H. & K. Starke GmbH is a distinguished German manufacturer specializing in the production of high-precision laboratory glassware and specialized apparatus for sample preparation. Based in Schwäbisch Hall, Germany, the company has established itself as a premier authority in the fabrication of technical glass instruments that meet stringent international testing standards. Their mission is centered on providing "Precision in Glass," ensuring that every instrument—from specialized centrifuge tubes to complex distillation components—offers the structural integrity and measurement accuracy required for sensitive analytical work. H. & K. Starke is particularly renowned for its expertise in manufacturing glassware that complies with specific ASTM, DIN, and ISO protocols, making them a vital partner for laboratories in the petrochemical, environmental, and wastewater treatment sectors who require validated hardware for regulatory compliance.
The H. & K. Starke range at LabFriend features professional distillation, separation, and filtration solutions, headlined by their high-performance ASTM centrifuge tubes. Available in cylindrical, pear-shaped, and conical designs, these tubes are manufactured from premium borosilicate glass 3.3 to withstand high centrifugal forces and chemical stress. For environmental monitoring, the brand provides advanced environmental analysis tools, including the industry-standard Winkler-type oxygen bottles and Duran Imhoff sedimentation cones for water quality testing. Their portfolio also includes specialized analytical measurement aids such as overflow measuring flasks and precision weighing scoops. To support industrial workflows, Starke offers glassware designed specifically for oil and fuel analysis according to ASTM D96 and D91 standards. By choosing H. & K. Starke through LabFriend, you benefit from competitive pricing and fast shipping on German-engineered glassware designed for analytical precision and safety.
Why Choose H. & K. Starke for Your Laboratory?
- ASTM Standard Compliance: Their specialized centrifuge tubes are manufactured to exact ASTM specifications, ensuring they fit standard rotors and meet the strict requirements of petroleum and chemical testing.
- High-Grade Borosilicate 3.3: Utilizes premium glass with a low coefficient of thermal expansion, providing excellent resistance to thermal shock and aggressive chemical reagents.
- Specialists in Water Analysis: Offers the definitive equipment for sedimentation and dissolved oxygen testing, trusted by municipal and industrial wastewater laboratories worldwide.
- Durable & Permanent Markings: Features high-contrast blue or white enamel graduations that are fired onto the glass, ensuring long-term legibility even after repeated cleaning and autoclaving.
- German Engineering Heritage: Combines traditional glassblowing craftsmanship with modern manufacturing technology to produce instruments with superior wall thickness and durability.
Frequently Asked Questions
1. What is the maximum RCF for H. & K. Starke ASTM centrifuge tubes?
Standard H. & K. Starke ASTM centrifuge tubes (100 mL) are generally resilient up to 700 x g RCF, depending on the specific model and rotor fitment.
2. Why is the Winkler-type bottle used for oxygen determination?
The Winkler bottle is specifically designed with a precision-ground glass stopper to prevent air bubbles from being trapped, ensuring that the dissolved oxygen measurement in water samples is not skewed by atmospheric oxygen.
3. Are the Imhoff sedimentation cones available with stopcocks?
Yes, H. & K. Starke provides Imhoff cones in both "without stopcock" designs for standard sedimentation and "with stopcock" models for easier drainage of settled solids.
4. Can I use H. & K. Starke glassware in a muffle furnace?
While borosilicate 3.3 is highly heat-resistant (typically up to 500°C for short periods), it is not intended for the extreme temperatures of a muffle furnace. For such applications, quartz or porcelain labware is recommended.
