Eprouvettes graduées en verre ou en plastique pour vos applications de laboratoire. Les eprouvettes graduées et cylindres sont disponibles en forme haute et basse et en taille différentes. Les eprouvettes graduées BLAUBRAND® sont livrés avec un numéro de lot et un certificat de qualité.
Les éprouvettes graduées et les éprouvettes bouchées de BRAND offrent un maximum d'exactitude. Un sévère contrôle statistique garantit le haut degré de qualité. Toutes les éprouvettes graduées BLAUBRAND® sont livrées avec numéro de lot et un certificat de lot inclus par unité d'emballage d'origine. Sur demande, elles sont également livrables avec certificat individuel ou attestation de calibrage DAkkS.
BLAUBRAND®: Marque circulaire aux points principaux. La lecture se fait au point le plus bas du ménisque.
SILBERBRAND: Traits de division. La lecture se fait au point le plus bas du ménisque.
Eprouvettes graduées, plastique
Les éprouvettes graduées de BRAND sont fabriquées à partir de matières plastiques de haute qualité, particulièrement résistantes aux produits chimiques.
La conicité minime de l'éprouvette permet une division régulière de la graduation.
- Forme très stable grâce au bord renforcé
- Bec verseur fonctionnel, absence d'écoulement postérieur
- Stabilité assurée grâce au pied hexagonal à boutons de support.
- Excellente lisibilité des graduations
- Presque incassables.
Eprouvettes graduées, classe A
Les éprouvettes graduées de classe A se distinguent par une très faible variation des valeurs de mesure, comme le montre l’exemple graphique ci-dessus. Les limites d'erreur de la classe A sont obtenues même après 20 lavages et 10 stérilisations à la vapeur. (La norme DIN 12 681 exige: 10 lavages et 3 stérilisations à la vapeur.)
BRD-FAQHEADLINE (Eprouvettes graduées)
What is the advantage of low form graduated cylinders?
Due to the reduced height low form graduated cylinders have an improved stability compared to tall form graduated cylinders. With identical volumes the inner diameter and, subsequently, the error limits of graduated cylinders of low form increase. All graduated cylinders with low form refer to Class B (SILBERBRAND) of DIN EN ISO 4788. Graduated cylinders with tall form can meet error limits of Class A (BLAUBRAND) or Class B (SILBERBRAND).
What is the appropriate handling of mixing cylinders?
Mixing cylinders can be used in the preparation of standard solutions and dilutions, the same as volumetric flasks.
Insert amount of substance or standard solution concentrate, fill mixing cylinder with solvent about half, swirl mixing cylinder to dissolve and mix, fill mixing cylinder with water to just below the ring mark, top up remaining volume until meniscus is excatly at ring mark by using a wash bottle or pipette, close mixing cylinder and shake upside down to mix thouroughly. Carefully remove closure to vent any pressure, taking care to avoid any aerosols that may have been generated.
Are graduated or mixing cylinders calibrated according to 'TC, In' or 'TD, Ex'?
'TC, In': The contained quantity of liquid corresponds exactly to the capacity indicated on the instrument.
What kind of screening inks does BRAND use for printing the graduated or mixing cylinders?
Blue and white enamel are printed on the outer surface and provide a high contrast and an optimal combination of chemical resistance and legibility for BLAUBRAND (cl. A) and SILBERBRAND (cl. B) graduated or mixing cylinder.
Amber diffusion stain is used for BLAUBRAND®-ETERNA (cl. A) and SILBERBRAND-ETERNA (cl. B) graduated or mixing cylinder. This color diffuses into the glass surface and can therefore only be removed by abrasion or glass corrosion.
What are BLAUBRAND® and SILBERBRAND volumetric flasks labeled with?
Every BLAUBRAND® and SILBERBRAND graduated or mixing cylinder is labeled with nominal capacity, unit symbol (ml), error limit (± _ ml), calibration temperature (20 °C), calibration type (In), Class (A or B), country of origin (Germany), manufacturer's trademark (BLAUBRAND or SILBERBRAND) or company's name or logo (BRAND) as well as the type of glass (Boro 3.3), the standard referring to (ISO or ISO 4788) and inscription ETERNA (if applicable). Every BLAUBRAND® graduated or mixing cylinder is labeled additionally with DE-M marking and batch or serial number as well as in case of USP volumetric flasks the inscription USP.
What are BLAUBRAND® and SILBERBRAND volumetric flasks labeled with?
Every BLAUBRAND® and SILBERBRAND graduated or mixing cylinder is labeled with nominal capacity, unit symbol (ml), error limit (± _ ml), calibration temperature (20 °C), calibration type (In), Class (A or B), country of origin (Germany), manufacturer's trademark (BLAUBRAND or SILBERBRAND) or company's name or logo (BRAND) as well as the type of glass (Boro 3.3), the standard referring to (ISO or ISO 4788) and inscription ETERNA (if applicable). Every BLAUBRAND® graduated or mixing cylinder is labeled additionally with DE-M marking and batch or serial number as well as in case of USP volumetric flasks the inscription USP.
What has to be taken into account when two liquids are mixed?
When two liquids are mixed, a volume change may occur due to the change of properties of the mixture in comparison to the individual liquids.
What is the appropriate handling of graduated cylinders?
Handling of graduated cylinders:
Fill with liquid.
Set meniscus to required mark and be sure that the wall of the cylinder is not wetted above the mark.
The indicated volume is the amount of liquid contained.
What is the difference between Class A and Class B?
Class A stands for highest quality grade volumetric flasks in accordance to DIN EN ISO 1042 and, therefore, for tight error limits (BLAUBRAND®).
Class B volumetric flasks (SILBERBRAND) have larger error limits than Class A volumetric flasks, usually twice as much.
Éprouvettes graduées, forme haute, BLAUBRAND® ETERNA, classe A, Boro 3.3, DE-M
