Through the use of different shapes, colors, and markings, KemKey™ couplings, when used with an acceptable safety processes, will make the chance of chemical cross-contamination during transfers virtually impossible.
Scope
KemKey™ couplings are shaped so that each class of hazardous chemicals has its own shape.
- Acids – hexagon
- Bases – square
- Reducing agents – heptagon (7 sides)
- Oxidizers – pentagon
- Poisons (biocides, herbicides, pesticides, etc.)– nonagons (9 sided);
- Non-hazardous – oval
KemKey™ couplings have specific colors so that every class of chemical will have its own color.
- Acids – orange or red
- Bases – blue
- Oxidizers – yellow
- Poisons – purple
- Reducers – green
- Non-hazardous – teal
KemKey™ coupling have markings on both the male and female ends that say exactly what the particular fitting is designed to transfer.
KemKey™ will work with each customer to verify that an acceptable safety process is in place to make sure the entire process is as safe as possible.
KemKey™ coupling are shipped with the most correct seal as is possible for the class of chemical known to KemKey™ to make sure there are no questions about the seal compatibility.
Uses
Virtually all water-soluble chemicals as well as some specialty chemicals.
All chemicals that pass through a PVDF KemKey™ fitting should be compatible with PVDF. It is the users responsibility to verify that the fitting is acceptable for the chemical being transferred.
KemKey™ fittings are made of polypropylene or PVDF (Kynar) with 30% fiberglass. When customers are verifying chemical compatibility please refer to polypropylene or PVDF compatibility. Current available sizes are 1” and 2” NPT female thread fittings.(See second page for PVDF properties).
Pressures
Polypropylene
KemKey™ fittings produced from 30% fiberglass filled propylene are designed to meet or exceed all specifications of standard cam-locking fittings. Therefore, it is recommended that you never exceed 125 psi on the fittings.
Maximum pressure — 125 psi at 70 degrees Fahrenheit, Temperature range — 0 to 140 degrees Fahrenheit
PVDF (Kynar):
KemKey™ fittings produced from 30% fiberglass filled PVDF are designed to exceed all specifications of standard cam-locking fittings. The pressure rating for PVDF is as high as 150 psi. Maximum pressure — 150 psi at 70 degrees Fahrenheit, Temperature range — 0 to 180 degrees Fahrenheit
Properties
Properties of PVDF
- wide temperature range: -40°C up to maximum 140°C . short-term, sustained
operating temperature: 95°C. - self-extinguishing according to UL 94-VO • excellent mechanical properties, i.e. high tensile and high impact strength
- light weight
- easily fabricated
- excellent insulating and electrical properties
- excellent abrasion resistance and weathering resistance
- low coefficient of friction
- excellent chemical resistance, especially with acids and solvents, even at high temperatures.
- low permeability
- non-toxic, food (FDA) approved
General properties of polypropylene
Polypropylene exhibits thermal stability up to 100°C (short- term 120°C for drainage systems).
Polypropylene also shows good impact strength, improving further along with increasing temperature.
Polypropylene is physiologically non-toxic (in accordance with ONORM B5014, Part 1, FDA, BGA, and KTW guidelines) making it ideally suited for a piping material in contact with potable water.
- Low specific weight of 0.91g/cm3.
- High long term creep resistance
- Excellent chemical resistance
- High resistance to thermal ageing
- Outstanding welding characteristics
- Excellent abrasion resistance
- Smooth internal surfaces
- Maximum operating temperature – 90 degrees C
- Minimum operating temperature – 10 degrees C
Chemical resistance
The chemical resistance of polypropylene is considered excellent. It is resistant to dilute (aqueous) solutions of salts, acids and alkalis and to a large number of organic solvents. Polypropylene is resistant to concentrated hydrochloric acid and hydrofluoric acid, however above certain concentration levels diffusion can occur. This does not damage the material itself but it can cause secondary damage to surrounding steel constructions. In this type of application, double containment piping systems have been found ideally suited.