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Ordering Information
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DURACAL buffers are guaranteed to be stable for 5 years from the date of production.

Conventional pH buffers change their pH value due to air diffusion during storage and use. Duracal buffers do not change their pH value during storage or use. The unique dosing bottle allows sensor calibration in the bottle without reservoir contamination.

The addition of buffer preservatives prevents contamination by bacteria and fungi while retaining high buffer capacity for fast stable calibrations.

  • Certified traceable to N.I.S.T.
  • Easy-to-use CALPACKT dosing bottle allows sensor calibration
  • Economical since only the quantity required for calibration is dispensed from the CALPACK bottle
  • Guaranteed 5 year pH buffer lifetime
  • For automatic buffer recognition:
    simply use IEC 746/Technical Buffer
  DURACAL Buffer Solutions Photo
     
Can you trust your buffer solution?
A complete range of patented buffer solutions provides never before possible pH stability. Hamilton guarantees DURACAL pH buffers for 5 years after the date of manufacture. The pH 9,21 and pH 10.01 buffers are even stable in air. See Figure 2 below. High buffering capacity provides stable calibration. Preservatives are added to prevent microbial and mold growth.

Traceability
An important issue for the production of Certified Reference Material is to ensure the traceability through an unbroken chain of comparisons to reference material of the highest metrological quality (Primary Reference Material).

Closed Loop Traceability
Unlike other manufacturers where only a top-down traceability is applied, Hamilton is working with a circular or closed loop traceability. The closed loop traceability ensures the users of Hamilton DURACAL buffers a unique reliability.

Top-Down Traceability
At Hamilton the pH value of DURACL buffers is determined by comparison against two Secondary Reference Buffer Solutions. These are purchased from accredited suppliers for Secondary Reference Materials. The solutions themselves are compared against Primary Reference Solutions from PTB or N.I.S.T..

Bottom-Up Traceability
To ensure the highest possible accuracy and full reliability of the pH value, a representative number of samples from every single production lot are sent to a German DKD laboratory (DKD-K-06901) for an external, independent impartial verification. In this laboratory, the DURACAL samples are compared against Secondary Reference Solutions from DKD-K-06901. The Secondary Reference Solutions are of course compared against Primary Reference Solutions from PTB. At this stage the loop is closed: the PTB Primary Reference Solution is the starting and ending point of the traceability loop. DKD provides Hamilton with a calibration certificate for every DUACAL production lot.


   Traceability scheme for the determination of the pH value of DURACAL buffers.
Features
  • Convenient 250 ml and 500 ml plastic bottles with built-in calibration compartment
  • Economical, since only about 20 ml’s of buffer is used per calibration
  • Actual value is determined by a DKD laboratory, accredited for pH measurement
  • First class certificate with traceability to international standards
  • Certificates are available at www.hamiltoncompany.com/cert
  • Expiration date on the bottle
  • Immune to micro-organisms
Stability Chart
Figure 2: Stability of pH 9 buffer when subjected to prolonged exposure in air.
  
Guaranteed pH Buffer Accuracy
Figure 3: Label includes expiration date, batch number and actual value
 

ORDERING INFORMATION
pH and Redox Calibration Buffer Ordering Information

Part # Description Accuracy Stability (months) Certified by Package Size
238271 DURACAL Buffer pH 1.09 +/- 0.02 60 Hamilton 1 x 500 mL
238272 DURACAL Buffer pH 1.68 +/- 0.02 60 Hamilton 1 x 500 mL
238273 DURACAL Buffer pH 2.00 +/- 0.02 60 Hamilton 1 x 500 mL
238274 DURACAL Buffer pH 3.06 +/- 0.02 60 Hamilton 1 x 500 mL
238317 DURACAL Buffer pH 4.01 +/- 0.01 / +/-0.02 24 /60 DKD 1 x 250 mL
238217 DURACAL Buffer pH 4.01 +/- 0.01 / +/-0.02 24 /60 DKD 1 x 500 mL
238917 DURACAL Buffer pH 4.01 +/- 0.01 / +/-0.02 24 /60 DKD 3 x 500 mL
238332 DURACAL Buffer pH 4.01 +/- 0.01 / +/-0.02 24 /60 DKD 1 x 5 L
238194 DURACAL Buffer pH 4.01 +/- 0.01 / +/-0.02 24 /60 DKD 1 x 10 L
238275 DURACAL Buffer pH 5.00 +/- 0.02 60 Hamilton 1 x 500 mL
238276 DURACAL Buffer pH 6.00 +/- 0.02 60 Hamilton 1 x 500 mL
238318 DURACAL Buffer pH 7.00 +/- 0.01 / +/-0.02 24 /60 DKD 1 x 250 mL
238218 DURACAL Buffer pH 7.00 +/- 0.01 / +/-0.02 24 /60 DKD 1 x 500 mL
238918 DURACAL Buffer pH 7.00 +/- 0.01 / +/-0.02 24 /60 DKD 3 x 500 mL
238333 DURACAL Buffer pH 7.00 +/- 0.01 / +/-0.02 24 /60 DKD 1 x 5 L
238188 DURACAL Buffer pH 7.00 +/- 0.01 / +/-0.02 24 /60 DKD 1 x 10 L
238277 DURACAL Buffer pH 8.00 +/- 0.02 60 Hamilton 1 x 500 mL
238319 DURACAL Buffer pH 9.21 +/- 0.02 60 DKD 1 x 250 mL
238219 DURACAL Buffer pH 9.21 +/- 0.02 60 DKD 1 x 500 mL
238919 DURACAL Buffer pH 9.21 +/- 0.02 60 DKD 3 x 500 mL
238216 DURACAL Buffer pH 9.21 +/- 0.02 60 DKD 1 x 10 L
238321 DURACAL Buffer pH 10.01 +/- 0.02 60 DKD 1 x 250 mL
238923 DURACAL Buffer pH 10.01 +/- 0.02 60 DKD 3 x 500 mL
238187 DURACAL Buffer pH 10.01 +/- 0.02 60 DKD 1 x 10 L
238223 DURACAL Buffer pH 10.01 +/- 0.02 60 DKD 1 x 500 mL
238278 Hamilton Buffer pH 11.0* +/- 0.02 24 Hamilton 1 x 500 mL
238279 Hamilton Buffer pH 12.0* +/- 0.02 24 Hamilton 1 x 500 mL
238922 DURACAL Buffer pH 4/7/9.2 +/- 0.01 / +/-0.02 24 /60 DKD 3 x 500 mL
238924 DURACAL Buffer pH 4/7/10 +/- 0.01 / +/-0.02 24 /60 DKD 3 x 500 mL
238228 Redox Buffer +271 mV +/- 5 mV 24 None 1 x 500 mL
238322 Redox Buffer +475 mV +/- 5 mV 24 None 1 x 250 mL
238227 Redox Buffer +475 mV +/- 5 mV 24 None 1 x 500 mL
          * Indicates only 2 year stability
 
 



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