The SHM/STAND has been purpose built to hold the Stuart® homogenisers, it couples directly to the SHM3 and attaches to the SHM1 clamp holder, included with SHM1.
The stand is heavy duty to remain stable during use and comes with a rubber coated base to help stabilise samples during processing.
BioCote anti-microbial coating additive is present on all Stuart brand equipment and offers anti-microbial action to help prevent cross-contamination.
This unique additive is applied during the manufacturing process and contains trace levels of active silver ions which provide an effective anti-microbial action, active against many strains of common bacteria and fungi, including Aspergillus niger, E.coli and Listeria mono.
This coating remains active for the entire product lifespan and can actually help in prolonging the life of products, where a build up of microbes may cause premature material degradation.
BioCote works by inhibiting bacteria in a number of ways including protein damage, cell membrane damage, oxidative damage and DNA interference. Ultimately, the bacteria are prevented from replicating. Without this, bacteria have been shown to die naturally within around 8 hours. BioCote works in a way different to antibiotics so it is currently effective against antibiotic resistant strains.
More recently, BioCote technology was proven effective against particular virus strains, with a reduction of 90% in 2 hours against feline coronavirus, strain Munich. Read more here.
When selecting filter paper, these parameters should be taken into consideration.
|Ash content/residue on ignition||The ash content is determined in accordance with DIN 54370. To obtain this 10 g filter paper is weighed before and after ignition in a platinum crucible at 800 °C. The results are expressed as % of original paper weight.|
|Dry bursting strength||For determination of the dry bursting strength the paper is clamped over a rubber diaphragm with
an area of 10 cm2. The strain on the paper is then increased by applying an increasing air pressure,
until the paper bursts. The dry bursting strength in accordance with DIN 53113 is stated in KPa.
|Tensile strength||For determination of the tensile strength, a paper strip (measuring 180 x 15 mm) is subjected to vertical strain by applying increasing weight. The force expended at the moment of tearing represents
the tensile strength. Results are expressed in N/15 mm.
|Thickness||The thickness of a paper is measured with a touch pressure device. Especially for soft and creped
papers it is important that the touch pressure is not too high. Otherwise, the papers are compressed
and a falsely low thickness is obtained.
|Filtration speed||For determination of the filtration speed in accordance with DIN 53137 the duration of flow of 10 mL distilled water through a quadrant-folded, freely suspended filter circle of 12.5 cm diameter is measured. Results are expressed in seconds.|
|Basis weight||The basis weight is determined for a sample of 10 x 10 cm. It is measured in g/m2.|
|Gurley test||The Gurley test measures the time required for filtration of 100 mL air at a water column pressure of 31 mm. The sample has an area of ¼ sq. inch.|
|Wet strength||The wet strength of a paper is a measure for the mechanical stability of a paper in a wet or moist condition. For example, it can be determined as the tensile strength or the bursting strength (see above).|
The retention efficiency of a filter paper is influenced by several factors. Since filter papers are deep bed filters, one usually refers to a mean particle retention.
|Capillary rise according to Klemm||The capillary rise according to Klemm indicates how far a strip of filter paper is moistened in 10 min when vertically dipped with one end into distilled water (20 °C).|
|Particle retention||Particle retention refers to the efficiency of filter papers in retaining certain precipitates. It is characterized by the permeability of the paper for precipitates of iron(III) oxyhydrate, lead sulfate, calcium oxalate and barium sulfate.|