Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
おすすめの製品
詳細
Expansion Ratio (X:1): 270 to 325
品質水準
フォーム
flakes
粒径
+50 mesh (>300μ, ≥75% minimum)
pH
5-10
溶解性
water: insoluble
関連するカテゴリー
詳細
迅速な温度上昇に暴露した場合、これらのインターカレーション化合物は気体生成物に分解し、グラフェン層間の圧を高めます。この圧は、黒鉛の基底面を「c」軸方向に押し分けるのに十分な力となります。その結果、黒鉛の容量は最大で300倍まで上昇し、バルク密度が低下し、表面積が約10倍上昇します。
アプリケーション
- グラフェン前駆体。
- 無機炭素源。
- 充填剤。
- 熱添加剤。
- 消火剤。
- 鋳造用粉末。
- プラスチック添加剤。
- ゴム添加剤。
- EMF吸収材。
- 製粉およびふるい
- バルクでの積み下ろし。
- ガスケットおよびシール用基材。
- コーティング。
シグナルワード
Warning
危険有害性情報
危険有害性の分類
STOT RE 2 Inhalation
ターゲットの組織
Lungs
保管分類コード
13 - Non Combustible Solids
WGK
WGK 1
引火点(°F)
Not applicable
引火点(℃)
Not applicable
適用法令
試験研究用途を考慮した関連法令を主に挙げております。化学物質以外については、一部の情報のみ提供しています。 製品を安全かつ合法的に使用することは、使用者の義務です。最新情報により修正される場合があります。WEBの反映には時間を要することがあるため、適宜SDSをご参照ください。
労働安全衛生法名称等を表示すべき危険物及び有害物
名称等を表示すべき危険物及び有害物
労働安全衛生法名称等を通知すべき危険物及び有害物
名称等を通知すべき危険物及び有害物
Jan Code
808121-VAR:
808121-BULK:
808121-2.5KG:
この製品を見ている人はこちらもチェック
-
How is shipping temperature determined? And how is it related to the product storage temperature?
1 回答-
役に立ちましたか？
-
-
How can I determine the shelf life / expiration / retest date of this product?
1 回答-
If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf役に立ちましたか？
-
-
Can you tell me the specific surface area and pore volume of this product expandable graphite, available on your website ?
1 回答-
The surface area and pore size are not determined for this product.
役に立ちましたか？
-
-
What is the size of 808121 Sigma-Aldrich Expandable Graphite product?
1 回答-
This particle size specification for this product is a minimum of 75% at +50 mesh / 300 um or larger, with the remainder being less than 250 um. The value is lot specific and reported on the product Certificate of analysis. Please see the link below to review a sample or lot specific Certificate:
https://www.sigmaaldrich.com/product/aldrich/808121#product-documentation役に立ちましたか？
-
-
Has the graphite (808121) already undergone expansion through a heating process, or is it necessary to expand the graphite by heating? If heating is required, what kind of heating process should be used?
1 回答-
The material in question is considered either Expandable Graphite or Intercalated Graphite. It is sold in its flake form and has not been expanded into worms, which is the industry standard verbiage for expanded graphite.
There are various methods available for the expansion of this material, but certain questions need to be addressed before providing the most suitable approach. For instance, 1 gram of this material will expand to 270 – 325 ml in volume, and the rate and volume of expansion depend on the change in temperature, also known as the “Delta T”. The material will achieve its maximum expansion with a fast thermal shock.
The most widely used method for small quantities involves placing a small amount of material on a piece of Graphite Foil and putting that foil in a furnace heated to at least 950°C (about 1750°F). The higher the temperature, the better. Once the expansion visibly stops, the material should be removed from the furnace and allowed to cool. It is important to note that leaving the material in the furnace for an extended period increases the risk of starting an oxidation reaction. However, this procedure releases acidic gases and should only be performed under a fume hood.
There have been reports of people expanding this material in a microwave, although this method is often incomplete and may result in unexpanded pieces in the product.
If a large amount (production size amounts) needs to be expanded, the use of a larger furnace and some form of air scrubber, typically some type of caustic soda, is necessary to neutralize the off gas.役に立ちましたか？
-
-
How long do you need to heat the expandable graphite at the onset expansion temp? Is there a disadvantage to heating it for a long period?
1 回答-
The most widely used method for small quantities is placing a small amount of material on a piece of graphite foil and putting that foil in a furnace heated to at least 950 C (about 1750 F). The higher the temperature the better.
Once you visibly see the expansion stop, pull that material out of the furnace and allow to cool. There is no specific amount of time recommended. The longer you leave this material in the furnace the better chance you have of starting an oxidation reaction. Be aware, that this procedure causes acidic gasses to be released and advised to only be performed under a fume hood.役に立ちましたか？
-
-
What is the onset expansion temperature of this product
1 回答-
The most widely used method to check expansion for a small amount of 808121 is placing it on a piece of Graphite Foil and putting that foil in a furnace heated to at least 950 °C (about 1750 °F). The higher the temperature the better. So the onset expansion temp could be 950 °C.
役に立ちましたか？
-
アクティブなフィルタ
ライフサイエンス、有機合成、材料科学、クロマトグラフィー、分析など、あらゆる分野の研究に経験のあるメンバーがおります。.
製品に関するお問い合わせはこちら（テクニカルサービス）
