Nylon 6/10 per L-P-410 specified on drawing. I am told that nylon 6/12 meets all the requirements. Can this be used as a direct replacement for 6/10 without customer approval

Nylon 6/10 per L-P-410 specified on drawing. I am told that nylon 6/12 meets all the requirements. Can this be used as a direct replacement for 6/10 without customer approval

Initially - I would say no - you must get approval first. But without knowing your application - it is too hard to say.

turnit,

I agree with Carol, that it is too hard to tell without knowledge of industry and contractual obligations. Review the contract to see if your customer requires notification or right to approve changes or substitutions. See if you have signed a no change agreement with them. These are especially popular when your customer is part of a regulated industry (e.g. medical device, aerospace). Even if the material in hand meets the requirements of the drawing specifications, you still may need to request authorized substitution. My example here is that a customer in a medical device arena might have the design verification records to support Nylon 6/10 but not for Nylon 6/12 (e.g. biocompatibility testing certificates). A seemingly simple substitution could have significant impact on your customer, especially if the drawing specification aren't quite what they should be.

I'd make the call to be sure. Welcome to the Cove!!:bigwave:

Regards,

Kevin

I agree with Kevin here about potential problems you may create for customer.

Flatly, "I've been told" will not suffice to convince the customer to approve. You must HELP the customer find a valid reason to approve the change - chem tests, bio tests, mechanical tests, etc. from reliable and respected source material.

Risk Assessment:
Not only do you face the rsk of customer rejection of your parts, but if you substitute and he is not aware of and approves of the substitution, you could face serious damage lawsuit down the road.

Bright side:
Customer could say, "Sure, no problem. This is not a critical material or component.

Best course of action in ALL cases:
"When in doubt, ASK the guy who has the right to make the decision!" [the customer]

I agree with Kevin here about potential problems you may create for customer.

Flatly, "I've been told" will not suffice to convince the customer to approve. You must HELP the customer find a valid reason to approve the change - chem tests, bio tests, mechanical tests, etc. from reliable and respected source material.

Risk Assessment:
Not only do you face the rsk of customer rejection of your parts, but if you substitute and he is not aware of and approves of the substitution, you could face serious damage lawsuit down the road.

Bright side:
Customer could say, "Sure, no problem. This is not a critical material or component.

Best course of action in ALL cases:
"When in doubt, ASK the guy who has the right to make the decision!" [the customer]

One more thing: get it in writing. Don't accept a telephone call or an e-mail as specifications. If the customer agrees to the substitution, have them change the drawing. If they balk at doing that, don't make the substitution.

One more thing: get it in writing. Don't accept a telephone call or an e-mail as specifications. If the customer agrees to the substitution, have them change the drawing. If they balk at doing that, don't make the substitution.This is accurate to a certain extent. Depending on time constraints, you CAN accept an email OK ("formal waiver" in legalese) with hard copy by fax or FEDEX. Electronic secure signatures are acceptable in most cases. Electronic copies of drawings are acceptable in most industries (government regulators are the sticky part.)

In aerospace, for example, "redline" changes are acceptable to FAA whenever there is an "aircraft on ground" situation because of the costs of keeping aircraft out of service. Redline changes (depending on the relationship between parties - warm and friendly or standoffish and prickly) are often handled by emailed photos of hand marked changes on drawings (the red lines!), while the formal, fully approved drawing and revision changes may take weeks, depending on the approval process at the design owner. Changes classified as "Major" still require FAA written approval before the product can be installed on an aircraft. (the definition and subsequent classification of "major versus minor" often gives Chief Engineers sleepless nights!:rolleyes:)

This is accurate to a certain extent. Depending on time constraints, you CAN accept an email OK ("formal waiver" in legalese) with hard copy by fax or FEDEX. Electronic secure signatures are acceptable in most cases. Electronic copies of drawings are acceptable in most industries (government regulators are the sticky part.)

In aerospace, for example, "redline" changes are acceptable to FAA whenever there is an "aircraft on ground" situation because of the costs of keeping aircraft out of service. Redline changes (depending on the relationship between parties - warm and friendly or standoffish and prickly) are often handled by emailed photos of hand marked changes on drawings (the red lines!), while the formal, fully approved drawing and revision changes may take weeks, depending on the approval process at the design owner. Changes classified as "Major" still require FAA written approval before the product can be installed on an aircraft. (the definition and subsequent classification of "major versus minor" often gives Chief Engineers sleepless nights!:rolleyes:)
I didn't mean for "in writing" to be taken literally, in the sense that someone must actually use a pen or pencil to write something down. http://elsmar.com/Forums/images/icons/icon8.gif I also urge people not to accept an e-mail approval under any circumstances where it's not crystal clear that the e-mailer has the authority to override the drawing requirements.