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Service. Performance. Quality.

Karl Hecht glassware factory

Our service for you

Do you have questions about our products or would you like to know what other services we can offer you? Or are you looking for the technical data of our materials? Here you will find all the information and details about our plastics and glass products in combination with various chemicals and different temperatures. Our FAQs are sure to answer many of your questions!

Repair & return

We are happy to carry out repairs on your defective devices. However, the affected devices should be cleaned, sterilized and – if necessary – decontaminated beforehand. The repair should also be economically viable. As the safety of our employees and responsible action are important to us, we reserve the right to request a clearance certificate (decontamination declaration).

Complaints

In the event of a complaint, the goods should be returned to us unused and securely packed in the original sealed packaging. This does not apply to custom-made products, as these are not generally available items. To enable us to process your claim as quickly as possible, we ask you to provide detailed information about the fault found. You are welcome to use our contact form or contact us directly by phone or e-mail – our staff will deal with your request immediately.

Technical data

Glass qualities

Type of glass Linear thermal expansion coefficient alpha (20°C; 300°C) DIN ISO 7991 Transformation temperature Water resistance Acid class Caustic class
AR-Glass® 9.1 – 10-6 K-1 525 °C 3 1 2
DURAN® 3.3 – 10-6 K-1 525 °C 1 1 2
FIOLAX® 4.9 – 10-6 K-1 565 °C 1 1 2

AR-Glas® = soda glass
DURAN® = borosilicate glass
FIOLAX® = borosilicate glass

Plastic resistance to solvents:

Abbreviation Name Alcohol Aldehydes Lye Ester Ether Hydrocarbons Ketones
EPDM Ethylene propylene diene rubber + + ++ ++ 0 ++ ++
ETFE Ethylene tetrafluoroethylene copolymer ++ ++ ++ ++ ++ ++ +
FEP Tetrafluoroethylene-hexafluoropropylene copolymer ++ ++ ++ ++ ++ ++ ++
MF Melamine-formaldehyde resin ++ 0 0 0 0
PBT Polybutylene terephthalate ++ ++ + + ++ + +
PC Polycarbonate + 0 0 ++ 0 0 0
PE Polyethylene + + ++ + 0 0 +
POM Polyoxymethylene + + + 0 + + +
PP Polypropylene + + + + 0 + +
PS Polystyrene 0 0 + + 0 0 0
PTFE Polytetrafluoroethylene ++ ++ ++ ++ ++ ++ ++
PVC Polyvinyl chloride + 0 ++ + 0 0 0
SAN Styrene-acrylonitrile copolymer 0 0 + ++ 0 + 0
UF Urea-formaldehyde resin (urea molding compound) ++ ++ 0 ++ ++ ++ ++

++ = very good resistance
+ = good resistance
o = little to no resistance

Heat resistance of plastics and sterilization options:

Abbreviation Product name Heat resistance in °C (continuous) Sterilization
EPDM Ethylene propylene diene rubber -45 to +150 +
ETFE Ethylene tetrafluoroethylene copolymer -100 to +150 ++
FEP Tetrafluoroethylene-hexafluoropropylene copolymer -200 to +205 ++
MF Melamine-formaldehyde resin -35 to +80
PBT Polybutylene terephthalate -40 to +60 ++
PC polycarbonate -45 to +180 0
PE polyethylene -135 to +135 +
POM Polyoxymethylene

PE-LD -50 to +80

PE-HD -100 to +90

+
PP Polypropylene -40 to +85 +
PS Polystyrene -40 to +110 0
PTFE Polytetrafluoroethylene -10 to +70 ++
PVC Polyvinyl chloride -10 to +70 0
Column 1 Value 13 Column 2 Value 13 Column 3 Value 13 Column 4 Value 13
Column 1 Value 14 Column 2 Value 14 Column 3 Value 14 Column 4 Value 14
Column 1 Value 15 Column 2 Value 15 Column 3 Value 15 Column 4 Value 15
Column 1 Value 16 Column 2 Value 16 Column 3 Value 16 Column 4 Value 16

A = autoclavable at +121 °C
B = beta/gamme radiation 25 kGy
C = chemical (formalin, ethanol)
D = gas (ethylene oxide)