low Odor: Excessive chemical smell often indicates low-quality processing or residual solvents. Premium EVA foam sheets from Damao Tech are processed to minimize odor, making them safer for indoor use and consumer products.
Why Damao Tech? The Importance of Material Expertise
In the world of material supply, trust is built on consistency and technical knowledge. Damao Tech prides itself on adhering to the highest standards of quality and reliability.
- Proven Experience: Our team doesn’t just sell foam; we understand the chemical composition and mechanical properties of every sheet we produce.
- Industry Authority: We supply industries ranging from marine to medical, meaning our materials are tested in some of the harshest environments.
- Unwavering Trust: We provide transparent data sheets and honest recommendations. If a standard Shore A 38 foam works for your prototype, we will tell you. When you source EVA foam sheets from us, you are getting material capable of meeting your exact lifespan requirements.
FAQ: EVAフロムに関するよくある質問
Q1: EVAフロムの最も一般的な硬度は何ですか？
最も汎用性が高く一般的な硬度はショアA 38から45の範囲です。この範囲は、多くのアプリケーションに適した缓冲としっかり感の良いバランスを提供します。.
Q2: 超高密度EVAフロムを熱成形できますか？
はい！低密度フォームよりも少し高い温度が必要ですが、超高密度EVAは熱成形後も非常に良い形状を保ちます。複雑な形状に最適です。.
Q3: EVAフォームは防水ですか？
はい、もちろんです。EVAは閉孔構造のフォームであり、スライムのように水を吸収しません。自然にカビ、コケ、腐食に耐えます。.
Q4: 高密度EVAフォームシートはどう切りますか？
5mmまでのシートには鋭いユーティリティナイフが適しています。厚いまたは硬度が高いシート（Shore A 60以上）には、きれいなプロフェッショナルなエッジを得るためにビンドーサーやレーザーカッターを使用することをお勧めします。.
プロジェクトを開始する準備ができましたか？
正しい素材を選ぶことは、成功する製品への第一歩です。Shore A 30の柔らかい快適さ、標準のShore A 40の多様性、または超高密度フォームの丈夫な耐久性が必要な場合でも、Damao Techはお客様に値する精度と品質を提供します。.
今日すぐに連絡してください。 見積もりを依頼したり、私たちの素材専門家とお話しするには、お問い合わせください。一緒に丈夫なものを作りましょう。.
