The Accuramatic Mk7 is supplied with a range of sizes of high strength silicone tubing, fabricated to suit peristaltic use. We stock this tubing in sizes from 1mm bore to 8mm bore, with a 2mm wall. The Mk7 can also be fitted with a pumphead suitable for 1.6mm wall tubing.
Silicone is suitable for many applications, being resistant to acids, alkalis and temperature extremes, and it has good mechanical properties. Some oils and aromatics are incompatible with silicone, and alternative tubing materials are available (see tables below). Viton can be used in many applications but it is expensive and has a shorter life than silicone, pvc is inexpensive but rather hard and inelastic. Ensure that any tubing used in the pump has been formulated for peristaltic use and is of a suitable wall thickness.
It is always advisable to test tubing for a new product by immersing a piece for 48 hours and testing for absorption/leaching - indicated by a change in weight or elasticity.
The chart below is not exhaustive, and is for guidance only (no liability can be accepted for the details shown).
CHEMICAL RESISTANCE OF TUBING
| + Suitable x Unsuitable = Use only after testing o No data available |
|---|
| Product | Silicone | Viton | Product | Silicone | Viton |
|---|---|---|---|---|---|
| Acetaldehyde | + | x | Acetates (low mol wt) | = | x |
| Acetic acid (<5%) | + | = | Acetic acid (>5%) | x | = |
| Acetic anhydride | = | x | Acetone | + | x |
| Alcohols | + | + | Aliphatic hydrocarbons | = | x |
| Aluminium chloride | + | + | Aluminium sulphate | + | + |
| Alums | + | + | Ammonia | + | x |
| Ammonium chloride | o | = | Ammonium hydroxide | + | + |
| Ammonium phosphate | + | o | Ammonium sulphate | + | + |
| Amyl alcohol | x | + | Amyl chloride | x | + |
| Aniline | = | = | Aniline hydrochloride | x | + |
| Animal oils | = | + | Aromatic hydrocarbons | + | + |
| Arsenic salts | o | + | Barium salts | + | + |
| Benzene | x | + | Benzenesulphonic acid | o | + |
| Benzoic acid | = | + | Benzyl alcohol | = | + |
| Bleaching liquors | = | + | Boric acids | + | + |
| Bromine | x | + | Butane | x | + |
| Butanol | = | + | Calcium salts | + | + |
| Carbon bisulfide | x | + | Carbon dioxide | = | + |
| Carbon tetrachloride | x | + | Chlorobenzene | x | + |
| Chlorine | x | + | Chloroform | x | + |
| Chromatic acid | x | + | Copper salts | + | + |
| Cresol | = | + | Cyclohexanone | x | + |
| Detergent solutions | + | + | Diesel fuel | o | + |
| Dioxane | + | x | Ethyl alcohol | = | + |
| Ethyl bromide | + | o | Ethyl chloride | x | + |
| Ethylene chlorohydrin | x | + | Ethylene dichloride | x | + |
| Ethylene glycol | + | + | Fatty acids | = | + |
| Ferric chloride | = | + | Ferric sulphate | = | + |
| Ferrous chloride | = | + | Ferrous sulphate | = | + |
| Formaldehyde | = | = | Formic acid | = | = |
| Gasoline | x | + | Gelatine | + | + |
| Glucose | + | + | Glycerine | + | + |
| Hexane | x | + | Hydrobromic acid | x | + |
| Hydrochloric acid | x | + | Hydrofluoric acid | x | + |
| Hydrogen peroxide | + | + | Hypochlorous acid | o | + |
| Iodine | o | + | Kerosene | x | + |
| Lactic acid (cold) | + | + | Linseed oil | + | + |
| Magnesium chloride | + | + | Magnesium sulphate | = | + |
| Malic acid | = | + | Manganese salts | + | + |
| Mercury salts | o | = | Naptha | x | + |
| Natural gas | + | + | Nickel salts | + | + |
| Nitric acid (dil) | = | + | Nitric acid (med) | x | + |
| Nitric acid (conc) | x | = | Nitrobenzene | x | + |
| Oils, animal | = | + | Oils, mineral | = | + |
| Oils, vegetable | + | + | Oleic acid | x | = |
| Oxalic acid | = | + | Oxygen gas | + | + |
| Perchloric acid | x | + | Phenol | x | + |
| Phosphoric acid | = | + | Phthalic acid | + | + |
| Plating solutions | x | + | Potassium carbonate | + | + |
| Potassium chlorate | + | + | Potassium hydroxyde | x | + |
| Potassium iodide | = | + | Pyridine | x | x |
| Silver nitrate | + | + | Soap solutions | + | + |
| Sodium bicarbonate | + | + | Sodium bisulphate | + | + |
| Sodium bisulphite | + | + | Sodium borate | + | + |
| Sodium carbonate | + | + | Sodium chlorate | o | + |
| Sodium chloride | + | + | Sodium cyanide | + | + |
| Sodium hydrosulphite | = | + | Sodium hydroxide (dil) | + | + |
| Sodium hypchlorite | + | + | Sodium nitrate | x | o |
| Sodium silicate | + | + | Sodium sulphide | + | + |
| Sodium sulphite | + | + | Stearic acid | = | o |
| Sulphur chloride | x | + | Sulphur dioxide | = | + |
| Sulphur trioxide | = | + | Sulphuric acid | x | + |
| Sulfurous acid | x | + | Tannic acid | = | + |
| Tanning extracts | o | = | Tartaric acid | = | + |
| Tin chlorides | + | + | Toluene | x | + |
| trichloroacetic acid | o | x | trisodium phosphate | o | + |
| Turpentine | x | + | Urea | + | + |
| Uric acid | = | = | Water | + | + |
| Water (brine) | + | + | Xylol | x | + |
| Zinc chloride | o | + |